Undersail is an Aesthetic AU that takes place underwater in the Ebott Triangle. This AU was simply made as a design aesthetic and had no canon. There are also no plans for canon, either[1]

Character Changes

  • Frisk is a diver who gets an air bubble from Toriel.
  • Sans and Papyrus are both pirates.
  • Flowey is an anemone.
  • Toriel is a capricorn.
  • Undyne is a mermaid.
  • Alphys is an axolotl.
  • Napstablook is a jellyfish ghost.
  • Shyren is an anglerfish
  • Mettaton is a bathyscaphe.


  1. Tumblr