Replacetale is a switchup AU made by tumblr user TheFunHasBegun and their brothers.


  • Alphys is the role of Flowey. She sends "friendliness lightning", which is actually harmful bullets.
  • Asriel is the caretaker of the RUINs.
  • Sans is a depressed skeleton encountered in the RUINs.
  • Mae is a Sentry in Snowdin, Waterfall, and Hotland, as well as a burger vendor in Hotland. She is the final boss in the Genocide Route.
  • Red wants to capture a human so she can join the Royal Guard.
  • Mettaton wants to see his hero and cousin, Napstablook, in action.
  • Napstablook chases the protagonist throughout Hotland. He is the head of the Royal Guard.
  • Monster Kid is the Royal Scientist, and creator of Papyrus.
  • Undyne is Monster Kid's assistant.
  • Scora was the Royal Scientist before MK, and the creator of the CORE.
  • Papyrus is the star of the Underground, and the brother of Sans.
  • Toriel was a good friend to Asgore before she died. MK managed to bring her back, as a flower.
  • Asgore possesses you in a Genocide Run.
  • Chara is the Ruler of the Underground.
  • Bratty and Catty own a diner in Snowdin, which is Mae's favorite place to eat at.

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