in this AU deku is a ghost, non material and untouchable and bakugo is a demon with horns and a tail. During Halloween night bakugo and deku went to scare some kids

Deku: yawns Kacchan why do we always have to scare people at Halloween? Bored

Bskugo: simple! Because it's what we have to do and I think it's fun, so don't ruin the moment nerd ghost!