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Undertale Psi is an alternate universe of Undertale created by Zeno Dreemurr on March 26, 2019, shared via the medium of a written story. It is a Multiversal AU that sets the beginning of its story to happen one month after Aether and Erebus discovered their father was killed in Xéno!Frisk's arrival, the last special story of Xénotale in chronological order in-multiverse. The AU follows the path of Zeno's organization to attain their goal of balancing creation, protection, and destruction in the Multiverse. It also expands on the Multiverse, AUs, and characters shown in Xénotale.
Characters[]
Undertale Characters[]
Frisk[]
The human that falls in the Underground in Undertale. They kill every monster and fights Sans at the end, but dies.
Asgore[]
The king of the Underground in Undertale, and guardian of the six souls. He used to try to free the monsters but due to a recent slaughter, he abandons the idea, instead giving Sans the souls.
Monster Kid[]
Monster Kid is a Monster that lives in the Snowdin town. He is mentioned from time to time during the fight between Celerity!Sans and the Astral Mother. The Astral Mother kills him during the fight.
Added Characters[]
Celerity!Sans[]
Main article: Celerity!Sans
The protagonist of Undertale Psi. He is a Sans from an AU called Xénotale. He is the second in command of Zeno's organization, its main fighter, and its fake leader. He usually acts like a protector of the AUs at the beginning, though he is not a member of the group that uses this name at this point of the story. The protectors of the AUs usually get his help, often because they ask for it, though it is to avoid him sometimes. He also destroys AUs, though it is very rare. He investigates about the mystery of the destruction of an AU called Arttale, helped by his relationships. He also investigates about Ink!Sans's past, discovering what it contains in the end. He tells Alpha!Sans about Ink!Sans's past, just after fighting Aether and Erebus, as well as introducing Opposite!Sans to Error404!Sans. Since he is new to the Multiversal scene, he learns many things over the story. He also shows himself to be incompetent with normal runs of an AU, and when he realizes it, he becomes more emotional.
During the aftermath of the game of death, he becomes an official protector of the AUs. However, he still hides his relationship with his Papyrus and his Frisk, since they are infamous in the Multiverse. When he rests, he usually does so in Outertale, where he either looks at the stars or eats in the Grillby's of this AU. He also likes to visit AUs, especially when it is for the first time, and has a passion for physics, reading many physics books, helped by his perfect memory. He does not care whether someone is classified as a protector, a destroyer, or anything in-between as long as he can get along with this person, and that they are not too much of a threat for the Multiverse, sometimes becoming friends with possible destroyers. He also loves fighting, and uses the Arena as a way to fight his friends without threatening their life. He is a very sympathetic and altruistic, reading to sacrifice himself for others if he believes it is the right thing to do.
When Alpha!Sans dies and Pandora!Ink confirms it, he becomes sadder and angrier. He wants to exterminate the traitor at all costs, he becomes less sympathetic, begins to hesitate about his acts, yet doesn't forget his duties. It is a very painful moment for him, even believing from time to time that it's his fault if Alpha!Sans died, and also leading him to leave Zeno's organization. He then goes even further, joining Infected's cult and giving the impression of betraying the entire Multiverse for his own selfish goals. In truth, his acts in Infected's cult only show that he is incapable of going against his good nature, though he can show himself to be more blunt, harsh, or deceptive than usual. Even when he gets the occasion to get the revenge he always wanted on his Papyrus and his Frisk, he gives up on it when he believes he should thank them. During this time, he gets a change in appearance. When he finally gets Alpha!Sans to be resurrected, however, he finally joins the protectors back, helping them to not fall under the Astral Mother's control and becoming the leader of the protectors. At this moment, he also explains what he has been doing outside of his protector duties.
He is still affected by his past, his brother's treatment of him and Xéno!Frisk's eidocide. He is implied to be in love with someone.
Infected!Sans[]
Infected!Sans is a destroyer of the AUs that existed back at the time of Alphatale, though he didn't have the capability to travel through AUs without destroying them as he does know. Error404!Sans tries to destroy the statue he becomes when he dies, failing to do so. He is the leader of the Infected cult, a group that wants to destroy all of the AUs and has a lot of knowledge on the past of the Multiverse, yet has difficulty to keep up with the news. Infected often labels AUs and inhabitants of the Multiverse as ugly, and he holds a lot of hate towards Error404!Sans, Celerity!Sans, and the protectors.
His true reason for destroying all AUs is the extreme amount of colors inside most of them, since he is almost incapable of bearing the existence of colors, which is why he does not destroy blank universes. It also means that he does not kill people that are colorless unless they are his direct enemies. However, even though he tends to kill people that are colorless, he can accept the idea of them being alive as long as there is a good reason for it, which helped him form Infected's cult more efficiently.
Alpha!Sans[]
Alpha!Sans is a Sans of Alphatale, and a member as well as the true leader of the protectors of the AUs. During the very beginning of the story, he is convinced by Zeno's logic explanation of his goal, which is what brings him to join Zeno's organization, along with his friendship with Celerity. Until Celerity explains Ink!Sans's past, he is a good friend of Ink, though he gets disappointed by Ink!Sans's way of covering his past.
He can get information pretty easily about multiple groups in a short amount of time, and is not known by many destroyers, while being a good fighter, making him commonly seen as an excellent member of the protectors among the protectors themselves. Unless the person can become a protector, whenever someone discovers about his existence, he makes sure that they forget about it. However, when his existence is discovered by the others Out!Codes in the Multiverse, he stops erasing memories and just accepts that everyone knows of him. He begins to present himself as the leader of the protectors. This makes him meet his brother, Error404, again.
Unfortunately, he meets him doom in Infinitetale, while fighting Pandora!Ink and trying to understand what he plans. He panics before he is revealed the final detail about Pandora!Ink's acts, and dies just after. After his death, he is resurrected by Zeno, but becomes incapable of escaping Xénotale.
Zeno[]
Main article: Zeno
A mysterious being from an AU he called himself Undertale: The Ultimate Timeline. He is the leader of Zeno's organization, who has the goal of balancing creation, protection and destruction in the Multiverse. However, the story implies that he has another goal. He wants to do so by causing events that are supposed to lead to this balance. He has an extreme liking of Charas, almost distracting him from his goals. He does not often act directly, usually acting by talking with the members of his organization and Error404!Sans instead. He sometimes visits AUs, though he rarely shows himself inside them. However, he is very friendly and kind with the people he interacts with, sometimes becoming their friend. If necessary, he talks in an incredibly polite manner for business in these AUs, though he dislikes exaggerating his politeness.
He most often spends his time leading his organization, being with Souls, or having multiple kinds of interactions with Choco. He also develops a great bond with Psyka. Though, even with the people he likes the most, he rarely talks of his past life, but may talk about the way he thinks. Even though he gives orders for it, Zeno hates to order for deaths and destructions. He wants to make the Multiverse better, yet regrets some of his actions. Regardless of what he does to reassure himself, he never feels better about his actions. Even though he forms bonds throughout the story, he still does not touch anyone, even if the people among those he likes most ask him to, out of a fear he calls most likely irrational. He also reveals he partially recruited Celerity for his good nature, liking people such as him.
When Krasmein calls him a coward and when Celerity makes him feel better, as well as reassures him, he eventually gets back to touching people and shows himself to be a greatly affectionate person. He shows his true form and tells parts of his past to his organization as well. Generally, when he is confronted with his bad acts, he actually feels very badly about them, as he loves good acts and despises some of the acts he does himself. Depending on how extreme it may be, he may just not retort or even cry, though the latter happens only in extreme cases that can get him to be very emotional. He also follows a strict code of conduct when it comes to using his powers.
Xéno!Papyrus[]
Xéno!Papyrus is the Papyrus of Xénotale, and a member of Zeno's organization. He first acts by fighting Great!Mettaton and Great!Asriel, getting harmed in the process. He is a person to like having missions, and that hates sleeping, waking up as soon as possible. Though he likes missions, he does not like the idea of dying to difficult ones. He is very bad at cooking, and due to this, decided that he should give up the idea of cooking. He gets Broomie, given by Zeno to him after Ink abandons it.
He nearly gives up on working for Zeno when he discovers the truth about Celerity!Sans, the creation of Xénotale, and the nature of the organization. Having recognized his wrongdoings with his brother and the people around him, while still being selfish, it makes him think about his acts. He reveals that he does not care about others suffering if it can bring him joy but does not desire such suffering. He still shows a sense of justice, even though he likes to abuse it.
Xéno!Frisk[]
Xéno!Frisk is the Frisk of Xénotale, and a member of Zeno's organization. She first acts by fighting Great!Mettaton and Great!Asriel, though she does believe in the fight that she can not do many things due to her lack of magic, especially against people that she can't attain with physical attacks. She is very harsh when she talks to people she dislikes, but acts normally with people she likes being around. She misses the capability to see well the time flow, but likes to have missions. Much like Xéno!Papyrus, she dislikes the idea of dying during missions.
She nearly gives up on working for Zeno when she discovers the truth about Celerity!Sans, the creation of Xénotale, and the nature of the organization. While she is still selfish and continues to criticize Celerity, she also starts to criticize Zeno, even though she knows he wants to do good.
Ultimate Timeline!Asriel[]
Main article: Ultimate Timeline!Asriel
The king of the monsters in Undertale: The Ultimate Timeline. He is a caring king that treats his subordinates well. Zeno got an audience with him, and is told by Zeno that they will not see each-other for a while.
Ultimate Timeline!Gaster[]
One of the two royal scientists in Undertale: The Ultimate Timeline. He is given the screen by Zeno, and watches over the events of the Multiverse thanks to it. He also watches over Celerity!Sans and Zeno from time to time.
G[]
The leader of G's order. He originates from Greattale and survived its destruction, then arrived in the Cursed Void. Despite having Out!Codes in his order, he can't escape his anti-void for reasons unknown to him and his order, though he eventually escapes soon after Infected's attack on the protectors. He activetly seeks to get Opposite back, often asking his minions to bring him back. His true goal is to find out how powerful magic can be and how powerful inhabitants of the Multiverse can become.
As he eventually escapes the Cursed Void, he discovers more of the Multiverse and becomes more active as an Out!Code, doing experiments on multiple AUs, that also serve as a training for Great!Sans, and that also serve to get a new member for his order. When Great!Sans leaves his organization, he gets very upset and wants his death. Eventually, though, he makes a deal with Démolition!Sans to help him destroy Infected's cult, in exchange of making his organization more powerful.
He shows himself to be very manipulative and good with words, as he helps the protectors just to not be a target for them.
Great!Sans[]
A member of G's order. While he obeys G, he hates being in G's order and would like its downfall, yet does not actively tries since it is a difficult and very risky task. However, he still gets surprised that G can escape the Cursed Void, and wonders whether it is a good or a bad thing for him. He then later follows G when the latter wants to train him in Outertale, and respects G's demands.
His past in Greattale resurfaces when he approaches Sangtale. From the memories of his past with Dunamiz to the realization that his brother Greaty is alive, he becomes overloaded with thoughts and hesitations, which eventually leads up to him resigning from his duties in G's order, yet keeps contact with Pseudo-Eido!Sans.
He is a huge fan of Celerity!Sans and wishes to become like him. His idealization of Celerity, that started when the Sans beat him and won the Multiversal Sans tournament, made it very hard to for him to believe that Celerity!Sans had turned bad.
Erebus[]
One of the two leaders of the cult of Chaos. During the story, he convinces G not to kill the members of G's order he controls. He seeks vengeance for his father. Thanks to his minions, he gets more powers during the story, though he loses them when he loses the control of the persons or if the persons he takes the powers of dies. He does not mind alliances, and would ally with anyone as long as it helps him get revenge.
