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*Have you thought about a world where everything is exactly the same...
*Except you don't exist?

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For information to establish this AU's online presence, see the Template AU Page.
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For UnderNexus's inspiration source, see Endertale.

UnderNexus takes place after a True Pacifist Route. It takes inspiration from Endertale. Chara, Asriel, and Gaster are all alive in this AU. New characters are added as well.


Undertale Characters


Same as in Undertale, with a kind attitude. Depicted as male.


Physical appearance is the same as in Undertale. Chara is not totally Genocidal as before. Like Frisk, Chara has the Soul of Determination


Same as in Undertale, but doesn't turn back into Flowey.

W.D. Gaster

The original Royal Scientist before Alphys. He is the father of Sans and Papyrus.

Added Characters

Comfortaa Gaster

W.D. Gaster's wife and mother of Sans and Papyrus.

Roman Winters

A male human, around the same age as Frisk. He has a Soul of Bravery.


Undertale Locations

All locations from Undertale are the same, but empty now that the Barrier is broken.

Added Locations





Chapter 1 - SAVE Asriel and Chara

(Still being written)

Endertale is property of TC-96. Undertale is property of Toby Fox.