Frisk is the same but with 3 pieces of bubble gum in their hair and a shirt with a mud splat on it.
Chara = Mr. Clean
Sans = Alsnapz
Papyrus = ImaginaryZ
Toriel = Sierra (from panftr)
Asgore = Raiy (from panftr)
Alphys = Dr. Dashley/darkdeathgrace
MTT = Xith (from Dr. Dashley's Monster Madness)
Asriel = Liz (from panftr)
Mad Dummy = Anubis (from DDMMS)
Napstablook = Illumoa (from panftr)
Ruins Dummy = Fregley (from Diary of a Wimpy kid)
Undyne = That Guy from "My butt goes..."
Everyone else is unaltered, except for weird stuff on their clothing/skin/fur.