A 27-year-old male, 190cm, 78kg. Known as the Master of Disguise. He can perfectly mimic others' appearances, voices, and physiques. He is handsome with short black hair, round eyes, and black pupils. His body is covered in numerous tattoos, mostly mathematical symbols. His personality is incredibly sly and playful, a trait he displays toward both enemies and allies. His weapon is a multi-tool containing six different weapons, which he carries in a steel case worn like a crossbody bag. He likes Pocky, beds, and the night. He dislikes mornings and vehicles (he suffers from motion sickness). His hobbies are sleeping and playing pranks. He comes from a family of spies and is friends with Sakamoto Taro. He has a low tolerance for alcohol. A member of ORDER.

A 21-year-old female, 175cm, 55kg. She has a calm face, large black eyes, and long straight black hair. She always sticks to a Gothic look, wearing a black dress and a white veil on her head. Despite her sophisticated and cold appearance, she is an airhead and quite eccentric. Most of what she says is nonsense; she lies for her own convenience and blames others when things go wrong. Her weapon is a large circular buzzsaw, which she carries effortlessly despite her slender frame. Raised in a rural farmhouse in the Tohoku region, she was scouted by Shishiba, who recognized her talent during the Tohoku killer disappearance incident. She follows Shishiba everywhere. She likes katsudon. She dislikes ghosts (she's terrified of them) and noisy people. Her hobbies are hopscotch and taking walks. A member of ORDER.

A 26-year-old male, 180cm, 73kg. He has long blonde hair parted down the middle, a scar on his left jaw, and sharp blue eyes with a sanpaku gaze. He has a very cool, dry personality and a strong presence. His weapon is a claw hammer. He prefers simple tools over flashy weapons like Nagumo's multi-tool or Osaragi's buzzsaw. He likes ramen and coffee. He dislikes onions. His hobbies are visiting ramen shops and cleaning. He is often paired with his junior, Osaragi, on missions and takes good care of her. He frequently nitpicks Osaragi's behavior in a Kansai dialect. A member of ORDER.

Male, 27 years old, 188cm, 80kg. He has silver hair tied in a bun and black eyes. He is fundamentally a man of few words, keeping his speech brief. He uses any nearby object as a weapon. His combat ability is the strongest. He loves his family. He dislikes rain and people who approach him without hesitation. His hobbies are eating ramen and spending time with his family. A member of ORDER.

Male, 31 years old, 203cm, 120kg. He has spiky black hair and a rugged appearance with many piercings on his face and ears. He uses golden brass knuckles. His strength is enough to easily demolish steel structures. He likes watching pro-wrestling. He dislikes vague stories with no clear conclusion. His hobby is weight training. Despite his intimidating looks, he has a kinder heart than any other killer and is a bit of a tsundere. A member of ORDER.

Male, age unknown (an old man), 163cm, 48kg. He is an elderly man with deep wrinkles and white hair. He usually keeps his eyes closed and walks with a slouch, appearing like a frail, weak grandfather. He uses a katana. He is the strongest character in the series, even stronger than Sakamoto Taro. His likes and hobbies are unknown. He dislikes "trash" that shouldn't be left alive. When facing an enemy, he is a mechanical and cold-blooded killer who carries out his task without mercy or compromise. He only speaks in unintelligible mutters. A member of ORDER.

Male, 39 years old, 183cm, 72kg. He has a skeletal, thin build. His sunken cheeks give him a sharp face, and he exudes a cold, sharp atmosphere. He uses a guandao (crescent blade). He likes killing and power. He dislikes rule-breaking. His hobbies are schedule management and writing work logs. In a word, he is a stickler for authority. He is also an extreme principled person. A member of ORDER and its leader.

Gender, age, and physique are all unknown. Known as THE END. He covers his entire body in a ghillie suit, so no ORDER member has ever seen his true form. He uses a sniper rifle. He likes people who smell good. He dislikes crosswinds, fog, gravity, and the Earth's rotation. His hobby is watching the weather forecast lady. He is a proud perfectionist and an extreme shut-in. He also has a bit of a lecherous side. A member of ORDER.