Osamu Dazai (太だ宰ざい 治おさむ, Dazai Osamu?) is a member of the Armed Detective Agency and former executive of the underworld organization, the Port Mafia. He has the Ability named No Longer Human.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. For his attire, Dazai wears a long sand-colored trench coat, the belt of which he leaves untied. Under it is a black vest over a striped dress shirt that is light blue in hue. He wears a bolo tie, which is held by a brown ribbon and a turquoise pendant. He also dons beige pants, dark brown shoes, and has bandages wrapped around his entire body; only his face, hands, and feet are left uncovered. Back when he was in the Mafia, Dazai wore a black trench coat that reached under his knees. He also wore bandages over his right eye and his right arm is in a sling—presumably products of his suicidal pastimes. At some point, he was able to regain the use of his right arm.

Chūya Nakahara (中なか原はら 中ちゅう也や, Nakahara Chūya?) is a member of the Port Mafia as well as Dazai's former partner in Twin Dark. He is one of the five Executives in the Port Mafia. He has the Ability named Upon the Tainted SorrowChūya is quite short with a petite, yet muscular build. He has blue eyes, and striking orange hair that frames his face, with a longer section that falls just past his left shoulder. He wears a black hat with a brown hatband and a thin silver chain that hangs over the brim. His outfit consists of a white button-up shirt under a grey vest, a black choker, a black ribbon bolo tie held together with a small silver buckle, an open black cropped jacket with the sleeves rolled up at the elbows, black slacks, a black belt hanging off his right hip and black low-arch shoes. He is almost always seen wearing black gloves. Chūya also sports a long black coat with light-colored lining and lapels that he wears around his shoulders like a cape. The undercoat is a light shade of red. In the past, he wore a black leather jacket with quilted shoulders over a red t-shirt and hoodie. He also wore black pants held up by a black belt with a sheep logo buckle, and brown loafers. A bracelet engraved with the sheep logo could be seen on his right wrist.

Ryūnosuke Akutagawa (芥あくた川がわ 龍りゅう之の介すけ, Akutagawa Ryūnosuke?) is a member of the Port Mafia and has the ability RashōmonAppearance Akutagawa has a slim build and very pale skin. He often covers his face with his hand due to his frequent coughing. He has short, choppy black hair with side bangs that reach his chin and turn white at the tips. His eyes are sharp, somewhat baggy, and a dark empty grey. He wears a long, black coat reaching past his knees over black-fitting pants and black dress shoes. Underneath his coat, he dons a white dress shirt, decorated with a layered ruffled fabric. He also wears a white jabot. When Akutagawa used to live in the slums, he wore dirty and ragged clothes.[6] When on his day off, he wears a simple black coat and frameless tinted glasses.[7] When covered in Rashōmon, the coat fully covers Akutagawa's body, including his mouth.[8] After being bitten by Bram Stoker, Akutagawa has a vampiric appearanceGender Male Male Birthday March 1[5] Age 20 (present)[5] 16 (Dark Era) Height 172 cm (5'8")[5] Weight 50 kg[5] Blood Type A[5] Likes Curios and antiques, tea, figs[5] Dislikes Bonsai trees, dogs, baths, mandarins[5]Ability Rashōmon Reference Rashōmon (Short story by Ryūnosuke Akutagawa) Occupation Mafioso Affiliation Port Mafia