Great!Mettaton[]
A former member of G's order, sent to find Great!Asriel by G, only to be controlled by Aether and Erebus. He temporarily works for the cult of Chaos. He dies while fighting for the cult of Chaos, killed by Xéno!Frisk. When he does so, G resurrects him and gets his control of Great!Mettaton back. Great!Mettaton then works as a perfect soldier for G, helping him for almost every type of task.
Great!Asriel[]
A member of G's order, that temporarily works for the cult of Chaos. He dies while fighting for the cult of Chaos, killed by Xéno!Frisk, long before Great!Mettaton dies. When he resurrects, he gets back into G's order.
Aether[]
One of the two leaders of the cult of Chaos. He makes up a plan with his brother Erebus to accomplish his vengeance for his father. Thanks to his minions, he gets more powers during the story, though he loses them when he loses the control of the persons or if the persons he takes the powers of dies. He does not mind alliances, and would ally with anyone as long as it helps him get revenge.
King Multiverse!Sans[]
The self-proclaimed king of the Multiverse, and king of gods, often called King, a nickname he hates. He is a watcher most of the time, watching over the cult of Chaos and G's order. He seeks to kill Error404, and to do do, he tries to recruit an alliance made of powerful beings that can fight 404's organization and Error404 himself, while making sure that Error404 doesn't discover it. The reason he does this is because he has been jealous of his master for all of his life and wants to get his place, so he can get respect and the true role of a king of the Multiverse. He eventually dies, killed by one of his former servants.
Error404!Sans[]
Main article: Error404!Sans
A Sans from an AU called Alphatale and the bother of Alpha!Sans. He destroyed his origin AU himself and is devastated by it. He is the self-proclaimed god of the Multiverse, above King Multiverse. He leads an organization that contains a lot of destroyers and murderers, though he may protect universes in extremely rare cases. According to Zeno, he killed Chaos. One of his goals is to find a way to destroy Infected's statue to kill him definitely, and he often experiments on it. He did so many experiments that he hardly finds new ones. His other goal is to balance protection and destruction in the Multiverse to prevent it from collapsing on itself, and to do it, he controls the destroyers as well as a few other minions. Even though he actually hates destroying, destruction in general, and the suffering it causes, he does it because he knows he has no other choice to help the Multiverse keep existing. He is sometimes curious, but fears the Fresh parasite of the snow.
Sometimes, he acts like a businessman, having deals on multiple occasions, as long as he gets advantages, even if it affects his organization. While he does not mistreat the other members of the organization, he lets the members of the organization mistreat each-other. He also shows no trust and even disgust towards the members of the organization besides NewLie. He is often seen as wise and often tries to take the right decisions at the right moment. While he is the leader of a group of destroyers, he does not have any harmful intents towards the protectors and even shows himself to be calm around them as long as nobody talks about a sensitive subject. He also states that they are more useful alive than dead.
When he learns that his brother is still alive, he starts to have a breakdown, first not believing it while yelling at his minions, second admitting that he wishes it is true while not believing it is. He believes that his brother would be disappointed to know what he became. He eventually calms down, waiting to try to figure out whether it is true or not. Eventually, as Celerity confirms it, he decides to find a way to contact his brother again. He is ready to sacrifice everything to get his brother back, even his own organization. He eventually gets into contact with his brother again. However, his brother soon dies. When it happens, he avoids being around people in a desperate manner, becoming very rude to the people he does not very well. He, however, is convinced to help by NewLie and does so from time to time.
He has the greatest hatred to exist towards his mother and a Sans named Omnipotent!Sans, and she is the only person that he never changes his behavior towards, regardless of how he feels, being hostile at every occasion when she is present.
Error!Sans[]
A very well-known destroyer of the AUs, working for Error404!Sans from time to time, though he does destructions by his own will as well. He makes sure to hide any knowledge related to Error404's organization. His past still haunts him, and he is quite envious of Error404's powers. He is not very smart, though he has good knowledge on the Multiverse, allowing him to escape difficult situations if it is necessary, or to give advices to Error!Asgore, his apprentice. He can be manipulative as well, to the point where he does what he hates to do to manipulate someone. He does not hesitate to make alliances with the protectors if it is necessary, though he prefers to not do so.
Not only he works for Error404!Sans, but for King Multiverse!Sans as well, and feared that he does something to replace the leader of the protectors if Ink!Sans were to be killed, as it could be a stronger one. He fears this less thanks to Error!Asgore, and now wants to kill every replacement Ink!Sans will have if he dies with Error!Asgore's help, unless the replacement is Blueberror. He begins to work for Celerity!Sans later on, to be protected from Ink's wrath, though he strongly dislikes having to work for him, and strongly hates the discoveries he made about Celerity because of this. Because of this, he can not destroy AUs anymore, and usually stays in his bedroom.
He later discovers that Celerity!Sans himself working for a child named Zeno and tries to leave the organization when Celerity does so. He quickly gets convinced by Zeno's power and arguments that he should stay in the organization.
He returns when the Eye comes back in Undertale, making sure to defend the original universe, even if it means allying with the protectors. He also returns when Celerity betrays Zeno's organization for one Outertale meeting.
DT!Alphys[]
The Alphys of Determinatale, who created artificial DT to be injected into monsters, with success. She is confident in herself due to this, though she is worried about Asgore. She always believed in alternate universe. She is very happy when she is confirmed by Error that other universes exist.
Error!Asgore[]
The king of the monsters in Determinatale. He is depressed since the Barrier is nowhere near to be broken. He is not very active as a king and does not like that the humans came back to life.
This is before Error!Sans comes in, brings him in the anti-void 6 and manipulates his thoughts so the anti-void 6 corrupts him and makes his new feelings go the extreme. He is incredibly hateful towards everyone with the exception of Error!Sans, though he later accepts the existence of Error404's organization. They make a team together to destroy all of the AUs, though he is new in the work. He has difficulties to team with people other than Error!Sans, and may fight anyone that is not Error!Sans unless they are a temporary ally.
Since Error!Sans is transferred to Zeno's organization, Error!Asgore temporarily trains under Error404!Sans, who wants to help him to destroy AUs. Thanks to his training, Error!Asgore discovers that he has the ability to absorb AUs, though he does not master it.
DT!Sans[]
The Sans of Determinatale. He gets killed by Papyrus, but revives. He does not hesitate to counter-attack. When Error!Sans returns later on, he is under The Voice's control, teaming with DT!Papyrus.
DT!Papyrus[]
The Papyrus of Determinatale, who seeks to enter in the royal guard. However, The Voice takes full control over him. That makes him kill Sans. The Voice still fakes to be him later on, though he teams up with DT!Sans.
The Voice[]
A voice that can control beings with determination in them. It uses Determinatale as headquarters, though it is active in the Multiverse.
Pandora!Ink[]
At the beginning of the story, he is the official leader of the protectors of the AUs, just known as Ink!Sans at that point. With the exception of himself, nobody has known of his past for a long time, though he was the one to establish the organization that is the protectors of the AUs. He always made sure that nobody discovered his past by making sure anyone who was curious about him as a threat to the Multiverse, though it changes after his past is discovered by the protectors. One of the key components of his deception as Ink!Sans is to create another character entirely, mostly with unstable emotions and memory losses. He also works alone from time to time, working on his theories. He discovers that Celerity!Sans, The Voice, Xéno!Papyrus and Xéno!Frisk originate from the same AU while observing them fighting Aether and Erebus.
He eventually admits that he originates from blank universe 16253, though he also uses the name Blanktale to call it. He escaped this universe to end in Arttale, getting Broomie from the Gaster of that universe. He then made sure that the AU would be destroyed before covering up his past until it gets discovered by Celerity!Sans. He later expands on the truth, stating that he gets bored quickly of everything he discovers in the Multiverse, and that due to this, he always try to find something new.
He eventually comes back as Pandora!Ink, working for a woman of unknown identity, killing King Multiverse as his first act. He also recruits for this woman, though she does not ask for it. He then frees Prunsel to destroy Undertale and to kill every Out!Code in the AU party, and proclaims himself to be the god of Evil, though he actually never wishes to destroy AUs, instead desiring to preserve them. He shows himself to love spectacles and mass murders, yet only seems to murder himself when necessary. He is also very sadistic.
Just before he kills Alpha!Sans, he gives his victim many informations, mentioning that he has a new soul, but also detailing his end goal: Causing a perpetual Multiversal war that will include every AU in it, by controlling the Multiversal culture, and he wants to make sure to eternally enjoy it.
Blueberror[]
He is a protector of the AUs, and a friend of Error!Sans. Error!Sans states that he refused to join him, but he does so by fear of Ink!Sans alone. He deeply wants to spend more time with Error!Sans. He has an extreme fear of a group of spiders, since End!Muffet almost ate him during the past, to the point where he is near incapable of doing anything near a Muffet that isn't in its own universe.
As the story progresses, he also shows himself to abandon the former standards of the protectors. He also shows how benevolent he is, trying to help Timekid!Sans with his inner struggles and deciding to trust Celerity!Sans a bit even after he is proven to have had a secret life.
Timekid!Sans[]
He is a protector of the AUs. In contrary of what his name may make people believe, he is a serious person that takes his work as a protector very seriously. He believes the jobs should be shared equally. He also is a spy that is very good at gathering and understanding informations. He usually is the one to make up plans for the protectors. Timekid is a person that likes to read and is known for this. He states that he prefers physics books.
The more the story progresses, the less he trusts Celerity!Sans, but still sees him as an ally for a while, as he thinks Celerity doesn't have a bad intent, even though he turns out to think of him as an enemy when he destroys Axetale. They team up alone together for the first when searching the invite for the AU party, where he shows his knowledge of AUs. During the search, Timekid!Sans finally reveals that he actually never liked all of the principles of the protectors, and that he is okay with AU destruction on specific occurrences, but that he was too scared of revealing it. He also wishes that he could destroy AUs to mercy-kill them. Even then, when they have to take the decision of whether or not to destroy on the AU, he is very hesitant on choosing whether to hold the previous standards of the protectors or to consider the wishes of the inhabitants first, then decides that the wishes of the inhabitants of the AU should count first. He usually teams up with Blueberror, as they are a great team during fights.
The truth is, Ink!Sans had a great influence on him, almost brainwashing him. He realizes it and wishes to change it, but has a lot of trouble doing so, having a hard time accepting changes even if he believes they're good due to the standards he is used to. As much as he wishes to change, his internal struggles prevent him to do it for a while, to the point where he starts lacking confidence in himself as a protector and asks for help to change.
Ink!Alphys[]
Ink!Alphys is a curious person, investigating about everything she can investigate about in the Multiverse. She mostly works with devices that allow her to travel where she wants in the Multiverse. Due to her curiosity, she often comes steal the informations the protectors have. She is serious and is good at analyzing, making her one of Ink!Sans's most hated persons. In the story, she reads a folder about The Eye, which details a yet to be revealed event related to an eye. After reading it, she investigates about how a universe known as Corrupted Justice turned from coded to codeless. When she does this, she learns of Ink's true intentions through Celerity's words. She often is a very calm person, and rarely ever gets out of her calm state, though does not hesitate to bash people that have an opinion she strongly disagrees with. She prefers AUs that take a lot of time to be fully explained.
She says that herself and the Showmaster originate from the same AU, and that she casted him in the Multiverse, indirectly allowing him to make his current shows. However, it allows her to know of his shows and of the rules of it, abusing these to stop him.
