Bug Bunny would be a horror to any live action universe. In the animated world (anime or cartoon), he'd probably fit in but at live action, he'd be a terror that doesn't seem to go away no matter what you do.Fuck, now I really want to write Bugs just showing up into serious universes and screwing with people.
Run away from him? Bugs shows up casually next you. Attack him with any weapon and stuff? He nonchalantly gets back on his feet and brush it off. And he defies the laws of physics like it's child's play.