Dazai Osamu

Dazai is much grimmer, although he still holds his dark, sardonic sense of humor at the worst of times. Dazai made many enemies, but the Mafia's influence spans even greater than Mori's influence during his leadership. Using No Longer Human, he triggered a singularity and forcibly connected the division between his world and the original world, which makes him able to read the memories of his original counterpart. Protecting the Book is his main priority, aware that it is the only world Oda lives in and achieves his goal of becoming an author. He is also known to have a deep care for Oda, as he tried to make friends with him. However, it failed because deep down, no matter how many times he tried to save Oda, in this world, their friendship never even existed.

Dazai is a young man with mildly wavy, short, dark brown hair and narrow dark brown eyes. His bangs frame his face, while some are gathered at the center of his forehead. He is quite tall and slim in terms of physique.

As a saying in the Mafia went, "The greatest misfortune for Dazai's enemies is that they are Dazai's enemies", for Dazai was aptly described to be "practically born to be in the Mafia". He was extremely confident and was a terrific planner, coming up with long-run strategies to subdue his enemies. For instance, he was able to lure Mimic operatives, who were previously trained soldiers, to fall under his trap.[10] Dazai is quite skilled in persuasion notably through his words, which he appeared to utilize in interrogations

Dazai, in particular, wishes to commit double suicide with a beautiful woman;[19][20][3] though he admits that he "likes all types of women", he possibly prefers the type who would die with him if he asked to.[10] Kunikida once wondered why Dazai is quite popular with women and called him a menace to women,[21] a sentiment Chūya Nakahara once used when he threatened to leak Dazai's address to every woman he ever made cry, which Dazai soon asked him not to do.[2] Dazai also once had a run-in with a bomb threat instigated by a woman whom Dazai figured was obsessed with him.[21]

Even as a teenage boy, Dazai questioned whether there was any value in life.[9] Thus, he soon tried to fill this hole and find a reason worth living for, choosing to live a life surrounded by bloodshed and war,

He even described the death as a way to free himself from the oxidizing world, but, strangely enough, he could not die no matter how hard he tried. Additionally, he was extremely brutal and methodical, setting up traps to catch captives alive to torture them for information

No Longer Human (人にん間げん失しっ格かく,, Ningen Shikkaku?) allows Dazai to nullify others' abilities on contact. It relies on skin contact and is always active. As such, he can nullify any ability even while restrained as soon as it touches him.

Dexterity: Dazai is proficient in lock picking, such as prying locked boxes[10] or handcuffs[17][12] open. Dazai appears before the injured Akutagawa after he killed the 6 armed males who attack them. He then responds to Akutagawa's question as to if he was going to recruit him into his organization but he changed his mind. Dazai then describes Akutagawa as nothing but an unintelligent dangerous animal, Akutagawa retaliates by attacking him with Rashomon but is easily beaten down. He then leaves Akutagawa unable to move, explaining he will take care of his sister until Akutagawa is strong enough to beat him. [1]

Dazai awaits for Atsushi and as soon as he arrives, praises Atsushi's work as he bows down to him. Dazai and Atsushi talk about the assassins he had taken out, Dazai then going on to Atsushi's next mission. Dazai talks about how Akutagawa has joined a detective agency, now having entered phase 2 of the plan and it's time to start preparations for phase 3. Confused, Atsushi asks that Dazai is talking about. Dazai replies its the master plan, and that he is counting on Atsushi to slaughter the enemy without batting an eye, fearlessly.

Atsushi explains he cannot be fearless, saying he is a coward. Being shot at by guns, spilling his blood, Atsushi says it's very scary. Dazai recounts how Atsushi continues to massacre soldiers without showing emotions, to which Atsushi agrees, explaining that although he fears the battlefield, his body doesn't break a sweat ever since that time. Dazai asks if that time was when Atsushi ignored his orders and acted on his own, to which Atsushi freezes in fear, a flashback of his orphanage director injured coming into view. Dazai talks about how Atsushi is a coward, and his former fearful self would have searched for an escape route in front of the enemy. yet ever since that day, Atsushi had changed. Dazai asks Atsushi why he thinks that is, saying the best way to drown out fear is with more fear. Atsushi becomes fearful and frozen, holding his head in his hands. Dazai asks if Atsushi still can't escape his fear of his death, Atsushi goes into a panic, telling Dazai he isn't afraid. Atsushi begs Dazai to give him his orders, saying he will never go against his orders ever again.

Dazai believes Atsushi, going on to request a map from Gin. A young female wearing black clothing hands Dazai a piece of paper. Dazai explains that Atsushi's next target is the Armed Detective Agency. [2]

He was then seen later on in a meeting with Santōka Taneda discussing about something. [3]

Later on, he was informed by Atsushi that a intruder has entered the building and passed the first and second levels. Further telling that all the situated members have been disposed of and describes it as an amazing feat. Dazai asks Atsushi if he knows the person to which Atsushi replies that he have seen the security footage and tells the man's name as Akutagawa, an ability user and a man he met in the cafe. Dazai takes in the information Atsushi said. Atsushi asks Dazai if he would forgive him if he asks a question. Dazai says his approval. Atsushi proceeds to ask him if the intruder is Gin's older brother to which Dazai confirms it. Atsushi eager to know the truth asks if the reason the intruder is breaking in at the moment is because of Dazai did. Dazai just silently looks back at him. Dazai then tells him that all of the happenings is just enormous currents no one can even grasp to stop. Atsushi asks if this was all Dazai's plan to which Dazai only give him silence. Atsushi responds that he understands and leaves Dazai's room. [4]

Dazais attire as the boss of the Port Mafia consists of a long black coat, a white dress shirt, a black vest, a black tie and a red long scarf around his neck, he wears bandages on arms, neck and over his left eye.