Some purple dude who won't die.
*My friend beating FNAF 3*
My Friend: Omg William Afton just died!
Me: Yep.
My Friend: Now we don't need to worry about him ever again!
Me: Nah he's just gonna re-alive himself.
A fictional character in the hit game, Five Nights At Freddy's Who is responsible for killing 5 children and stuffing them in animatronic suits before himself, was springlocked only to come back again, and again. The last time we saw Afton was in FNAF: Security Breach.
William Afton has to be the most DISTURBING fictional killer.