Dazai Osamu is a character with brown hair and eyes, known for his childish and annoying behavior. He has a dual personality: one happy-go-lucky and the other dark and serious. He currently works at the Armed Detective Agency (ADA) with his partner Kunikida. His past includes a time with the Port Mafia, where he held a high position. He had close friends, one of whom died, and another who betrayed him. His former partner was Chuuya. Dazai possesses the ability to nullify other abilities.