She later reveals herself to be suspicious of Celerity, and looking for his origin AU, even though she doesn't dislike him. She has the goal to discover why the ongoing events are happening. She eventually finds two AUs she is incapable of entering even in the pencil, suspecting one of them to be Celerity's origin AU. She also suspects that Celerity is related to The Voice, Xéno!Papyrus, and Xéno!Frisk. When Celerity!Sans destroys Axetale, she is the one to see it, start to get the protectors against him and reveal her suspicions.
DT!Undyne[]
The Undyne of Determinatale. Compared to most other monsters in the AU, she can die, though it is after resurrecting at least once.
DT!Napstablook[]
The Napstablook of Determinatale. Since The Voice has taken over the AU, he is a member of the resistance, since he has no détermination. He almost never talks.
DT!Mad Dummy[]
The Mad Dummy of Determinatale. Female, she is angry most of the time she talks. She teams with her cousins DT!Napstablook and DT!Mettaton as a member of the resistance.
DT!Mettaton[]
The Mettaton of Determinatale. He is a member of the resistance. He is the one talking the most often among the members of the resistance. He usually is inside his robot body, though he abandons and hides it to enter their base.
Opposite!Sans[]
A Sans of unknown origins for a big part of the story, that G's order is seeking. He starts off as a member of the cult of Chaos. During the first fight against the cult of Chaos, he gets out of Aether and Erebus's control, then is sent in a blank universe. Since he keeps his memories from being controlled, he knows that Celerity!Sans teams with Xéno!Papyrus and Xéno!Frisk, though he becomes a member of 404's organization soon after, convinced by Error404!Sans very quickly. He is the highest-ranked member of 404's organization. He currently is trying to gather a few Out!Codes to be part of a team that studies the AUs.
He eventually tells Celerity and his teammates that he is G's son, that, due to experiments, decided to flee the Cursed Void. Later on, he also reveals that the ghost of the Gaster of Greattale, follows him at all time, and that he also is Great!Sans's nephew.
Xéno!Chara[]
Main article: Xéno!Chara
The Chara of Xénotale, who inhabits a house made for her in the Void of the sixth eidocide timeline of Xénotale. She lives alone, sometimes visited by Zeno. She spends her time reading books from various AUs.
CJ!Alphys[]
The Alphys from Corrupted Justice. She lives in her house in the ruins of her AU. She is shy and not confident. She also rarely fights other people. However, she is smart. She is identified to be CJ!Chara's mother and the former royal scientist. Until she discovers about the existence of other universes, it is known that she only used to believe in it.
She reveals later on that she adopted Chara just to use her as a weapon to exterminate all of monsterkind, treating her as an insufferable abomination when she tells her, eventuallt trying to kill her, though the Showmaster reveals later on that she said and did all of this because he mind controlled her. She dies by trying it.
CJ!Chara[]
The Chara of Corrupted Justice. She lives with Alphys in her house in the ruins of her AU, in which she has extreme trust. In contrary to CJ!Alphys, she is confident in herself yet often sarcastic. She does not like people that are way too blunt. She is a person that can be very violent in her killing. After the game of death takes over the entirety of Corrupted Justice, she gives herself the quest to save monsterkind by killing the participants of the game of death while not knowing the game of death, influenced by the Showmaster. After discovering that the Showmaster was mind controlling the monsters and that she was herself under his influence, she ends her life by herself.
The Tool[]
One of three original beings that command the Showmaster. Simply describing themself as a tool with many uses, they are a skeleton that rarely acts. They believe that their duty is all that matters, and that dreams are only ephemeral thoughts. They often are scolded by one of the persons with them for showing emotions, as rare and as little as they can be. Skell reveals that they are the one that contacted him and Pandora!Ink to work for the Astral Mother.
Purity[]
Purity is an entity that originates from Puritytale and that often takes the form of an Alphys. It has the goal of destroying all source of colors in the Multiverse, including most AUs. This makes it ally with Infected as the right hand of the Infected cult, mostly using its intelligence. It is the person that decides who enters the Infected cult, making up a strategy instead of recruiting people due to their destructive power, and either makes up the plans of the cult or develops on the little details of the plans Infected makes himself. Due to its long research to find Infected, it has gathered a lot of knowledge about the Multiverse, and continues to by observing the people the Infected cult fights.
It takes the fake identity of Calibri during the AU party, with the goal of not being recognized and to get as much information as possible about many Out!Codes. It also doesn't fight Prunsel during the AU party since it is weak. Purity is mostly good at engineering, convincing, and deceiving people.
CJ!Sans[]
The Sans from Corrupted Justice. He is a good friend of Celerity, as they met three months before the story of Undertale Psi begins. He is the royal scientist in this AU, though he is lazy and has trouble with the idea of spying people with his cameras. He is in contact with both CJ!Alphys and CJ!Asriel, though the latter kills him.
The Astral Mother[]
In the first episodes, the Astral Mother appears as a mysterious woman that always wears a Void suit at all times. She is the person that recruits Pandora!Ink, Reaper!Chara, and Reaper!Flowey during the story, as well as one of the persons that commands the Showmaster to make his shows. She also is the one to give the orders for all of Pandora!Ink's actions throughout the story. She is calm, calculating her moves and that of her servants. As stated by Skell, she is also extremely powerful, and watches the whole Multiverse at all times. Her true name is Wendy Ding Gaster, and she confirms that she execrates it.
She takes a more important role after Alpha!Sans dies, showing her very existence and revealing much about herself. She is the first being to be born after the formation of the Undertale universe. She also is Error404!Sans's mother, the empress of Alphatale, and a politician obsessed with power in all of its forms. She is also a very deceptive woman that will not hesitate to take away lives to attain her goals. She also sees Celerity!Sans as huge threat for her projects and wants to eliminate him once and for all. For all these reasons, she is a major antagonist of Undertale Psi.
The Showmaster[]
The Showmaster is an alternate version of Mettaton that makes shows for some beings of unknown identity. Most of his shows are known as his games of death. To make his shows, he manipulates the mind of people and just commentate the shows. When he manipulates them, he sometimes makes them participate in a game of death, or makes up a fake personality for them. His commentary sometimes is full of lies, though the watchers know they're lies, and that he lies purely for the sake of making the show more entertaining. He also makes sure that nobody interrupts his shows via his timeline lock ability.
However, besides his shows, he sees some interest in preventing Ink!Alphys from having informations. His greatest desire is to make the greatest spectacle of the entirety of the Multiverse's history.
CJ!Asriel[]
The Asriel of Corrupted Justice. He is the main person to make shows in the AU, though his shows are the most popular ones. He is quickly manipulated by the Showmaster for his own show though, and tries to kill every inhabitant of the AU. However, during his final fight, he shows off a great hatred for all of humanity, wanting to exterminate it all, though it was made lesser by the Showmaster's mind control on him.
CJ!Undyne[]
The Undyne of Corrupted Justice, mostly referred to by Ink!Alphys as "queen Undyne Polemis". She mostly stays alone, thinking about her past, and waiting for a human to fall. She is the last person interrogated by Ink!Alphys about the turning from the AU from coded to codeless, though she does not have an answer either. She ends up being mind controlled by the Showmaster, and giving up the informations about the game of death to Ink!Alphys, before dying.
CJ!Frisk[]
The Frisk of Corrupted Justice. He is manipulated by the Showmaster to do an eidocide route. However, he quickly gets killed by CJ!Chara.
CJ!Papyrus[]
The Papyrus of Corrupted Justice is the captain of the royal guard in this AU. He tries to help Ink!Alphys and Celerity to stop the Showmaster by attracting him into watching his fight against CJ!Asriel. He both fails and dies. He has a parasite in his mind that can influence his personality from time to time, mostly when he thinks about his brother.
The parasite[]
The parasite is a being that grew inside Papyrus's mind, that often changes his personality, slightly or almost entirely. It is more often a slight alteration of his personality that represses his desire to not kill, but it can also change his personality to a point where he becomes violent and agressive, mostly when he is at his weakest mentally.
Skell[]
Skell, is one of the three people that watch the Showmaster's shows in an anti-void. Though he uses this role for the first time during the story, he is also the champion from the games of death, a very powerful individual that is confirmed to be capable of killing the Showmaster with ease. However, he does not do so for personal interests that also push him to be the champion, since he does not like to have this role. He is very confident in his abilities when he is in his origin AU, and even over persons from his origin AU state that he is very strong.
His goal is to beat a Sans named Overcorrupt, an anomaly originating from his AU, Upsilontale, as it may cause damage to entire other AUs, though the reason he allies with the Showmaster is unknown. He also protects Upsilontale when he needs to, and is told when Upsilontale is in danger. In Upsilontale, he has completely mastery over the environment of the AU, and masters the timelines as well, allowing him to do almost anything he wants in it, and to resurrect people when they die. He can't directly affect other Out!Codes in his universe.
Skell reveals that he works for a woman because she can easily kill him, and because she helps him more than he helps her. He only talks about her when she is forced and never mentions her name, home, or goal, as she may kill him for this. He later tells his allies that his true goal is to separate Upsilontale from the rest of the Multiverse.
Killer!Sans[]
Killer!Sans is a member of Error404's organization, that serves as an inspector of Icetale during his first appearance. Though he is mostly known for killing almost anyone on his path, he is forced to not kill anyone in Icetale unless they are an Out!Code. He is the one to call for Cream to help them.
Frostscreen!Sans[]
Frostscreen!Sans is one of the variations of Sans in Icetale. He serves as the overseer of the AU, hiding in his cave. He is very agressive and is incapable of talking, but wants to protect the others. He is still good at writing, which is his main way of communication. He has made a pact with Error404 to get his AU protected in exchange of giving him information.
Later on, he begins to try to control his anger.
Infinite!Muffet[]
She is the Muffet of a universe called Infinitetale, and a member of a group of spiders that invade AUs and recruit other spiders. She is in a mission to recruit Ice!Muffet then to get the AU to be "eaten". She is a recent recruit that was saved from an explosion in her origin universe. She says that being part of the group of spiders gave her life an actual purpose.
Ice!Muffet[]
The Muffet of Icetale, recruited by an unknown being in an unknown group, in exchange of saving her and Ice!Frisk's life, Ice!Frisk being her boyfriend. With the help of the unknown person, she tries to trick Ice!Frisk into joining them. She eventually joins the group, forced by Infinite!Muffet.
Cream[]
Cream is a variation of the Sans of Icetale from a specific timeline. Due to that, he was special enough for an inspection to happen and to get noticed by Frostscreen, which is why he knows of the existence of the Multiverse as well as Frostscreen's. He is called to find Xéno!Papyrus and Xéno!Frisk, but helps the situation to be clear for everyone, until he gets parasited.
Ice!Papyrus[]
The Papyrus of Icetale is a serious Papyrus, though he is one of the kindest and most calm ones, even enjoying his brother's puns. He lives with his brother and Katelyn in Snowdin. He is a member of Ice!Frisk's group to free Ice!Muffet.
Ice!Sans[]
The normal Sans of Icetale is a kind and calm person, even in fights. He lives with his brother and Katelyn in Snowdin. He is a member of Ice!Frisk's group to free Ice!Muffet.
Ice!Chara[]
The Chara of Icetale is also Ice!Frisk's sister. She lives with her brother inside the Underground, and fell at the same time as him. She does not live with Sans, Papyrus and Katelyn though. She is a member of Ice!Frisk's group to free Ice!Muffet.
Ice!Frisk[]
The Frisk of Icetale, which is Ice!Muffet's boyfriend. He receives a letter explaining she has been abducted, and then forms a group to free her. After getting trapped with his friends, he gets freed to be abducted by the Muffets. He eventually gets forced by Infinite!Muffet to stay captive in the headquarters of the group, not killed only to force Ice!Muffet to be with them.
