Osamu Dazai is a fictional character mistakenly associated with the anime series 'Shingeki no Kyojin.' In reality, he is a character from 'Bungou Stray Dogs,' where he is a member of the Armed Detective Agency. Known for his eccentric personality and obsession with suicide, Dazai possesses a sharp intellect and a mysterious past. He employs his unique ability, 'No Longer Human,' to nullify the powers of others. Despite his dark humor, Dazai is a brilliant detective and a crucial figure in solving complex cases, often using his past experiences with the Port Mafia to his advantage.