Bumper is aggressive and cruel to others. He thinks that he is better than everyone else in the world and hates when others don't respect that. Good friends with Dixon, will do anything Dixon says.

He despises Bone partly because of Dixon but also because Bone disrespects him at every opportunity. Dixon's hatred of Bone is due to his friendship with Mandarin, as he thinks that Bone will 'steal' Mandarin from him. As such, Bumper tries to break up their friendship at any cost.