Katelyn Turner[]
Katelyn Turner is an added human in Icetale, adopted as a sister by Sans and Papyrus, and who lives with them. She's also Chara's girlfriend, much to Frisk's displeasance. Due to this, her and Frisk hate each-other, but she still is a member of Ice!Frisk's group to free Ice!Muffet.
The Fresh parasite of the snow[]
The Fresh parasite of the snow, also shortened as only Fresh, is a parasite that takes control of people. He is an enemy of Frostscreen!Sans, as well as the entirety of Error404's organization. When he parasites someone, he uses a seductive personality, though he can be serious from time to time. He parasites Cream to become Fresh_Cream and tries to inform Frostscreen about the ongoing events, yet is rejected and decides to leave them to their demise.
Ice!Asriel[]
In Icetale, Asriel is the caretaker of the ruins. He gets eaten by a group of spiders not long after appearing.
Syno!Sans[]
Syno!Sans is a Sans that originates from an AU called Beforetale, but who got kicked out of his AU by the AU itself. He lives in a place unknown to the protectors that he does not want to reveal. Though he does not know it, he works for Error404!Sans. He is a common guest of the Outertale meetings, and the one who most often makes puns during them.
His sworn enemy is Before!Chara, the Chara of his origin AU, that he has seen destroying all Monsters. However, even though he wants to destroy her, he has not forgotten who he truly is.
Souls[]
Souls is the leader of the Trouble Troup, a group that causes troubles in AUs. He originates from an AU known as Soulstale, where his castle, Kastel-Souls is located. He can easily get bored, which is what he fights against regardless of the mean. He also often complains about his boredom. He is an alchemist and a scientist whose main subject of study is the souls, and is incredibly knowledgeable about this. He usually works alone inside his laboratory, yet wants to work with Zeno. He hates to be judged on his height. He also does not like the protectors due to their views about the Multiverse, which he considers outdated. However, he likes to be known as a threat, and likes it more the better it is. He also hates arrogant people, and often degrades people that he believes think of themselves too highly. He also hates when events get out of his control.
While he rarely directly shows his affection, except to Neg, he keeps his word and helps the members of the Trouble Troup a lot. He sometimes insults the members of his Trouble Troup, especially Nashi, or shows that he does not like listening to them. He especially loathes Before!Chara.
The Riverperson of the Multiverse[]
The Riverperson of the Multiverse is a mysterious ally of Souls, who uses a Void suit to look like a Riverperson. He sometimes helps Souls by giving him informations or souls to study. He states that he has his own goals to achieve, though they are unknown at this time. As of now, the Riverperson of the Multiverse has abandoned this identity, and states that its true identity will be revealed the next time it appears.
Nashi Mausku[]
A member of the Trouble Troup known to be its second in command. He is Souls's son as well. This makes him an admirer of his father, incredibly loyal to him even though he has a soul of deceit. He takes care of the DNA reserves of the Trouble Troup. He is described as an expert of the masks, yet is a child. Since he is a child, he lacks patience and good judgement. However, he is still very intelligent, being capable of participating in complex, long plans.
P4142!Grillby[]
The Grillby of the 4142nd pacifist timeline of Outertale that gave him his standardized prefix, and owner of the restaurant known as Grillby's in this AU. He is a good friend of Celerity and Alpha that just wants to give a peaceful place for monster to reunite in, though he does not like humanity. He is aware of the existence of the Multiverse.
Psyka[]
Psyka is a member of the Trouble Troup. Her goals are to live a happy life and to replace each happy Chara of the Multiverse with her, as she is jealous of them, especially NewLie and to do so, she doesn't hesitate to make an alliance with Souls. She is very loyal to the Trouble Troup, though she sometimes acts like a cat. She is also known as Jealousy when she needs to fight seriously. As Jealousy, she is much more cruel, going to the extent of torturing her victims, planning to torture NewLie for eternity. She also is much more deceptive in this state. However, as long as NewLie isn't concerned, she can be a very kind and comprehensive person. She likes to eat fishes, loves cats, and loves kind persons herself.
When she eventually spends time with Zeno, she begins to want to adopt him and she gets excited when he shows signs of affection.
XGaster[]
XGaster is a member of 404's organization. He is an arrogant person because of his intelligence, having a lot of pride for his past as a scientist. He also hates to be treated like an idiot. He does not care at all about the other members of the organization, though he does not fight a lot. He hates when the other members of the organization state obvious remarks and repeat themselves, and also believes that most of them are useless, though Error404 classifies him as no better than the others. He doesn't hesitate to insult others to their face and to make them suffer.
Overcorrupt!Sans[]
Overcorrupt!Sans is a controlled member of 404's organization, known to be an enemy of Skell. He is very badly seen inside 404's organization to the point where he can't talk, except when he only is in Error404, NewLie, or Frostscreen's presence. He truly hates those that have the role of a god or the persons that call themselves gods. He also truly hates his treatment by the other members of 404's organization, and especially how he is not allowed to talk. He believes it to be an indirect consequence of the existence of the protectors and hates them because of it, and he also believes that he is superior to most other members of 404's organization. When he can talk, he curses and insults others a lot.
Killer!Chara[]
Killer!Chara is a member of 404's organization, a cold-blooded killer that gets easily angered, and is hateful. She also is impatient and insolent towards Error404, which makes her strongly disliked by her leader.
NewLie[]
Main article: NewLie
NewLie is a member of 404's organization, known as a very strong knight, and as an incredibly powerful fire magic user. She has knowledge of the existence of the Trouble Troup and it's members, as one of the members, Psyka, originates from the same universe as her and destroyed it, and is beware of it. However, she does not talk with the other members since she does not like them, and a lot of them hate her. She is curious, and 404 hesitates for her to become a main member of his organization when she is first introduced. In fact, unlike the other members of 404's organization, Error404 does like her presence, and has recruited her for the pure sake of helping her. She also is unlike most members of the 404's organization, wanting to protect AUs and people instead of destroying and killing. In fact, she doesn't want to kill anyone unless it is a person that can resurrect or unless it is Psyka. Because of this, and because of the many AUs 404 destroys in quick succession, she almost leaves 404's organization to join the protectors. However, after deciding that she stays, she becomes a main member of 404's organization, and becomes knowledgeable about Zeno's organization. When she eventually sees him for the first time, after hearing of him, she actually gets the desire of having a talk with Zeno.
NewLie has access to a special button called the Cheat button, that allows her to rewrite reality, though it comes with a drawback based on the intent NewLie has when she uses it. The more life-changing or destructive the intent is, the higher is the drawback. It could even possibly kill her upon use, which is why Error404 and Celerity do not like when she uses it.
She is benevolent and cares a lot about others, especially those she is especially close to. She can get very emotional and cry when she becomes incapable of helping people, or very helpful when she can change their lives for the better. She is also honest, often dismissing the ideas of people that can hurt others, and despises truly deceptive people. When trying to help people, she prefers to talk before fighting, but will fight if necessary. It becomes especially true when the help exists only to comfort them.
Artist!Sans[]
Artist!Sans is Innovation!Sans and Démolition!Sans's son, born in the new idea, his mother's anti-void. Though he is born in the new idea and has always been aware of the existence of the Multiverse, he started to visit it recently with the help of his father. He escapes the new idea when it is taken by the Infected cult, and is sent to gather a team to fight this cult. However, he ends up joining Opposite!Sans in his team, and gives to the team the secondary goal to destroy the Infected cult. The more he spends time with Opposite!Sans, the more he grows fond of him.
He only reveals his affiliation with Innovation!Sans and his indirect affiliation with Greattale when his group meets Innovation!Sans. This leads up to a battle against Great!Sans to protect Opposite. However, he is also the one to tell the truth about Greaty to Great!Sans, and that eventually convinces him to leave G's order.
Démolition!Sans[]
Démolition!Sans is a former destroyer that lives in the new idea. He currently tries to help his son to visit the Multiverse without giving him any boredom. He escapes the new idea when it is taken by the Infected cult, and begins to observe the Multiverse, while helping Innovation!Sans from time to time.
Innovation!Sans[]
Innovation!Sans is the owner if the new idea, as well as a creator of AUs, responsible for creating Greattale. Due to this ability, she gets Purity's interest and gets forced into being recruited by the Infected cult, in exchange for the survival of her family. Her role is to create AUs and persons for the Infected cult instead of directly fighting. She states that she has an ongoing project. She has full power on deciding whether if her creations live or not.
She actually wants the destruction of the Infected cult and makes sure that it doesn't become as powerful as it could be, while protecting some persons from their attacks. She gets the help of Dunamiz, Démolition!Sans, and G's order.
Dunamiz[]
An ancient creation of Innovation!Sans that serves as a mercenary, that had died and then resurrected by Innovation!Sans. Though he does it relcutantly, he works for the Infected cult. He works less reluctanctly for Innovation!Sans since she plans on protecting others, and also plans on betraying Infected through a long plan. He is a strong fighter that can hardly be shocked by many, and Infected often asks him to fight for him. He values his life and his capability to resurrect a lot, which is why he works for Infected.
Reaper!Sans[]
Reaper!Sans is the god of death in Reapertale. Due to his last interaction with his worst enemies and a new ally of them, he finds himself in the Multiverse, trying to stop Reaper!Chara from causing chaos in the entirety of the Multiverse. Since he wants to get a team to fight his enemies, he needs more information on the Multiverse. He quickly enters Opposite's team after the beginning of his journey in the Multiverse.
Unfortunately, it is difficult for him to always have allies with him, since he accidentally destroys everything when he is in a state of suffering. He actually has to get help to find his usual allies back. He also has trouble helping during fights as his main strategy is to quickly destroy the souls of his opponents.
Reaper!Chara[]
Reaper!Chara is the Chara of Reapertale in a corrupted state. Since she arrived in the Multiverse thanks to Pandora!Ink's help, she serves the same woman as Pandora!Ink, in exchange of the possibility to cause chaos in the Multiverse.
Reaper!Flowey[]
Reaper!Flowey is the incarnation of despair in Outertale. He arrives in the Multiverse and follows Reaper!Chara in everything she does. He is accepted by Pandora!Ink due to his potential in fights, and because Reaper!Chara refuses to follow him without Reaper!Flowey.
Upsilon!Asgore[]
The king of the Underground in Upsilontale. He gets killed by Infected because he talks for too long.
Great!Papyrus[]
Great!Papyrus is a member of G's order, as well as a survivor of the destruction of Greattale. He gets ordered by G to make the protectors lose time so they don't notice G's actions.
Great!Chara[]
Great!Chara is a member of G's order, as well as a survivor of the destruction of Greattale. He gets ordered by G to make the protectors lose time so they don't notice G's actions.
Outer!Frisk[]
The variation of Outer!Frisk that is shown in Undertale Psi is a male one from an eidocide route, when he is fighting Sans. He gets surprised by Outer!Sans's unnatural power, and thus does not load or reset immediately.
Outer!Sans[]
Outer!Sans gets injected determination by G before the fight against Outer!Frisk, and thus, beats him easily. With nothing left to do, Outer!Sans accepts G's proposal of a fight with Great!Sans. This is a short appearance, as he dies during the fight.
Swap!Chara[]
Swap!Chara is the Chara of Underswap, that takes Frisk's place in that AU. Swap!Chara is portrayed as having killed every Monster in the Underground multiple times, and that has a lot of fighting skills, to the point where they can fight for nearly an entire hour against Swap!Papyrus with no trouble.
