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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.