Something about his design, in dark and light, is incredibly terrifying to me. Being scary outside of the game is something few characters manage to do. Something about his appearance, possibly his endoskeleton being very visible, or his ripped skeleton, sends shivers down my spine. Him and withered Chica are my top two. Front runners in my ranking include: OG foxy (look how he runs!) nightmare fredbear, OG freddy (something about him is super creepy in game. Maybe his non power out Jumpscare being so different from the rest) withered Bonnie, most of the fnaf SL animatronics, (besides Ballora and Circus Baby which I honestly can’t stand for some reason) and I guess spring trap. OG Bonnie’s okay I guess but I don’t find him as scary as others. Mainly because I’ve played fnaf 1 so much and been annoyed by him and never really actually killed by him in an unexpecting way due to figuring out how to play relatively fast.