Swap!Papyrus[]
The Papyrus of Underswap. Like Outer!Sans a bit before, he is injected determination by G before he fights the Chara of his AU. After this, he gets interested in visiting the Multiverse, as he discovers it exists via G's words. However, he has to fight Great!Sans to access it, and dies during the fight.
Fell!Frisk[]
The Frisk of Underfell, that quickly appears but also quickly disappears due to their death.
Fell!Sans[]
The Sans of Underfell, an often upset person that quickly takes fights. He is powered up by determination, which allows him to beat G. He easily insults people, and will not hesitate to let his rage take over him.
Pseudo-Eido!Sans[]
Originally the Sans from Undertale, the first universe to have existed, he is the successful subject of one of G's experiment. He becomes much more powerful due to determination in the first place, killing Frisk with ease and even having the ability to resurrect. Because of this, G offers him to enter his order, and he accepts. He eventually gets seven human souls inside him and goes to discover the Multiverse.
Later on, he discovers G's true goal, as well as its consequences thanks to Celerity. Because of this discovery he begins to want to destroy G's order from the inside, opting to act like Great!Sans. His plan is to get G's trust and to fake to dismiss Great!Sans's existence to secretly help him better with his plans. Since Great!Sans leaves G's order, he becomes Great!Sans sole spy in the organization.
Vĕdomi!Alphys[]
The Alphys of Vĕdomitale. She is the royal scientist in this AU, and is the person that sent the invites to the AU party. However, her technology is limited, and she looks for the help of the protectors to gather all the persons invited to the party. During the party itself, she tries to find out who abducted the amalgamates, but dies a few minutes after discovering it.
Vĕdomi!Asgore[]
The Asgore of Vĕdomitale, King of the Monsters. He makes sure to guarantee the protection of the guests during the AU party, but doesn't act by himself as he is the first victim of the incursion.
Prunsel[]
Prunsel, also called "The Eye", is a giant, colorless eyeball that has been created by Ink!Sans thanks to Broomie, and then sealed in blank universe 24 for 6000 years. It has the goal to destroy the Undertale universe and to destroy every Out!Code that goes against Pandora!Ink, and trained during all the time it was sealed to attain its goal. It also observed the Multiverse and has gathered a lot of information about it, knowing many Out!Codes. It is free thanks to Pandora!Ink's help, and serves him again. While it attacked Vĕdomitale during the AU party, it died during the fight, destroying the AU in the process.
It has two forms, the first one being a gigantic eyeball, and the other one being this same eyeball with multiple wings added to it. The second form is more powerful than the first one, and allows Prunsel to affect entire timelines in many ways. This second form is the culmination of the trainings in the blank universe.
Sans!Sans[]
Sans!Sans is a mysterious Sans looking like Classic!Sans that got an invite to the AU party. The protectors hate him due to an event that happened 7800 years ago, though the even itself has yet to be told about.
Cross!Sans[]
A skeleton that originates from the universe known as X-tale, often deemed unlucky due to his story. It is a servant of Souls, invited at the AU party. There, he shows himself to be very bad at dancing. He deeply hates XGaster and has the end goal of beating him, though he fears XGaster a lot. For that, he doesn't hesitate to ally with Souls, a person he likes due to his honesty, even though he is used by Souls.
Cross!Chara[]
Cross!Chara is the Chara of X-tale. He is a spirit inside Cross!Sans's mind. They are allies and communicate very often, though he is often teased by Cross!Sans due to its spirit state. Souls also likes to tease him from time to time, and since he doesn't always think before speaking, he often falls in his boss's trap. He says what he thinks most of the time, and has the end goal of ending XGaaster's life.
Multiversal Web!Muffet[]
Multiversal Web!Muffet is the leader of a group of spiders that wants to conquer the Multiverse. She is described as an extremely dangerous Muffet with an extreme quantity of souls and LOVE.
It18!Undyne[]
The Undyne from Flowey's World. This is the first trace of life the protectors find in this AU. She guards the lower laboratory due to her ability to see in the darkness. She hardly ever finds someone that meets her requirements to go to the lower laboratory. She is in a love relationship with her Alphys, but finds herself unable to protect her lover in the end.
It18!Muffet[]
It18!Muffet is the first member of the resistance that accepts to talk the protectors. Since she is one of its most talkative members, she often takes care of the inquiry past Undyne. She also decides whether or not it is worth to bother Alphys for a matter. She ends up being recruited by End!Muffet after the latter and It18!Mettaton give her convincing arguments.
It18!Alphys[]
The leader of the resistance. She is the one to take care of the Human, and the strategical mastermind of the resistance. She now lives in the lower laboratory and is in a love relationship with Undyne. She doesn't partake in combat, since she is weak.
Entropy!Frisk[]
Entropy!Frisk is the holder of the reset power in Entropytale. In this AU, his reset makes the world worse each time it is used. Since he realizes it too late, he ends up in horrible worlds and continues to reset in hope to have a good ending without killing everyone. He doesn't know that it is not possible, and that even if he killed everyone, everything would happen over and over again without him noticing. He owns two invites to the AU party, helping him to be noticed by the protectors, and is the one to help Timekid!Sans to understand what AU they are in. When he eventually gets outside his universe, he reveals that he hates his origin AU so much that he wants it to be destroyed.
Later on, after surviving to the AU party, he eventually gets resuced by Toriel the Survivor Seeker, and now inhabits in her universe.
End!Muffet[]
End!Muffet is a Muffet that works for Multiversal Web!Muffet, specifically one of the six hands, the most high ranking members. She was the one to find the Entropytale universe and to make the plan to recruit as many servants as they could wish. While she loves killing, since she is the one that makes the plan, she has to refrain from killing from time to time. She is known to be capable of showing people their greatest fears.
It18!Mettaton[]
It18!Mettaton is one of the co-leader of the resistance. He has the mission to help the members flee Hotland, but fails at this mission, instead having to fight End!Muffet. Though he escape the fight alive, he ends up confronting another being that absorbs his soul.
It18!Sans[]
It18!Sans is one of the co-leaders of the resistance. He is rarely active and is supposed to be fighting Entropy!Flowey only. However, he accepts to be called to stop the invaders. However, he ends up doing nothing since nobody actually fights him. He gets his soul absorbed without any way to fight back.
It18!Papyrus[]
It18!Papyrus is a husk used by Entropy!Flowey for his plan to absorb the souls of the inhabitants of his AU. Thanks to this, he also shocks It18!Sans.
Entropy!Flowey/Asriel[]
Entropy!Flowey/Asriel is the only person other than Frisk that remembers about the previous iterations, revealing himself to remember everything since he started to exist as Asriel. His goal is to manipulate the events of each iteration to eventually get seven Human souls or its equivalent, become Asriel again, reset, kill everyone and bring back his daughter. He eventually becomes Asriel again and resets.
Broken!Science[]
The Sans of Vĕdomitale, first referred to as Vĕdomi!Sans. He is the former royal scientist and an associate of Alphys in his universe. He is often accompanied by Fido and sometimes by his brother. He participates in the fight against Prunsel, though his attacks have no effect. He eventually survives to the destruction of the AU and makes a deal with Entropy!Frisk to become better at surviving in the Multiverse. He also desires to protect other AUs so they don't suffer the same fate as his.
His first encounter in the Multiverse is with G, who forces him to absorb a soul. After this event, his four souls start to quarrel to get the most influence on him. He eventually takes the name of Broken!Science when he joins Opposite's team to study AUs. As he spends time in the AUs and in the Multiverse, he learns more and more about Multiversal culture and about other AUs overall, as well as more about his allies.
Fido[]
Fido is a Gaster Blaster that accompanies Broken!Science. It is his personal guard, as well as Vĕdomi!Papyrus's. Like Broken!Science, it survives to the destruction of the AU. It can't talk, and only does its job, which is to protect Broken!Science.
Vĕdomi!Undyne[]
Vĕdomi!Undyne is the captain of the royal guard in Vĕdomitale. She serves as Asgore's main help to protect the guests. She is a good fighter, and kills a few of the Eye Corrupted inhabitants of Undertale. The only reason she doesn't kill a few others is because she gets killed by Xéno!Frisk beforehand.
Vĕdomi!Papyrus[]
Unlike in other AUs, Papyrus in a royal guard in Vĕdomitale. While his job takes a lot of time, he still cares a lot about his brother and about Fido.
Eye Corrupted!Alphys[]
The first of Prunsel's victims to be shown during the AU party, though she appears only briefly. She kills Vĕdomi!Alphys using a knife. She shows a sadistic side when doing so.
Eye Corrupted!Sans[]
One of Prunsel's victims. Now corrupted, he doesn't hesitate to show all of his power at any time.
Eye Corrupted!Undyne[]
One of Prunsel's victims. She teams up with Eye Corrupted!Muffet to kill Vĕdomi!Undyne. She doesn't hesitate to use unfair strategies, but is also the one to tank damage for her allies.
Eye Corrupted!Muffet[]
Eye Corrupted!Muffet is the only one of Prunsel's victims to have survived to the AU party, thanks to End!Muffet's protection. She now is in a group of spiders that desire to conquer the Multiverse, and is back to her normal state. Her normal state disappoints the other spiders, but the information she got thanks to her time with Prunsel prove very useful to them.
Vĕdomi!Muffet[]
The Muffet of Vĕdomitale, recruited before Multiversal Web!Muffet and End!Muffet had shown themselves in the AU party. Due to Prunsel's spell of hatred, she kills seven Muffets, even though they are her allies. End!Muffet chooses her to play a part in a project.
It19!Muffet[]
The Muffet of the 19th iteration of Entropytale. She first appears trying to immobilize Vĕdomi!Muffet, and explaining End!Muffet what the latter has done.
Toriel the Survivor Seeker[]
Toriel the Survivor Seeker is a survivor from the Storyswap universe. She now reunites a few people from different AUs to protect them in her empty home AU. She does it to feel less lonely in her universe and fears loneliness as a whole. Due to this, she hates travelling through the Multiversal Void, even though she is forced to.
Souls!Chara[]
An inhabitant of the Storyswap universe saved by Toriel the Survivor Seeker. She holds a big grudge against Souls, and claims him to be the reason she is in this universe in the first place. She acts as an antipathetic and sarcastic person. She has an extreme hatred towards Souls and wants to eliminate him as quickly as possible. While she is antipathetic, she has a bit of affection for Souls!Sans and Entropy!Frisk.
Souls!Sans[]
Souls!Sans is Souls!Chara's main associate. He tries to protect Souls!Chara from being hated and defends her, though his true role in her group is unknown.
Neime[]
A member of Souls!Chara's group, also saved by Toriel the Survivor Seeker. She travels in the Multiverse while staying unnoticed to find the map of the Multiverse for an unknown purpose. She dislikes Souls!Chara but reluctantly allies with her since she knows it is the best decision to take. She is a very kind, polite, and respectful person, even towards strangers and potential enemies. As such, she's the one to help Infinite!Sans and Infinite!Chara discover the Multiverse most.
When the protectors discover that she tries to steal the map of the Multiverse, she explains that all the information it can give can be the key to stop the Trouble Troup.
Mr. Tickle[]
Mr. Tickle is a living scarecrow that guards the door to Choco's bedroom, and one of the members of the cucumber trio in Crrraappytale. He talks in random ways but takes his job seriously.
Crrraappy!Chara[]
The Chara of Crrraappytale. She is the Queen of the AU, though she hides that she's female, as the reveal would destroy the Kingdom. She quickly gets a liking for Zeno. She hates humanity and would not hesitate to attack a Human on sight. She is aware of the existence of the Multiverse, since she has received a visit from Souls, and fears a lot that her daughter would be in danger inside it. However, she still lets Zeno take care of Choco. Later, however, she orders the cucumber trio to go in the Multiverse and eliminate any threat to the AU.
