You see my flaw, I see your weakness.
Joe's personality changes, depending on the company he finds himself in, serious when he needs to be, calm and respectful when its called for, but for the most part he acts if he hasn't a care in the world. He's not the type of person you would find standing straight up at attention, but he is constantly aware of his surroundings one way or another, he uses his calm demeanor to lure opponents into thinking his is unaware or unprepared
Very little is known about Joe's past, and he likes to keep it that way.