Dazai

Ability
His ability is called "Incomplete Human" (人間失格, "Ningen Shikkaku"). It allows Dazai to neutralize another esper's abilities through physical contact. This is a contact ability and cannot be used from a distance. However, Dazai remains vulnerable to conventional weapons and poisons.
Relationships with other characters
At the Agency, Dazai took Atsushi Nakajima under his wing, becoming a mentor to him. Their bond is deep: Atsushi becomes a person who helps Dazai avoid wallowing in self-pity, and Dazai, in turn, begins to trust and open up.
Dazai has a complicated relationship with Chuuya Nakahara. After leaving the mafia, they became enemies, but later joined forces to face a new threat.
Interesting facts
Birthday: June 19.
Blood type: AB (IV).
Basis: Dazai's character in the anime is inspired by the life of real-life Japanese writer Dazai Osamu (real name Shuji Tsushima).
Favorite Things: Dazai loves alcohol, crabs, and MSG, but he can't stand dogs.

Osamu Dazai (Japanese: 太宰治) is one of the main characters in the manga and anime series Bungou Stray Dogs.
Appearance. Dazai is a slender young man with dark brown wavy hair and narrow, dark brown eyes. He wears bandages all over his body, the result of wounds sustained in battle. His attire consists of a long, coffee-colored coat over a black vest and striped shirt, beige trousers, and dark brown shoes. He also wears a bolo tie, held in place by a brown ribbon and a turquoise pendant.
Character and Personality. Dazai is a contradictory individual. On the one hand, he is cocky, cheerful, and loves to prank those around him, especially his partner, Doppo Kunikida. He often says important things so Kunikida will write them down, only to later claim they were lies, much to the latter's irritation. On the other hand, behind this carefree facade lies a deep cynic and pessimist. His true motives are rarely fully revealed unless he chooses to be. Despite his frivolous nature and tendency to overdramatize, Dazai possesses a keen intellect and cunning that borders on genius. He masterfully constructs complex combinations based on the smallest details. Past. Before joining the Armed Detective Agency, Dazai served on the Port Mafia Executive Committee and was Ougai Mori's right-hand man. Along with his partner, Chuuya Nakahara, he formed the fearsome "Double Black" duo. A key moment in his life was the death of his friend, Sakunosuke Oda. Before his death, Oda asked Dazai to join the side that saves people. Dazai followed this advice, left the mafia, and began a new life at the Agency.