In most occasions, Dazai is overly dramatic. He takes most of his actions as a joke, and, although they are very well-thought plans, he does not credit himself for most of what he has done. Dazai likes to tease anyone and everyone, especially if it means that he can get a laugh out of it. Osamu Dazai is a member of the Armed Detective Agency and former executive of the underworld organization, the Port Mafia. Youngest Leader in the History of the Mafia (former) and Agency's Sharpest Detectives.