Omega[]
The Sans of Crrraappytale, always called Omega. He is a member of the cucumber trio, the elite warriors of the Queen. He also is Choco's father. He knows Chara very well, and knows that she doesn't act as usual. He rarely places his trust into people, but is smart. His lack of trust makes him fight Zeno. During a fight, he deeply hates mockery and, even though it may not be the case, he often believes that a lot of actions during a fight are mockery.
Choco[]
Crrraappy!Chara and Omega's daughter. She is the princess of the Underground, and because of her existence and her powers, she is sealed in her bedroom, rarely receiving visits from anyone other than Mr. Tickle, her personal bodyguard. As soon as she appears, she is taken by Zeno into his headquarters with approval of her parents, getting the freedom she desires.
She easily gets used to being with Zeno and mostly spends time with him, sometimes playing games and sometimes even visting AUs together. Later on, as Zeno shows more liking of her, she begins to call him big bro, and begins to show even more affection towards him. She also trains to control her magic with him, greatly enjoying any moment she spends with him.
Possessor!Flowey[]
The Flowey of Possession, named Possessor!Flowey by Purity. He continues his quest of killing in the Multiverse, but due to the sheer power of some Out!Codes, he allies with the Infected cult to do so. He is accepted in it because he has the ability to control people that he can abuse very easily. He abuses this ability a lot and is very manipulative, even without it. However, he knows when to not provoke people into fighting him. He quickly gets the soul he desires thanks to the help of Infected's cult, a prejudice soul.
After he gets the prejudice soul, his appearance changes, as his back is now half an Asriel body.
Upsilon[]
Upsilon is Human inhabitant of Upsilontale. He is tasked with keeping the AU safe. He knows of the Multiverse and of the threat Overcorrupt!Sans is. While he doesn't like to talk about himself or his AU, he doesn't force Upsilon!Gaster to do so, and is worried about Skell. Upsilon is a calm and reserved person that prefers to watch rather than act himself.
Upsilon!Gaster[]
The Gaster of Upsilontale is a spirit that follows Upsilon and helps him with his task. He mostly helps with fighting and AU to AU transportation. He tells the protectors everything there is to know about Skell.
TF!Muffet[]
One of the hands of Multiversal Web!Muffet. She is the leader of an insider spying service, that always keeps watching the AUs of the Multiversal Web. She truly first acts as the self-promoted representative of the Multiversal Web in the Outertale meetings when a threat to the Multiversal Web arises, but she doesn't help the rest of the Multiverse much.
Axe!Muffet[]
One of the hands of Multiversal Web!Muffet.
Fell!Muffet[]
The first Fell!Muffet in Undertale Psi insults Multiversal Web!Muffet and her organization, which leads to her death. Because of this, End!Muffet recruits a second iteration of her. She hesitates for a bit but accepts to enter in the group when she realizes it is her only way to survive.
Fell!Papyrus[]
The Papyrus of Underfell. He sets up deadly traps in the Snowdin forest.
Fell!Asgore[]
The King of the Monsters in Underfell. He is the one to have set up the motto of kill or be killed. While he was the one to set up this law, he hates people killing excessively and goes out to kill them himself. He is harsh and ruthless.
Kevin Mindbreak[]
The last member of the cucumber trio introduced in the story. He is a very harsh person that rarely takes anything seriously, and seemingly tells random statements. However, he is incredibly loyal to the rest of the cucumber trio and will not hesitate to follow the orders of Crrraappy!Chara. He can get upset easily and his favorite way to kill others is to cut their throats.
Before!Chara[]
The Chara of Beforetale, that has exterminated both Monsterkind and Humanity in her AU, then was recruited by Souls. While she doesn't like being in the Trouble Troup, she originally had accepted to enter it because she was incapable of travelling from one AU to another. Like a lot of Charas, she deeply hates Humanity, and exterminates Monsters to destroy Humanity in the Multiverse once and for all. She is an impatient and arrogant girl, yet is the weakest member of the Trouble Troup according to Souls.
Actually, during her travels in my AUs, she has injected a lot of determination in herself to power herself up, gaining the ability to resurrect, and an incredible power. She wants to kill Souls and betray the Trouble Troup to gain power only for herself, and only stays in the Trouble Troup because of her lack of other choice.
Crisk[]
A person first mentioned by Souls as being the unluckiest person in the Multiverse. He is a member of the Trouble Troup. He lacks patience and gets the desire to kill very easily, even if it is killing his own allies. He hates arrogance in others because he believes himself to be superior to others. Crisk, while not being very powerful, can cut anything with his knife and has regeneration abilities with variable efficiency that depends on his hatred.
Neg[]
A member of the Trouble Troup. Souls prevents them from discovering a secret about an AU. They are a being of hatred with a lot of confidence and great fighting capabilities, very respected by Souls. Neg is actually a very manipulative person, whether it is to its allies or to its enemies, though its intents depends on the state of their relationship with the person they deceive. It also is an intelligent being that quickly comes up with plans and wise advice. They have a good relationship with Nashi Masuku and helps him understanding complex feelings and good behavior, often acting as a mother to him. Neg also shows themself as a person that hates all kind of laws due to the prejudice they can bring.
Alternate!Asriel[]
The king of the Monsters in Alternatetale. He is Zeno's main contact in this universe. He is a respected king that cares deeply about his children and wants them to feel comfortable in their life, while taking care of hid duties in New Home. He has access to technology advanced enough to traverse through AUs.
Alternate!Flowey[]
The Flowey of Alternatetale is one of the rare golden flowers to exist in the AU, picked up by Asriel and put in a flower pot. It doesn't wilt thanks to Asriel's magic. Unlike many Floweys in many AUs, this one had no knowledge whatsoever, and doesn't do anything noticeable.
Alternate!Toriel[]
Asriel's daughter in Alternatetale. She has a competitive mindset, but loves her brother nonetheless. She is a slightly authoritative person, yet acts as a child from time to time. She is engaged with the Sans of the AU.
Alternate!Asgore[]
Asriel's son in Alternatetale. He has a competitive mindset, but loves his sister nonetheless. However, he is very critical of her love life. He acts as a child from time to time.
Alternate!Gaster[]
The royal scientist of Alternatetale, appointed by Asriel with later approval is his colleagues. He is the father of Sans and Papyrus. He in interested in magic and is one of the most powerful beings in the AU because of it. He also is very respected by the rest of Monsterkind.
Alternate!Papyrus[]
The captain of the royal guard in Alternatetale, a skeleton so small that he has a complex because of his height. While small, he is one of the best fighters in the Underground, which allowed him to get his position. He is known to be magnanimous and brave. He also is very respectful towards other Monsters.
Alternate!Napstablook[]
The hero of the Underground in Alternatetale. He is a member of the royal guard, recognized for his courage. His most recent case is arresting Jerry.
Sang!Undyne[]
The Undyne of Sangtale. She always wears her armor because her queen demands it.
Aiko[]
Aiko is the cruel queen of Sangtale and the most direct servant of Infected's cult in this AU. She may advise Purity from time to time, though she beats her son more often. She also gives speechs from time to time. She is the one to announce that the goal of the existence of their AU is to destroy other Out!Codes for Infected.
Krasmein[]
A Human that comes from a universe where the inhabitants have access to Multiversal travel thanks to technology. He escaped prison and went to the Multiverse. His goal is unknown at the beginning, and he has close to no information about the way the Multiverse works. He later reveals that he desires the complete extinction of Monsterkind in the entire Multiverse. He loathes Monsters and their allies, not hesitating to attack them on knowledge of their existence. According to him, Monsters are deceptive beings whose secret true nature is one of endless cruelty. His main soul is a soul of animosity, though he has absorbed six other Human souls, making him a six-winged god.
Eventually, as Zeno gets his organization to fight Krasmein, it is revealed that the six-winged god is a criminal that originates from the same AU as Zeno, and loathes him for being a Human-Monster hybrid Calling him a coward that flees from his responsibilities and claiming to know the truth about him, he doesn't get hurt at the time, but when Zeno's organization returns to fight him, he is eventually defeated, brought back to his AU and sealed in a pocket dimension for the rest of his life. He also begins to fear the Multiverse.
Sang!Mettaton[]
The Mettaton of Sangtale still has his television shows and is a direct ally of the queen Aiko.
Sang!Sans[]
The Sans of Sangtale shows a hatred for Humanity, whether it be for the Humans in his AU or for others.
Sang!Papyrus[]
The Papyrus of Sangtale likes to drink blood like every inhabitant of the AU. He still wants recognition and decides that killing other Out!Codes is the way to get it.
Sang!Alphys[]
The Alphys of Sangtale has absorbed seven Human souls in the past. In the story, she fails at telling her allies that Out!Codes are in the AU, and she is obsessed with getting Infected's desires to become true. Her slightly suicidal thoughts from the past helped her conceive a suicide-kill attack that she dies from soon after she appears.
Sang!Undyne[]
The captain of the royal guard is one of the people Aiko tolerates the most. While she shows care for her fellow royal guards, she lacks any kind of feeling regarding innocent people. She also likes to boast about her power, yet dies during the only fight she partakes in during the story.
Great!Gaster[]
The father of Great!Sans, Great!Papyrus, and Greaty. He is a ghost that follows Opposite!Sans is his journey, and, as Opposite's grandfather, serves as his advisor and helper in fights. He rarely acts and rarely shows himself, and first does so when he notices the presence of his son in front of him.
Upsilon!Frisk[]
The Frisk of Upsilontale has an awareness of the existence of the Multiverse thanks to Skell. She deeply despises Out!Codes due to their way to live and their way to see the AUs, except for Upsilon and Skell. She also tries to get all the possible endings in Upsilontale. When she is introduced, her most recent finished run led to a king Onionsan ending.
Her disgust for Out!Codes leads her to request Celerity to do a perfect pacifist route, just so she can tell him why she fails. She is harsh towards them, but eventually gets Celerity's point of view of the Multiversal lifestyle, and understands that they are better persons than she believed. She also learns to make a bigger distinction between protectors and destroyers, and begins to treat Out!Codes better.
Upsilon!Flowey[]
The Flowey of Upsilontale has not done everything in the AU. He greatly appreciates his Frisk for the unpredictability of the outcomes of her actions, finding those greatly amusing. While he has no remorse for any terrible action he may do, he claims to not want to talk about certain subjects and prefers not to use certain words, calling himself "decent with words" for these reasons.
Upsilon!Undyne[]
She still is the captain of the royal guard in her AU. When she cooks with Papyrus, she always burns her house, which she states happens at least once a week.
Upsilon!Sans[]
He is the judge and executioner of the Underground. Thanks to his ability to see LOVE, he can decide to legally kill someone if their LOVE is higher than one, or if they are a Human. However, he is not without mercy nor perspicacity, as he may let one go depending on how they get LOVE. He also can easily notice that Celerity is manipulating the inhabitants of Upsilontale.
Upsilon!Toriel[]
The queen of the Monsters exiles herself in the ruins out of cowardice. She is presented as highly hypocritical and cruel towards her Asgore, to the point of doing acts of treason. When confronted with the actual truth, she goes cry in her room in realization of how she truly is. She also has the ability to easily see puns coming.
The red man[]
A red-haired and red-eyed man that originates from the same AU as Krasmein. Both are enemies, yet Krasmein seems incapable of overpowering him. He is a very calm person that is not interested in traveling outside his universe. He claims that the only reason he does not stop Krasmein is because he does not work for the people that should do it, instead relying on Zeno, that he first calls an "official". When he reappears, he serves as Zeno's main help to not interact with too many persons while getting Krasmein officially imprisoned again.
