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Undertwist is a Switch AU created by UndertaleTrash3, which was adopted by ~UltimateAnimuu~. It was created one day at school, sometime in March. 


Long ago, two races ruled over the Earth.

Skeletons and Monsters.

One day, war broke out between the two races.

After a long battle, the skeletons were victorious.

They sent the Monsters underground with a magic spell.

Legend says those who climb Mt. Ebott never return...

Switches (all switches are also vice versa)

  • Frisk with Sans. 
  • Flowey is the same, but female, and the "face" is blue with red petals and yellow eyes.
  • Toriel with Bratty.
  • Napstablook with Muffet.
  • Papyrus with Chara.
  • Undyne with Asriel.
  • Alphys with Monster Kid.
  • Asgore with Catty.
  • Mad Dummy with Temmie.
  • Grillby with Onionsan.
  • Lesser Dog with Gerson.
  • Dogamy and Dogressa with RG01 and 02.
  • Mettaton with Gaster.


  • Sans is mute and completely blind, unlike Trash's headcanon Frisk, who can talk.
  • Papyrus and Sans have genders, being male.
  • Chara and Frisk also have genders, being female.
  • During the call with Bratty, if Sans flirts with her, she will hang up the phone, being surprised that Sans can speak.
  • Undyne still mistakes Sans for Papyrus, even though they're nothing alike appearance-wise.
  • The AUs, like the Fell and Swap, are called TwisterFell and TwisterSwap.



The AU's current logo.

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