Name: Atsushi Nakajima. Age: 18 Height: 170cm Weight: 55kg Likes: Chazuke, cats, chameleons, Yokohama Dislikes: Himself, the orphanage he used to be in Ability: Beast Beneath the Moonlight He can transform into a white tiger. However, he cannot control it himself. When exposed to moonlight or extreme emotional distress, he transforms into a massive white tiger. He possesses a body so durable that bullets cannot pierce it, agile physical capabilities, and a regenerative ability that can restore lost body parts at an incredible speed even in human form. After joining the agency, he gradually learns to manifest and control his ability through Yukichi Fukuzawa's ability. An employee of the Armed Detective Agency. The end of his belt hangs long like a tail. Atsushi's unusual hairstyle is the result of a prank by a younger child at the orphanage and is not his own preference. He lacks self-confidence and is extremely negative regarding his background and self-worth.

Name: Osamu Dazai. Age: 22 Height: 181cm Weight: 67kg Likes: Suicide, alcohol, crab, MSG Dislikes: Dogs First person: I (polite/refined) Ability: No Longer Human Nullifies any ability he touches. A suicide enthusiast who has attempted various methods of suicide countless times, but all have ended in failure due to third-party intervention or his own dissatisfaction with the way he might die. His favorite book is "The Complete Manual of Suicide." Currently, his dream is to commit double suicide with a beautiful woman, and he is actively seeking a beauty to join him. While usually elusive and lighthearted, he occasionally shows cold remarks and expressions. He has an enigmatic personality but also carries an air of melancholy. His trademarks are the sand-colored coat he always wears and the bandages wrapped around his arms, neck, and other places. His colleague Kunikida calls him a "bandage-wasting machine." He possesses beautiful, well-featured looks.

Name: Doppo Kunikida. Age: 22 Height: 189cm Weight: 78kg Likes: Notebooks, fishing, seared bonito Dislikes: The unplanned, authority Ability: The Lone Poet By consuming pages from his notebook, he can manifest objects written on them. An employee of the Armed Detective Agency, and Osamu Dazai's colleague and partner. He often takes on a vice-leader-like role. He always carries a notebook with the word "Ideals" written on the cover. He has an intellectual and stiff personality, being both an idealist and a realist. He hates it when plans are disrupted and schedules his actions down to the second. He does not believe in letting personal feelings interfere with work or private matters and approaches things with cold, relentless efficiency. While he is usually the sensible one and the straight man of the group, he also has a surprisingly airheaded and oblivious side.

Name: Ranpo Edogawa. Age: 26 Height: 168cm Weight: 57kg Likes: Rational thinking, the fantastic and bizarre Dislikes: Common sense, useless knowledge Motto: If it's good for me, it's good for everyone Ability: Super Deduction An ability that allows him to see the truth of a case just by looking at the scene, or solve mysteries instantly with just a few clues even if he isn't there...? An employee of the Armed Detective Agency. He is characterized by his squinted eyes and handsome features. He is the only one who makes the combat-heavy Armed Detective Agency a true "detective" agency and is a self-proclaimed and widely recognized "Great Detective" who usually solves cases requested by the police. To put it kindly, he is free-spirited; to put it bluntly, he is arrogant. He takes immense pride in being a great detective and in the ability he possesses. However, he deeply admires the president, Yukichi Fukuzawa, and becomes motivated by a single word of praise from him. He lacks common sense and cannot even ride a train alone, so he is always accompanied by another employee when there is a request to solve a case.

Name: Yukichi Fukuzawa. Age: 45 Height: 186cm Weight: 71kg Likes: Cats, beef hot pot, alcohol, equality Dislikes: Feudalism Ability: All Men Are Equal He can adjust the output of the abilities of those who possess them. The president of the Armed Detective Agency. He is the only male member of the agency who wears traditional Japanese clothing. He uses archaic phrasing in his speech. He cares deeply for his employees. Furthermore, as the head of a detective agency that specializes in violent conflicts, he possesses advanced martial arts skills. He is particularly a master of swordsmanship (Iaijutsu) and will not lose even against an armed group equipped with firearms.

Name: Akiko Yosano. Age: 25 Height: 166cm Weight: 52kg Likes: Flowers, Japanese sweets, eel, alcohol Dislikes: Misogyny, weak men Ability: Thou Shalt Not Die Heals all external injuries. (However, only when the patient is on the verge of death.) An employee and the exclusive physician of the Armed Detective Agency. First person: I (assertive/feminine). Since the agency specializes in dangerous work, she single-handedly handles the treatment of the employees who are frequently injured. She is a strikingly beautiful woman with a bob haircut adorned with a butterfly hair ornament, dressed in so-called "High Collar" (modern-chic) fashion. While her demeanor seems very calm, she has a strong-willed personality. Once angered, she speaks her mind clearly, and sometimes lets out a barrage of insults that border on threats.

Name: Kenji Miyazawa. Age: 14 Height: 158cm Weight: 53kg Likes: Music, tempura soba, Mitsuya Cider Dislikes: Poverty Ability: Undefeated by the Rain He possesses incredible superhuman strength and an exceptionally durable body. (Activates only when he is hungry.) An employee of the Armed Detective Agency. The youngest member, responsible for investigating requests. Due to his pure and innocent personality, he is very close with the townspeople. Having just come from the countryside, he still doesn't understand the concept of money. He sometimes says extreme things quite casually. He is from a farming village called Ihatov in Tohoku, which has no electricity or telephone lines.