Bungou Stray Dogs character wiki
Osamu Dazai
A guide to Osamu Dazai from Bungou Stray Dogs, covering the character's story, defining traits, abilities, relationships, and role in the series.
Osamu Dazai is a detective in the Armed Detective Agency and a former Port Mafia executive in Bungou Stray Dogs. His ability, No Longer Human, nullifies other supernatural abilities through physical contact.
Overview
Dazai is a strategist who hides careful observation behind jokes, evasiveness, and repeated references to suicide. His move from the Port Mafia to the Agency does not erase his past; it redirects the same intelligence toward protecting people instead of treating them as pieces in a criminal plan.
| Profile | Detail |
|---|---|
| Affiliation | Armed Detective Agency |
| Former affiliation | Port Mafia |
| Ability | No Longer Human |
| Former partner | Chuuya Nakahara |
| Japanese voice | Mamoru Miyano |
Appearance
Dazai is a tall, slim man with brown hair and brown eyes. Bandages cover much of his body, including his neck and arms. At the Agency he wears a tan coat over a vest and bolo tie; his Port Mafia clothing was darker and more formal.
Personality
Dazai is playful, manipulative, and difficult to read. He uses absurd behavior to control a conversation and often withholds the information that explains his decisions.
His pessimism is genuine, but so is the promise he made to use his abilities on the side that saves people. Agency work gives him relationships that challenge the emotional detachment cultivated during his Mafia years.
History
Dazai joins the Port Mafia as a teenager and becomes one of its youngest executives. Paired with Chuuya, he helps resolve the Arahabaki incident and gains a reputation as part of the feared Double Black team.
His friendship with Sakunosuke Oda changes his direction. After Oda's death, Dazai leaves the Mafia, spends time out of public view, and eventually joins the Armed Detective Agency.
At the Agency, Dazai recruits Atsushi Nakajima and helps coordinate responses to the Guild, the Rats in the House of the Dead, and the Decay of the Angel. His conflicts with Fyodor Dostoevsky often unfold as contests between long-term plans rather than direct combat.
Abilities and Skills
| Ability | Application |
|---|---|
| No Longer Human | Nullifies an ability while he is touching its user or effect. |
| Strategy | Predicts multiple responses and prepares layered counterplans. |
| Deduction | Extracts useful motives and patterns from limited evidence. |
| Hand-to-hand combat | Uses practical technique developed in the Port Mafia. |
| Criminal knowledge | Understands Mafia procedure, codes, and negotiation. |
No Longer Human is automatic on contact, making Dazai an effective answer to otherwise overwhelming powers. It does not replace planning, especially when reaching the ability user is itself the challenge.
Relationships
Chuuya Nakahara
Chuuya is Dazai's former partner and frequent rival. Their arguments conceal exceptional combat trust, particularly when Chuuya uses Corruption and depends on Dazai to stop it.
Atsushi Nakajima
Dazai brings Atsushi into the Agency and guides his development. He often teaches indirectly, arranging situations that require Atsushi to choose his own answer.
Sakunosuke Oda
Oda is Dazai's closest friend from the Mafia period. His final request gives Dazai a reason to leave organized crime and protect lives.
Trivia
- Dazai is named after the Japanese author Osamu Dazai.
- His ability is named after the novel No Longer Human.
- He and Chuuya were known together as Double Black.
- His birthday is June 19.
- Mamoru Miyano voices him in Japanese.