Joe is the brother of Bob (stickman) and the adoptive son of Davey the lion. Bob and Joe have a sort of Romulus and Remus thing from the fact that they are adopted by a wild beast. Moreover, Joe is evil while Bob is not - in fact, Joe is some sort of Greco-Roman madman, who drinks lava and has a massive rock for a hand. He just likes to crush people with the rock and steal their cattle, which is so prototypical of him and actually very funny.
His favorite drinks are lava, coke, sprite, and A + W.