Osamu Dazai Personality: A Suicidal Genius

Updated: Monday, December 22, 2025

MBTI

ENTP

Enneagram

7w8

Alignment

Chaotic Neutral

Osamu Dazai is a former executive of the Port Mafia, a notorious criminal organization, and a current member of the Armed Detective Agency, a group of supernatural detectives. He is also the partner and mentor of Atsushi Nakajima, the protagonist of the series.

Osamu Dazai's Personality

Osamu Dazai is a suicidal, cunning, eccentric, charismatic, and mysterious person. He has a strong fascination with death and often attempts to kill himself in various ways, such as drowning, hanging, or jumping off a building. He even carries a book titled “No Longer Human”, which is a reference to a novel by the real-life Osamu Dazai, who committed suicide after writing it. However, his suicide attempts are always thwarted by his friends or enemies, much to his disappointment.

Dazai’s suicidal tendencies stem from his traumatic past, which shaped his initial personality. He was born into a wealthy and influential family, but he was neglected and abused by his parents, who considered him a curse. He was also experimented on by a mysterious organization, which gave him his supernatural ability, “No Longer Human”. This ability allows him to nullify any other ability by touching the user. Dazai hated his ability and his life, and he wished to die.

Dazai joined the Port Mafia at a young age, hoping to find a place where he could belong and die. He quickly rose through the ranks, becoming one of the most feared and respected executives. He was known for his ruthless and strategic mind, as well as his charisma and charm. He was able to manipulate and deceive anyone, even his allies and enemies. He was also loyal to the leader of the Port Mafia, Ougai Mori, who saved his life and gave him a purpose.

However, Dazai eventually became disillusioned with the Port Mafia and its violent ways. He realized that he was not living, but merely surviving. He decided to betray the Port Mafia and join the Armed Detective Agency, a group that values human life and justice. He hoped to find a new meaning in his existence and a reason to die.

Dazai’s personality changed significantly after joining the Armed Detective Agency. He became more cheerful and playful, often joking and teasing his colleagues. He also developed a close bond with Atsushi Nakajima, a young orphan who possesses the ability to transform into a tiger. Dazai saw himself in Atsushi, and he decided to mentor him and help him overcome his insecurities and fears. Dazai also showed a softer and kinder side, as he cared for his friends and protected them from harm.

However, Dazai still retained his cunning and mysterious nature, as he often acted behind the scenes and kept his true intentions hidden. He also maintained his contacts with the Port Mafia and other organizations, using them for his own goals. He was also still obsessed with death, and he searched for a worthy opponent who could kill him. He believed that the only person who could do that was his former partner and friend, Chuuya Nakahara, who possesses the ability to manipulate gravity.

Dazai is a complex and contradictory character, who struggles with his own identity and purpose. He is a genius who can outsmart anyone, but he is also a fool who wants to die. He is a traitor who betrayed his former comrades, but he is also a friend who cares for his new ones. He is a human who can nullify any ability, but he is also a monster who can destroy anything.

Relationships

Atsushi Nakajima: Dazai's protégé and ward. He rescued him from starvation and recruited him into the Agency. He helped him to discover and control his ability, and he taught him the values and principles of the Agency. He cared deeply for him, and he considered him as his successor and his hope.
Doppo Kunikida: Dazai's partner and friend. They worked together as detectives in the Agency. They had opposite personalities and styles, but they respected and trusted each other. They complemented each other's strengths and weaknesses, and they solved many cases together. Dazai admired Kunikida's ideals and morals, and he supported him in his goals.
Chuuya Nakahara: Dazai's former partner and rival. They were partners and executives in the Port Mafia. They had a competitive and hostile relationship, but they also had a mutual respect and trust. They were the only ones who could activate their combined ability, Soukoku, which made them a formidable duo. They parted ways when Dazai left the Port Mafia, and they became enemies and opponents.
Sakunosuke Oda: Dazai's friend and mentor. He was a fellow member and executive of the Port Mafia. He was a gentle and kind-hearted man who hated violence and killing. He was Dazai's closest friend and confidant, and he often gave him advice and guidance. He was the only one who understood Dazai's pain and loneliness, and he tried to help him find a reason to live. He was killed by a traitor, and his last words to Dazai were to leave the Port Mafia and find his own path. He was Dazai's inspiration and motivation, and he influenced his decision to join the Agency.

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