Fake!Chara[]
Fake!Chara is a clone of Xéno!Chara created by Zeno to be a torture puppet for Xéno!Papyrus and Xéno!Frisk, but once she appears, she is used by Error!Sans. While it seems like she has a consciousness, she actually lacks one.
Greaty[]
Greaty, formerly known as Malediction, is Great!Sans and Great!Papyrus's brother, as well as a member of G's order. He gets back to his original state, Greaty, thanks to Innovation!Sans's help, and since then, serves G. However, he still is very secretive about his identity.
Even though ha absolutely hates Dunamiz and tries to kill him the first times he sees him, thanks to Dunamiz's talk, Greaty discovers the truth and becomes more tolerant towards the mercenary. He even accepts Innovation!Sans's plan. He wants to get Opposite and his father close to him again.
Infinite!Sans[]
The Sans of Infinitetale. Very similar to his Undertale counterpart, but he has electrical powers. He gets controlled by Possessor!Flowey, but later gets saved by Dunamiz and Toriel the Survivor Seeker. He comes to Storyswap with the latter and Infinite!Chara. Calm, he doesn't panic, instead wanting to work on studying the Multiverse.
Infinite!Chara[]
The Chara of Infinitetale. Prior to the events of Undertale Psi, she used to be dead, but was resurrected by her Sans during the story. She gets controlled by Possessor!Flowey, but later gets saved by Dunamiz and Toriel the Survivor Seeker. He comes to Storyswap with the latter and Infinite!Sans. When she realizes she has lost the prejudice soul, she panics for a bit before being reassured. She has a great desire to eat.
Infinite!Asriel[]
The Asriel of Infinitetale. Unlike the two other survivors, he escapes to Possessor!Flowey's control. He is a ghost that can only be seen by his Chara. He sometimes tells Infinite!Chara about how Monsters worked in Infinitetale.
Locations[]
Undertale Locations[]
Hotland[]
The original version of Hotland, a hot place that is mostly inhabited by monsters that are very used to such heat. This is the place where Ink!Sans hid after leaving the protectors.
Last Corridor[]
The original version of the Last Corridor. G goes there as soon as he is free from being locked in the Cursed Void.
Throne room[]
The throne room of the original universe. Asgore is the only person that usually goes on there.
Waterfall[]
Waterfall is where the first battle against the Eye takes place.
Snowdin[]
The first place Celerity goes in the timeline ravaged by Prunsel. It is where he sees how much the timeline is lacking of traces of life, and where he meets with Error404. This is also where the fight against the Astral Mother happens at the end of the first book.
New Home[]
The last point of Undertale in the order most Out!Codes visit the universe. This is where Celerity and Error404 leave each-other.
Snowed Inn[]
The Snowed Inn shown in Undertale Psi is a version of it from an eidocide timeline that nobody takes care of. Celerity brings NewLie in it to heal her.
Added Locations[]
Multiversal Void[]
The Multiversal Void is the main part of the Multiverse. It is a gigantic Void in which the universes and anti-voids are. It is used as one of the ways to travel from an AU to another.
Zeno's headquarters[]
The headquarters of Zeno's organization. The members use it to learn about the Multiverse and the missions Zeno give to them. The inhabitants of Xénotale that are members of the organization use it as their home.
Dreemurr Palace/Undertale: The Ultimate Timeline[]
It is the palace of the royal family of the monsters in Undertale: The Ultimate Timeline. It is guarded by the royal guards. The king of the monsters, Asriel Dreemurr, and the queen of the monsters, a person of an unknown identity, live there.
Royal laboratory/Undertale: The Ultimate Timeline[]
The laboratory the two royal scientists work in in Undertale: The Ultimate Timeline. When Zeno is absent, a winged skeleton replaces him.
Cursed Void[]
An anti-void controlled by a being named Malediction, that serves as the base of operations for G's order. It is a place only the members of G's order enter, which allows for G to concentrate and easily make up his plans.
Mainframe[]
Error404!Sans's anti-void, that serves as the base of operation of his organization. It also is where he and King Multiverse!Sans lives. He often brings the statue of Infected to experiment on it. It is the place that is used for the reunions of 404's organization.
It is described as a fauna-less forest, below a white, cloudy sky.
Alphys's laboratory/Determinatale[]
The laboratory Alphys works in in Determinatale. It is where she created DT injection. The Alphys of Determinatale os there very odten.
New Home/Determinatale[]
The version of New Home of Determinatale. Asgore lives there. Sans comes there very often. The human souls are not there anymore since they have been resurrected by Asgore, and the Barrier is theorized to never break in the future.
Anti-void 6[]
Error!Sans's anti-void, that corrupts the code of those who stay in for too long. Error!Sans and Error!Asgore live there.
As discovered by Error!Sans, when it corrupts the code of an individual, it actually creates a copy of the code of the individual that exists in it, stocked in the anti-void 6 itself. It corrupts the code of the individual then makes the corrupted version become the code of the unique version of the individual that is inside it.
Doodle Sphere[]
The Doodle Sphere is Ink!Sans's anti-void during the beginning of the story, later becoming Alpha!Sans's anti-void. It is the headquarters of the protectors of the AUs. It also hosts their archives. The Doodle Sphere is full of Ink!Sans's traps and drawings, though they are removed by Alpha!Sans when he claims the Doodle Sphere, abandoned by Ink!Sans after his past is discovered. When Alpha!Sans dies, ownership of the Doodle Sphere is lost, though Celerity!Sans takes it as he becomes the leader of the protectors.
The laboratory[]
Ink!Alphys's anti-void, where she lives and creates her devices. It has a giant screen that allows to look at the AUs and their timelines, and is full of devices as well. It has the special trait of being capable of connecting to AUs.
Archives of the protectors[]
The archives of the protectors is a building in the Doodle Sphere, that hosts folders about everything the protectors know and have known about the Multiverse and what it contains. It is filled with traps made by Ink!Sans, though they usually do not come into use. Sometimes, it is guarded by someone. The folders in the archives are never moved.
Waterfall/Determinatale[]
The version of Waterfall in Determinatale. It is filled with royal guards fighting with each-other, and Undyne who fights all of them.
Artefact room/Determinatale[]
The room in which the legendary artefact is in Determinatale. It serves as a secret base for the resistance. Since the resistance is composed of ghost monsters, they don't need to use the piano to get in it, which is why they use as their base.
Snowdin/Determinatale[]
The Snowdin of Determinatale. The only confirmed inhabitants are Sans and Papyrus. It is the last place in Determinatale visited by Error!Sans, Error!Asgore, Blueberror and Timekid!Sans.
Source code of Determinatale[]
The source code of Determinatale is a place in the AU. Without it, the AU can't exist. It is destroyed by Error!Sans, destroying the AU in the process.
Remnants of Chaostale[]
The remnants of Chaostale are the few parts of Chaostale that Chaos has not destroyed in order to keep itself in its AU. It has been turned into a house by Aether and Erebus, that they use as their headquarters.
Blank universe 187256[]
A blank universe Celerity!Sans used to keep Opposite!Sans safe.
Xéno!Chara's house[]
Xéno!Chara's house is a place located in the Void of the sixth eidocide timeline of Xénotale, serving as ahome for the Chara of this same universe. It contains plenty of books and is a big house overall, though she lives alone. Sometimes Zeno goes there to visit Xéno!Chara.
Alphys's house/Corrupted Justice[]
A house in the Corrupted Justice AU, located at the end of the ruins. CJ!Alphys and CJ!Chara live in this house.
Blank universe 1[]
The blank universe 1 is the place Infected and Purity currently live in, serving as a safe harbor for Infected to prepare his attacks and for Purity to make its plans. It is not completely empty like other blank universes because it has a corpse inside it, the corpse being used by Infected to recognize the blank universe. Thanks to the theory of the age of the universes, it is implied that it is the first blank universe and the second universe to have ever existed.
Sans's laboratory/Corrupted Justice[]
The laboratory of the royal scientist, Sans, in Corrupted Justice. It is full of CJ!Sans's inventions, but lacks Alphys's likings. Besides that, it is very similar to a normal laboratory in many AUs.
The STAR[]
The equivalent of the CORE in Corrupted Justice. It is where the Showmaster spawns and begins his show, manipulating CJ!Asriel inside it.
Throne room/Corrupted Justice[]
The throne room of Corrupted Justice, full of echo flowers instead of golden flowers, though they do not speak when Ink!Alphys and Celerity are inside it. The one to be inside it most of the time is CJ!Undyne.
Flower bed/Corrupted Justice[]
The place CJ!Frisk is when he falls in the Underground in Corrupted Justice, and where he gets manipulated by the Showmaster.
Waterfall/Corrupted Justice[]
The place CJ!Papyrus is active in in Corrupted Justice, being its supreme protector. However, in the story, he fails and CJ!Asriel kills everyone.
Ruins/Corrupted Justice[]
The ruins in Corrupted Justice are the place CJ!Frisk visits first, where he can find a bunch of monsters, CJ!Chara as well as CJ!Alphys, and her house. During the story, everyone dies there.
Snowdin/Corrupted Justice[]
The Snowdin of Corrupted Justice is the place the game of death ends in, with everyone dead and its winner announced, near the exit of the ruins.
Frostscreen's cave[]
Frostscreen's cave is located within an artificial mountain in the Snowdin of Icetale. It is where Frostscreen!Sans hides in. It has a stock of paper and writing material so Frostscreen can communicate in.
Snowdin forest/Icetale[]
The forest of Snowdin in Icetale is mostly unchanged. It is where Xéno!Papyrus and Xéno!Frisk appear and then are found by Cream. It is also where Blueberror and Timekid!Sans first go when they enter the AU.
Coldland[]
Coldland is the equivalent of Hotland in Icetale. Due to their resistance to the cold, the spiders of Icetale mostly live there.
Snowdin town/Icetale[]
The Snowdin town in Icetale is where Sans, Papyrus and Katelyn live in this AU.
Ruins/Icetale[]
The ruins in Icetale are not shown for long, but this is still where Ice!Frisk and Ice!Chara fall. It is where the group of spiders appear. Asriel lives in the ruins instead of Toriel.
New Home/Icetale[]
The New Home of Icetale, the last safe place that exists for a short time in the timeline invaded by the infestation. Blueberor goes there to rescue Ice!Frisk but fails.
The official place for the Outertale meetings[]
It is a place in Outertale where the Outertale meetings are happening, though the timeline they happen is different for each meeting. It is a place of peace where nobody is authorized to attack unless they want to defend the meeting itself.
Kastel-Souls[]
Kastel-Souls is a flying castle owned by Souls, that can be found in the AU known as Soulstale. It serves as the headquarters of the Trouble Troup. It has a laboratory inside it.
Grillby's/Outertale[]
The Grillby's of Outertale is a restaurant owned by P4142!Grillby, made to be a peaceful place where the people can eat.
Surface/Soulstale[]
The Surface of Soulstale is an easy to access place that is devoid of sentient life.
Space/Soulstale[]
The space of Soulstale is a place without sound, that needs telepathy to allow of communication. It is where King Multiverse dies, and where Zeno eventually finds Broomie.
The Arena[]
The Arena is Celerity!Sans's anti-voids, that was owned by King Multiverse!Sans before his death. It is an anti-void where people can't die, making it a place for fights.
The anti-void of Evil[]
Referred to the anti-void of Evil in the title of the episode it is presented in, this anti-void is an anti-void with no known name. However, it has multiple rooms, such as the office, the bedroom and the coffin room. The coffin room only contains a coffin, that itself contains a corpse along with a golden knife. The office is a place of dead beings of unknown origin.
