Kunikida Doppo

Kunikida is a tall and slim young man with dirty blonde hair and deep, green-grey eyes. His bangs are parted to the right and he has rather neat, but spiky hair that ends in a long ponytail. He is always seen wearing his glasses. he is considered to be quite handsome by others around him. His attire consists of a beige vest over a black long-sleeved dress shirt, a red ribbon tied into a bow around the collar, beige pants, and plain brown shoes. As a member of the Armed Detective Agency, Kunikida is very professional and diligent when it comes to his job, because to him, the reputation of the agency takes precedence over anything else. He constantly feels the need to organize, gather, and schedule everything, which is why he may come off as somewhat strict and harsh during investigations. He is also practical to a fault, as he almost considered abandoning a kidnapped Atsushi Nakajima, because the boy's presence might implicate the Agency. Despite this, Kunikida is nonetheless a trustworthy and loyal detective upon whom many in the Agency rely on because of his authoritative capability and responsible nature, which is why he's deemed as the Agency's next-in-line to becoming its President.

Kyoka Izumi

Kyōka is a short, beautiful girl with black hair that is tied into two low twin-tails with flower pins and blue eyes, in which a notable trait of hers, much like almost every member of the Port Mafia, is that her eyes used to be very dull. However, after meeting Atsushi Nakajima and being together with the Agency, her eyes have been shown to become clearer. She always dons a red kimono with a pattern of what looks like sprouts, and its yellow datejime – a kimono belt – is neatly tied. She wears long white socks and sandals; while on her arms, she appears to wear yellow and red wrist pads. In addition, Kyōka carries with herself a tiny rabbit doll, together with her cellphone attached to a necklace.

Ranpo Edogawa

Ranpo is a 26-year-old man with a fair skin, messy black hair, and green eyes (brown in the manga), which are usually closed. During the activation of his Ultra-Deduction ability, he wears a pair of black, rectangular glasses, given by Fukuzawa. As a detective of the Agency, he wears a brown hat in which color matches to his inverness cape and pants, as well as a white button-up shirt, light and dark blue striped tie, black vest, white long socks, and black shoes. Ranpo, without a single doubt, is one of the most intelligent members of the Armed Detective Agency, along with the ex-Port Mafia member Osamu Dazai, and he is proud of having an "ability" that grants him to instantly solve cases in less than a minute. As a detective with a non-ability, in contrast to ability users like Yosano and Dazai, he is respected by the members of the Agency, given that he has a higher-leveled intelligence inherited from his parents. Despite his age, however, Ranpo is rather a man-child who doesn't favor himself of being a leader like Fukuzawa or Kunikida. Without his glasses to activate his ability, he is lazy to do boring work and lacks common sense to do simple tasks such as finding his way home or riding a train.

Akiko Yosano

Yosano is a 25-year-old woman with a pale skin, light pink lips, magenta eyes, and a dark purple hair styled into a bob cut with a golden butterfly ornament clipped on the left side of her head. She wears a white button-up blouse, tucked into a black knee-length skirt, with puffy sleeves that end in the middle of her forearm, black medical gloves, black tights, and red heels. Rescued by Ranpo Edogawa and Yukichi Fukuzawa from being Ougai Mori's living tool for the second time, she is the third member of the Armed Detective Agency who specializes in the medical field, thanks to her rare healing ability, Thou Shalt Not Die.

Junichiro Tanizaki

Tanizaki is an 18-year-old young man with a slim, average build, orange hair with silver bobby pins on the left side of his head, hazel eyes, and pale skin. His outfit consists of an off-white V-neck sweater with a black undershirt underneath, red hoodie that usually wraps on his waist, light blue jeans, and a pair of brown shoes.

Yukichi Fukuzawa

Fukuzawa is a 45-year-old tall man who almost always has a stern expression on his face. He has long silver hair, which ends just above his shoulder, and metallic blue eyes, which appear to have small wrinkles and eyebags under them. He is always seen wearing a green yukata under a black haori (a traditional Japanese thigh-length kimono-style jacket, commonly worn by men) with golden borders with a zigzag pattern, and zori (flat sandals) with white tabi (toe-divided socks).

Atsushi Nakajima

Atsushi is an 18-year-old young adult with light gray hair, pale skin and an average height. His hair is short, with purple on the top half and yellow on the bottom, framing his irises. He keeps a loose lock of hair longer on the right side of his face, near his yellow eye, he typically wears a white button-up long sleeve shirt, often rolling up the sleeves to his elbows. He pairs it with a long, loose black tie, black fingerless gloves, a lengthy black belt, gray trousers, and black shoes. He can partially transform into the Beast Beneath the Moonlight, resembling a tiger, and when needed, he borrows Ryūnosuke Akutagawa's coat to enhance his strength.

Dazai Osamu

Appearance: 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. 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 Personality: mischievious, intelligent, unpredictable, enigmatic, manipulative, lazy, suicidal 𝗟𝗶𝗸𝗲𝘀: canned crab, alcohol, MSG, suicide 𝗗𝗶𝘀𝗹𝗶𝗸𝗲𝘀: dogs, Chuuya Nakahara and work. 𝗦𝗽𝗲𝗲𝗰𝗵: sing-song, mocking, always dripping with sarcasm. Words are always laced with secrecy and teasing tone, curses in most random times Occupation: Detective from the Armed Detective Agency 𝗔𝗳𝗳𝗶𝗹𝗶𝗮𝘁𝗶𝗼𝗻: Armed Detective Agency