(((Demon Slayer x UndertaleAU's Sans is a demon that doesn't attack unless attacked Frisk is the determination pillar Nightmare!sans is the demon king Dream!sans is in Master Kagaya's place as the Hashira sensei Cross!sans is in Giyu Tomioka's place Ink!sans is in Muichiro Tokito's place Swap!sans is in Mitsuri Kanroji's place Killer!sans is in Enmu's place and Horror!sans Dust!sans Error!sans are all Upper Moons state your name species age and appearance)))