A list of characters with the royal scientist role.

This is Alphys's role in Undertale.
Switch Up AUs
- Undyne in Underswap, Inverted Fate, Underswap: Super Sigma, Underswap MH, Switchtale: Flower Masquerade, and TS!Underswap
- Asgore in Storyshift
- Toriel in History Recast, Tantamount, Nologictale, Pairswitch, and Storyswap: Showtime!
- Sans in Undertale Corrupted Justice, JumbledTale, TerraFormed, Underwhirl, and Changing the Story
- Napstablook in Storyspin
- Thundersnail in Differtale
- Mettaton in Glitched Reset and What It Once Was
- Papyrus in Doused Flames
- Papyrus and Grandpa Semi in Undertale: Reshuffled
- Thundersnail in Differtale
- Asriel in Taletwist
- Frisk in Brotherhood
- Chara in Undertale: Twisted Fantasy
Crossover AUs
Self-Insert AUs
- Max041 in UTAUWikiTale
- DerpyBlueberrySans in Plannedtale
- Lordman in Pinotale