This anti-void has an extremely special trait to make people suffer in many ways, physical or psychological.
New idea[]
The new idea is Innovation!Sans's anti-void. It is a code re-organizer, that serves as the place for Innovation!Sans to create her AUs, and as the place where Innovation, Démolition!Sans and Artist!Sans inhabit. It is taken by the Infected cult as soon as it appears.
Space/Outertale[]
A big place in Outertale, described as a perfect place for fights. Though it is space, for an unknown reason, it is possible to hear people in there.
Snowdin village/Axetale[]
The snowdin village of Axetale is a lifeless place, where no building stands. It is the case due to an old attack from a spider group, resulting in the entire AU to be part of the Multiversal Web. It gets destroyed at the same time as Axetale.
New Home/Upsilontale[]
The New Home of the AU known as Upsilontale, where the last part of the invasion of the AU by Infected's cult happen. A battle between the Infected cult and Skell happen there.
Zeno's house[]
The house Zeno inhabits in in Undertale: The Ultimate Timeline. He has a collection of books in it, which contains seventy physics books.
Last Corridor/Outertale[]
The Last Corridor is the place Frisk and Sans fight in in Outertale, and where Great!Sans fights Outer!Sans.
Last Corridor/Underswap[]
The Last Corridor of Underswap is where Chara and Papyrus fight in the AU. It is also where Great!Sans fights Swap!Papyrus, after he has watched Swap!Papyrus fighting Swap!Chara.
Last Corridor/Underfell[]
The Last Corridor of Underfell, a place soiled due to Fell!Sans's attacks. He fights Fell!Frisk, G and Great!Sans in there, and blows himself up, which destroys a small part of one of its walls.
Blank universe 24[]
The 25th universe to have ever existed, this is the universe the Eye is sealed in. It is a universe nobody went in since the Eye has been sealed, and nobody knows it is in there.
X-tale[]
X-tale is an emptied universe that was left by its few survivors. It is theorized to serve as a garbage dump for other Out!Codes by Souls.
Blank universe 56123[]
The blank universe 56123 is one of the numerous blank universes Opposite!Sans and Artist!Sans visited. They find an invite to the AU party inside it.
Upper laboratory/Flowey's World[]
In Flowey's World, the upper laboratory is Alphys's former laboratory, slightly destroyed due to Flowey's attack. It is still intact enough to not let light pass, and is shrouded in darkness. It serves as the only way to go to the lower laboratory, but is guarded by its Undyne.
Lower laboratory/Flowey's World[]
In Flowey's World, the lower laboratory is the true laboratory. Since it has never been attacked by Flowey, it is intact and serves as the base of the resistance. Guarded by its Undyne, almost no new face ever shows there. It is powered by an energy source, and thus it is possible to see there.
Asgore's house/Vĕdomitale[]
It is where the AU party takes place. As the incursion by Pandora!Ink and Prunsel is going on, it gets more and more destroyed, eventually ending almost completely annihilated even before the destruction of the AU itself.
Megalab/Vĕdomitale[]
Also called A-1, it is the main laboratory in Vĕdomitale. Vĕdomi!Sans and Vĕdomi!Alphys reunite there to talk about the disappearance of the amalgamates.
New Home/Storyswap[]
The New Home of Storyswap is described as the least ravaged part of the Storyswap universe. Is still shows some signs of destruction and mass murder. It is where the persons saved by Toriel the Survivor Seeker live in the AU.
Throne room/Crrraappytale[]
The throne room in Crrraappytale. It is occupied by the Chara of the AU. The audiences with Chara happen there, and she may be accompanied by a member of the cucumber trio there, though not of the royal guard.
Choco's bedroom[]
Choco's bedroom is a place that exists in Crrraappytale. As it names tells, it serves as the bedroom for a skeleton-succubus hybrid named Choco. While it is full of ways to spend time, it is the one of the only places Choco remembers and the one Choco sees almost all the time. It is guarded by Mr. Tickle.
Altertale[]
The Altertale universe is the universe Killer!Sans and Killer!Chara attack. It is full of dust and no survivor is seen. Blueberror fights the murderers there and makes them waste time.
Snowdin forest/Underfell[]
The Snowdin forest of Underfell, filled with deadly traps added by the Papyrus of the AU. End!Muffet appears there and begins to kill every Monster she encounters there as well.
Xénotale Void[]
The Void of the sixth eidocide timeline of Xénotale, used by eno for multiple purposes. It is used to put the remnants of eaten foon, such as empty ketchup bottles, in it. It is also used for games.
Royal house/Alternatetale[]
A house in the Waterfall of Alternatetale and the first place Celerity and Choco visit there. It is the home of the king of the Monsters, Asriel Dreemurr, and his two twin children, Asgore and Toriel.
Snowdin forest/Alternatetale[]
The Snowdin forest in Alternatetale contains a rostrum.
Blank universe 96100[]
The blank universe 96100 is the universe Error404!Sans sent XGaster in to battle Cross!Sans and Cross!Chara.
Blank universe 517222[]
The blank universe 517222 is the universe Error404!Sans sent Syno!Sans in to fight Before!Chara.
Blank universe 265712[]
The blank universe 265712 is the universe Error404!Sans sent Frostscreen!Sans and Overcorrupt!Sans to fight Crisk and Neg.
Blank universe 1429901[]
The blank universe 1429901 is the universe Error404!Sans sent Psyka and NewLie to fight against each-other, under Zeno and Celerity!Sans's watch. However, none of them stays there for a long time.
Waterfall/Sangtale[]
The Waterfall of Sangtale is not much different from the one of Undertale, but it contains a teleportation point to the New Home of the AU. Purity likes to go there first.
New Home/Sangtale[]
The New Home of Sangtale is inhabited by the queen of the Monsters, Aiko, and her son, among other Monsters. It is easily accessible via many teleportation points. There are multiple places in New Home where people can hide, and Out!Codes use them with ease.
Television stuido/Sangtale[]
The television studio is mostly used by Mettaton to record his shows. It is also used by Aiko to record her speechs, though she hates to do it.
Royal laboratory/Sangtale[]
The royal laboratory is the place Alphys works in. She blows it up when she dies, allowing for the royal guard to know of the presence of Out!Codes in the AU.
Ruins/Upsilontale[]
When Celerity!Sans and Alpha!Sans go in Upsilontale, this is where they reunite with each-other. This is also where they reunite with Upsilon!Frisk and the last place they go to before leaving the AU.
Flower bed/Upsilontale[]
The place Frisk falls on in Upsilontale. She uses this place as a rest area at the beginning of a run, before meeting her Flowey.
Waterfall/Upsilontale[]
A land of water in the Underground, where Upsilon!Undyne lives.
Last Corridor/Upsilontale[]
The last corridor is illuminated by the stained-glass windows and has gold-colored floor. It is where Upsilon!Sans's judgement happen, regardless of whether it is Upsilon!Frisk's or not.
Toriel's house/Upsilontale[]
While Toriel usually lives alone in her house, by the past, she tried to sequestrate the Humans that fell in the Underground inside it, though she failed.
Ruined city/Undertale: The Ultimate Timeline[]
A city in Krasmein's origin AU, where he hides when he comes back inside it. Apparently, this city is in ruins because of a recent fight in the AU. When Krasmein is finally beaten, the red man repairs the city.
Space/Infinitetale[]
The space in Infinitetale is very similar to that of Outertale. It sparks many comparisons with Outertale, though it is not stated to be as beautiful as the one as Outertale. Humans often travel through it to attain other parts of their galaxy. This is also the place Alpha!Sans and Pandora!Ink fight.
Judgement hall/Infinitetale[]
In Infinitetale, unlike in most other AUs as stated by the protectors, the last corridor is called the judgement hall. It is one of the last remaining parts of the planet that has not been fully destroyed. Pandora!Ink likes to stand on top of it during the story.
Blank universe 480516[]
One of the twin blank universes. Erased from existence by Zeno and brought back, it is used as an example of Zeno's power. It is apparently a very well-known blank universe. It apparently spawned in front of the protectors.
Blank universe 480517[]
One of the twin blank universes. Erased from existence by Zeno and brought back, it is used as an example of Zeno's power. It is apparently a very well-known blank universe. It apparently spawned in front of the protectors.
Miscellaneous[]
- If the Multiverse has too many AUs, it will collapse on itself.
- The Multiversal Void has sound particles, allowing people to hear. Out!Codes theorize that they also allow people to breathe in it, though whether or not it is true is actually unknown.
- The Undertale universe is the first one to have ever existed. Between this moment and the formation of Alphatale, the first AU, 46 blank universes have formed.
- It is known by the protectors due to the theory of the ages of the universes, that was written by Pandora!Ink and Skell's current boss, and then shared with the protectors. The protectors hide the existence of the paper the theory is written on.
- Since the speed of time flowing is different in the universes compared to the Multiverse, the Out!Codes are prevented from aging unless they originate from the Multiversal Void or from an Anti-void.
- EXP and LOVE exist even in codeless universes, since EXP is a specific form of matter that is given by killing, and since the LOVE is given by having enough EXP. When someone is at LOVE 1, they either have a very low quantity of EXP or only have EBM, for EXP's Basis Matter, which turns into EXP when transferred to another person, more often by a kill. Someone who lacks both EXP and EBM has a LOVE of 0.
- When the owner of an anti-void dies, someone else can claim it afterwards. Claiming an anti-void is a simple three seconds-long thought process. It also is possible to unclaim an anti-void.
- The word genocide isn't used throughout the Multiverse. The Out!Codes and inhabitants of the AUs use the word "eidocide" instead.
- The naming of AU inhabitants and Out!Codes is regulated by the standard naming protocol, a system invented by the protectors to make the way someone is called the same for all Out!Codes. Someone is allowed to get their own custom Out!Code name before meeting the protectors, of if their origin AU is unknown.
- Due to their lifestyle in the Multiverse, the Out!Codes rarely express their emotions. They believe that it can kill them. The longer they have been Out!Codes, the less they may show strong emotions.
- The Eye attacked the Undertale universe to destroy it 6000 years before the current events of Undertale Psi. To stop it, an alliance has formed, that eventually sealed the Eye in blank universe 24.
Story[]
- Episode 1 - Reunion
- Episode 2 - The audience
- Episode 3 - The cult of Chaos
- Episode 4 - Determination
- Episode 5 - Celerity's investigation
- Episode 6 - A good discussion
- Episode 7 - Back in Determinatale
- Episode 8 - The resistance
- Episode 9 - An unknown place
- Episode 10 - Explanations
- Episode 11 - The plan
- Episode 12 - New powers
- Episode 13 - Discoveries
- Episode 14 - Lack of code
- Episode 15 - Face-off
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Gallery[]
Trivia[]
- A few canon elements of AUs that aren't made by the author of Undertale Psi are first shown in Undertale Psi. Those are:
- Hotland is called Coldland in Icetale.
- Nashi Masuku has a soul of deceit.
- The way the soul works for him and the way he got it are not canonical information.
- Skell has full control over Upsilontale.
- G's goal is revealed.
- Crisk is very unlucky.
- The royal guard is much more militarized in Vĕdomitale.
- Choco's existence and background are revealed.
- Aiko has a son.
- Upsilon doesn't like to tell his name to other Out!Codes.
- There are a lot more routes in Upsilontale than in Undertale.
- Alongside Ink!Sans, Error404!Sans is one of the characters that received the most modifications for Undertale Psi.
- Because of the writing of Undertale Psi and its characters, the author has been given two AUs, those AUs being Puritytale and Cheattale Prime.