Like those horror stories from Japan where the killers are obsessed with the innocent character, that might work
More like puppet combo you know? like the killers are armed with Melee's or guns....they wear formal or seasonal outfit....they're mask are uncanny or straightfoward....and they're Tragic and horrible backstory or just simply a wacky one.....like they have they're own intentions....Cult or not cult.....delusional or not or just simply want to be known as a killer