There are Ink the protector of au's and has no au, Error the destroyer of au's and has no au, Swap from Underswap, Dream from Dreamtale, Dust from Dusttale, Killer from Killertale, Horror from Horrortale, Nightmare from Dreamtale, Lust from Underlust, Fresh from Freshtale, Geno from aftertale, Reaper from Reapertale, Outer from Outertale, Cross from Xtale and Fell from Underfell. I don't know the names for the other au's.

You are Nightmare and Nightmare is the leader of the bad guys and the guardian of the negativity apples and the twin brother of Dream.