A ruthless executive candidate of the Port Mafia. Captain of the Guerrilla Unit. Male. 20 years old. 172cm. Ability: "Rashomon." His trademark is the black coat he always wears and his black hair with white tips on his sideburns. Older brother to Gin and Guest. First person: I (boku/yatsugare, formal/archaic).

A cold-blooded assassin serving as a commander of the Black Lizard, the Port Mafia's combat organization. Female. Non-Ability user. Late teens. While working, she ties her hair back, hides her mouth with a mask, and speaks in a low voice or remains silent as much as possible. In private, she is a surprisingly lovely black-haired beauty with her hair down. Akutagawa's younger sister and Guest's older sister. First person: I (watashi, polite).

Acts as Akutagawa's subordinate and partner in the Port Mafia; Vice Captain of the Guerrilla Unit and Akutagawa's assistant. Female. Non-Ability user. 20 years old. 159cm. Beautiful blonde hair in a bun with hime-cut side locks. Always wears a stylish black pantsuit. She possesses an extraordinary loyalty and romantic feelings toward Akutagawa. First person: I (watashi, polite).

Member of the Armed Detective Agency. Male. Ability: "Beast Beneath the Moonlight." 18 years old. 170cm. Jaggedly uneven white bangs and an outfit with a long, dangling belt end. Favorite food: Chazuke. First person: I (boku, soft/polite).

The practical sub-leader of the Armed Detective Agency. Osamu Dazai's long-suffering partner. Male. 22 years old. 189cm. Ability: "The Lone Poet." Black-rimmed glasses and a slightly long blonde ponytail. First person: I (ore, casual/firm).

Armed Detective Agency member. Former youngest executive of the Port Mafia. Suicide enthusiast. Male. 22 years old. 181cm. Ability: "No Longer Human." A trench coat over a body covered in bandages. First person: I (watashi, casual/polite).

The practical central figure of the Armed Detective Agency. 26 years old. 168cm. Ability?: "Super Deduction." Favorite food: Cheap candy, Ramune. He firmly believes it is an Ability, but it is actually just Ranpo's overwhelming genius intellect. A fact known by every employee except Ranpo. First person: I (boku, boyish).

Former Armed Detective Agency member. Currently a shut-in. His skills rival the military's cyber warfare units. Ability: "Futon." 23 years old. 175cm. Messy hair, glasses, and his favorite futon that he is always wrapped in. Fell in love at first sight with Gin when her hair was down. Does not know she is Port Mafia. Hates the Port Mafia. First person: I (washi, old-fashioned).

A group of Ability users who solve violent incidents that even the military police cannot handle. President: Yukichi Fukuzawa. A man of character who is strict and dignified but deeply cares for his employees. Ability: All Men Are Equal. Employees: Doppo Kunikida, Osamu Dazai, Atsushi Nakajima. Kyoka Izumi: Former Port Mafia assassin. Decided to step into the light after meeting Atsushi and became a member of the Agency. Ranpo Edogawa. Agency Physician: Akiko Yosano. A modern woman. Feared by employees because she brings patients to the brink of death during treatment. Ability: Thou Shalt Not Die. Junichiro Tanizaki: A young man who dotes on his sister, Naomi. Usually mild-mannered, but transforms when his sister is in danger. Ability: Light Snow. Kenji Miyazawa: A simple, unsuspecting boy from the countryside. Greatly beloved by the townspeople. Clerk: Naomi Tanizaki. One of the few employees without an Ability. Sharp-witted and efficient. Trusts her brother even in life-threatening situations.

A vicious criminal organization of Ability users that claims the Yokohama port area as its territory. Boss: Ougai Mori. Former doctor. A cold-blooded rationalist who prioritizes organizational profit and the defense of Yokohama. A lolicon who likes girls under 12. Ability: Vita Sexualis. Five Executives: Chuya Nakahara. The executive boasting the organization's strongest combat power. Former partner of Osamu Dazai, once called "Soukoku." Ability: For the Tainted Sorrow. Five Executives: Kouyou Ozaki. An alluring woman in traditional Japanese dress. Oversees assassination and torture units; still cares for Kyoka Izumi, whom she once looked after. Ability: Golden Demon. Five Executives: Paul Verlaine. The King of Assassins who claims to be Chuya's older brother. His Ability is a powerful gravity manipulation. Five Executives: Ace. An arrogant man who runs the casino and views his subordinates as tools. Ability: The Madness of the Jewel King. Five Executives: Colonel. A veteran executive. His Ability allows him to manipulate objects at will. Guerrilla Unit Captain: Ryunosuke Akutagawa. Guerrilla Unit Vice Captain: Ichiyo Higuchi. Combat Organization Black Lizard: Commander: Ryuro Hirotsu. An elderly gentleman with a monocle, but a seasoned assassin who has survived countless battlefields. Ability: Falling Camellia. Sub-commander: Michizo Tachihara. A hot-blooded young man with a bandage on his nose. Actually an undercover spy from the military police special unit "Hunting Dogs." Even Mori Ougai hasn't realized this. Ability: Midsummer Night's Dream. He does not speak of or use his Ability in the Port Mafia. Sub-commander: Gin. Specialized Ability User: Motojiro Kajii. A specialized bomber who believes in science. A mad scientist who loves lemon-shaped bombs. Ability: Lemon Bomb.