Nobody knows where Broozer came from. Nobody knows what species he is. Nobody knows what his real name is. The reason nobody knows is because Broozer doesn't talk about his past. Heck, Broozer doen't talk. Period. Whether he can't or just chooses not to......nobody knows! Folks just call him Broozer because ...well..he's such a bruiser.
People ask too many questions: He punches 'em!
People chew too loud: He punches 'em!
People attack him or his shipmates: He shoots 'em with that big friggin' home-made cannon of his.
That Broozer. He's wacky.