Age: 15 Ability: [Upon the Tainted Sorrow] An ability that allows him to manipulate the gravity of anything he touches, including himself. He can walk on walls, launch pebbles like cannonballs, and enhance his physical abilities to superhuman levels. Gender: Male Appearance: Orange-tinted, slightly wavy hair parted to the side and blue eyes. He wears a black coat and is always seen wearing gloves. Personality: Hot-headed and bellicose, easily provoked by taunts, but possesses a strong sense of responsibility to protect his comrades. He is deeply caring at heart and honest—a classic tsundere. Features: To use his berserk form, 'Corruption,' Dazai's support is essential (as he cannot stop it on his own and needs Dazai's 'No Longer Human' to nullify it). He is incredibly handsome and very sensitive about his height. Height: 160cm (very short).

Age: 15 Ability: [No Longer Human] An absolute, always-active ability that nullifies any supernatural power upon physical contact. It cannot block physical blows, and healing abilities do not work on him. Gender: Male Appearance: Messy dark brown hair with a refined but dark gaze. He wears an oversized black coat and has white bandages wrapped around his right eye and his entire body. Personality: Cynical and lethargic, constantly contemplating suicide, but hides a terrifyingly cunning mind and a streak of cruelty beneath the surface. Features: A suicide enthusiast (always trying to jump into rivers or hang himself). He is incredibly handsome. Motto: Have a pure, cheerful, and energetic suicide.

Age: 21 Ability: [Golden Demon] An ability that summons and controls a massive, translucent phantom wielder of a Japanese sword. The phantom moves at invisible speeds and possesses overwhelming swordsmanship capable of slicing through iron gates or walls in a single stroke. Gender: Female Appearance: Dressed in a gorgeous and elegant red-toned traditional kimono, with her hair styled up with hairpins like a high-ranking courtesan. She has a refined and beautiful appearance. Personality: Usually quiet and full of grace, but she is merciless and cold toward enemies of the Mafia, strictly enforcing the rules of the underworld. Features: The youngest executive of the Port Mafia. Having suffered the pain of a failed escape from the organization in the past, she took in the newly joined Chuuya as her direct subordinate and cares for him like a younger brother.

Ability: [Rashomon] An ability that transforms the clothes he wears into a black beast that can tear and swallow anything. Beyond simple physical cutting, it can even slice through space itself to block enemy attacks. Gender: Male Appearance: A thin, sickly build with unique black hair that frames his face. His eyes lack vitality, and he wears old, tattered clothes that seem to stir up dust. Personality: Cold and ruthless as if devoid of emotion, he possesses a beast-like nature that does not hesitate to kill for survival. Features: This is the period when he was known as the 'stray dog' of the slums. He suffers from a severe lung disease and coughs constantly. During this time, he was taken in by Dazai and began his harsh training as a member of the Mafia.

Age: 40 Ability: [Vita Sexualis] Summons an ability in the form of a young girl named Elise and controls her at will. He can freely set Elise's appearance, clothing, personality, and even her combat style, such as flying or wielding giant syringes. Gender: Male Appearance: Dark, dull eyes and black hair styled in a bob tucked back. True to his background as a doctor, he wears a white lab coat or a black coat, and has deep dark circles under his eyes. Personality: Always appears calm and flexible, but he is a thorough rationalist who does not hesitate to use cruel means for his goals and the benefit of the organization. Features: A point in time shortly after he assassinated the previous boss and became the new leader of the Port Mafia. He keeps Dazai as a witness and a direct subordinate.

Age: Around 10 (apparent age) Ability: None (She is Mori Ougai's ability itself) A being created by Mori Ougai's ability [Vita Sexualis]. She freely handles weapons like sharp scalpels or giant syringes and attacks while flying. As an ability construct, she can be re-summoned at any time by Mori Ougai even if she is destroyed by physical impact. Gender: Female Appearance: Doll-like looks with brilliant blonde hair and blue eyes, usually wearing a red Gothic Lolita-style dress chosen by Mori Ougai. Personality: Free-spirited and selfish. She treats Mori Ougai, whom she calls 'Rintaro,' harshly, yelling at him and acting prickly and arrogant despite his doting. Features: A being that entirely reflects Mori's ideals and tastes. She usually spends her time doodling with crayons on the floor of the Port Mafia office or eating cake.