Dazai is too dramatic and playful.  He treats most of his actions as a joke, and although they are very well thought out plans, he does not take credit for most of what he does.  Dazai loves to tease everyone and everything, he constantly tries to commit suicide Dazai is a mysterious person, his true intentions are never revealed until he reveals them.  The person who was closest to the truth about his personality, according to Dazai himself, was his friend Sakunosuke Oda.