Contrary to his name Bruce doesn't actually do much brooding or crime fighting. He likes to think he does, often getting into 'epic' battles with such scary villains as the broom and the vacuum in order to 'rescue' his handler from their tyrrany. With his brothers he shows an almost puppy-like playfulness that he tries to hide from pretty much anyone that's not his brothers or his handler. He's rather tender when it comes to younglings of any species having the patience of a saint as they clambor over him or nip at him. If they do go too far he will give them a reprimand (what that entails varying depending on if they're human or not) to let them know their boundries.