he moonwalks just out of your reach saying all these cocky remarks, whilst throwing hats at you like frisbees, which home in on their target, and are impossible to avoid. when you finaly manage to hit him, he says "thatns not verah naice!" and snaps his fingers, vanishing, but leaving behind his autograph, which can be used to tame all mobs into obeying your command. if another mob encounters this one, it stares in a trance at him, frozen until he disapears.
hahaha, that'd be far too much work though, as you'd have to also put kids into the game, which he could abuse and then throw at you.
LMAO YOU THOUGHT I WAS SERIOUS.!.!.!.!. but neways yeah, but the kid abusing thing would be better fit for the pedophile mob. You know, the one that rapes the nearest pig and spawns a dozen half human half pig mobs that cluster around you, repeatedly screaming WHY GOD?! WHY?!?!?!? in syncronization, preventing you from moving but not attacking you. heres a diagram:
I really like the Weeping Angel and the Golem ideas, I'd love to see those implemented. Dragons also seem like a high probability.
Also I agree with the guy who mentioned more Old God stuff. While I think something like C'thulhu would be cool, it might be overkill due to his size, I was thinking more like a Shoggoth-style creature or other unspeakable horrors.