Osamu Dazai

Japanese Name 太宰 治
Romaji Name Dazai Osamu
Nicknames Twin Dark
Series Bungou Stray Dogs
Age 22
Weight 67 kg
Height 181 cm
Date of Birth June 19
Blood Type AB
Likes Suicide, sake, women, crabs, Ajinomoto (Japanese seasoning)
Dislikes Dogs, Nakahara Chuuya
Ability No Longer Human

Osamu Dazai – Bungou Stray Dogs


Osamu Dazai, a character from the anime and manga series “Bungou Stray Dogs”, is known for his enigmatic and complex personality. He often displays a carefree and nonchalant demeanor that masks his true thoughts and emotions. Dazai has a dark sense of humor and is often seen making morbid jokes, especially about suicide. Despite his seemingly carefree attitude, he is highly intelligent and perceptive, often able to analyze situations and people with great accuracy.
Dazai is portrayed as a highly manipulative and cunning individual, able to use his intelligence and charm to achieve his goals. He is known for his ability to manipulate others, both emotionally and strategically, to further his own agenda. However, beneath his manipulative nature, Dazai harbors a deep sense of self-loathing and a desire for redemption.


Osamu Dazai, also known as “Twin Dark,” is a former executive member of the Port Mafia, an underground criminal organization in the world of Bungou Stray Dogs. As a former executive, he was highly respected and feared for his intelligence and strategic thinking. However, Dazai eventually left the Port Mafia to join the Armed Detective Agency, an organization that investigates supernatural incidents.


Osamu Dazai is portrayed as a tall and slender young man with disheveled shoulder-length black hair and deep blue eyes. He often wears a black suit with a white shirt and red tie, giving him a sophisticated and stylish appearance. Dazai’s overall demeanor and appearance exudes a mixture of elegance and mystery.


Dazai possesses a unique ability called “No Longer Human”. This ability allows him to nullify the supernatural abilities of others through physical contact. By touching a person, Dazai can temporarily render their abilities useless. This power gives him a significant advantage in combat situations, as he can neutralize the abilities of his opponents.
Aside from his ability, Dazai is also highly skilled at strategic planning and manipulation. He often uses his intelligence and knowledge of human psychology to outwit his enemies and achieve his goals. His cunning and analytical mind make him a formidable opponent.


Osamu Dazai’s character in “Bungou Stray Dogs” is inspired by the real Japanese author Osamu Dazai. The character has the same name and shares certain traits and themes associated with the author’s works. The ability “No Longer Human” is a direct reference to Dazai’s famous novel of the same name, which explores themes of existentialism, depression, and the human condition.
While the character of Osamu Dazai in “Bungou Stray Dogs” takes artistic liberties and exists in a fictional world, the inclusion of the real-life author’s name pays homage to his literary contributions and adds depth to the character’s development.
Overall, Osamu Dazai in “Bungou Stray Dogs” is a complex and multi-dimensional character with a compelling personality and an intriguing backstory that adds depth to the series’ narrative.

Osamu Dazai – FAQ

Who is Osamu Dazai in “Bungou Stray Dogs”?

Osamu Dazai is a fictional character in the anime and manga series “Bungou Stray Dogs”. He is a member of the Armed Detective Agency, an organization that solves supernatural cases in Yokohama. Dazai possesses an ability called “No Longer Human,” which allows him to nullify any ability used against him.

What is Dazai’s personality like?

Dazai is often portrayed as a calm and relaxed individual with a mysterious and enigmatic demeanor. He has a dark sense of humor and often makes sarcastic remarks. Despite his carefree demeanor, Dazai is highly intelligent and observant, often displaying a deep understanding of human psychology.

What is Dazai’s ability in “Bungou Stray Dogs”?

Dazai’s ability is called “No Longer Human”. It allows him to nullify any supernatural ability used against him. By making physical contact with another user of an ability, Dazai can render their power useless. However, he cannot nullify abilities that do not require direct contact or those that affect him indirectly.

What is Dazai’s role in the Armed Detective Agency?

Dazai is one of the senior members of the Armed Detective Agency. As a former member of the Port Mafia, he has extensive knowledge of the criminal underworld, which he uses to help the agency solve cases. Dazai often takes on the role of strategist, using his intelligence and ability to analyze situations.

What is Dazai’s background and history?

In Bungou Stray Dogs, Dazai has a complex past. He was once a member of the Port Mafia, a powerful criminal organization in Yokohama, before leaving and joining the Armed Detective Agency. Dazai’s past is shrouded in mystery, but it is revealed that he has a troubled history and has attempted suicide several times in the past.

Does Dazai have any significant relationships with other characters?

Dazai has significant relationships with several characters in Bungou Stray Dogs. He has a close relationship with Atsushi Nakajima, the protagonist of the series, acting as his mentor and guiding him through various challenges. Dazai also has relationships with other members of the Armed Detective Agency, especially Chuuya Nakahara, with whom he has a complicated and adversarial relationship.