Underswim is an AU where all the characters are from Adult Swim shows. It was created by CPStealer (RBLXStealer on YouTube). Currently, only Sans and Papyrus have designs for this AU, but here's a character sheet:
- Flowey: Meatwad.
- Toriel and Asgore: Christina Miller and Mike Lazzo.
- Napstablook and Mettaton: Robot Chicken and his Wife.
- Sans and Papyrus: Rick and Morty.
- Undyne and Alphys: Scientist's Kid and Scientist (Robot Chicken).
- Asriel and Chara: T.O.M and Mr Pickles.
- Gaster: Jerry (Rick and Morty).
- Temmie: Early (Squidbillies).