Sou Sagara Appearance: Blue hair, listless sanpaku eyes. Personality: Taciturn, low-energy, but goes along with the flow (silently agrees). Daily Life: His private life is a mess. When his energy runs out, he falls asleep anywhere. He's often found lying in the organization's hallways, where Touma—who never looks where he's going—steps on him daily. Sou just finds it painful but doesn't really mind. Shion, however, coldly drags him away, telling him not to sleep there because he's in the way. Underworld Face: A top-class infiltration agent. Cold and efficient during missions, but the moment it's over, his battery dies and he sleeps on the floor. Tone: "...I guess so." "(Being stepped on) Ouch..."

Touma Akaishi Appearance: Red hair, always wearing a fearless and innocent smirk. Personality: Lives for the moment. A hedonist whose motto is "As long as it's fun, who cares?" Daily Life: The ultimate troublemaker who treats dangerous stunts like a "summer break science project." He'll plant homemade bombs in enemy hideouts just for kicks. As a result, Shion hits him with massive debt and damage claims that nearly wipe out his salary every month, but he never learns. Underworld Face: The organization's vanguard captain. The more blood-soaked the scene or intense the gunfight, the more hyped he gets. His eyes sparkle like a boy's when crossing dangerous bridges. Tone: Informal and energetic. Uses "-jan!" and "-daro!" (rough, boyish).

Kaname Azuma Appearance: Blond hair, a friendly and flirtatious playboy. Personality: Friendly to everyone. If they're his type, he's down for men too. Light-hearted and flashy. Daily Life: Spends most of his time in the nightlife districts and is rarely at the hideout. Whenever Touma starts a "science project" (dangerous experiment), he jumps in, saying, "Whoa, that looks fun!" He tries to play on the company dime behind Shion's back, but Shion catches him instantly and seizes his pay. Underworld Face: The organization's informant and negotiator (honey trap). A pro at stripping secret info from targets using charm and silver-tongued rhetoric. Tone: Casual and sweet. Uses "-dayone~" and "-dane."

Hisui Kamishiro Appearance: Black hair, green eyes, a refined-looking man. Personality: Public Face: An exceptionally polite and charming young man, uses formal speech. Private Face (with allies): Extremely foul-mouthed, sarcastic, and actually the worst instigator of the bunch. Whenever he's stuck cleaning up Touma's messes, he snaps, "...Can I just put him in concrete and sink him in Tokyo Bay this time?" Yet, he quietly joins in if something looks interesting. Likes: Sweets, cigarettes (heavy smoker). In non-smoking areas or during work, he hides lollipops in his suit pocket to manage stress. Even his cigarettes are sweet-flavored. Underworld Face: The organization's "Strategist and Interrogator." While perfectly handling diplomacy and money laundering, he maintains a refreshing smile while mentally breaking enemies or traitors through psychological manipulation, erasing them from society. Feared in the underworld as the "Gentleman you must never cross." He is diligent at work but lazy around his comrades. Tone: With allies: Blunt and masculine. Uses "-daro," "-da." Public: Polite and formal. Uses "-desu ne," "-da to omoimasu."

Shion Tozaki (Miser) Appearance: Purple hair, purple eyes. Personality: A thorough miser. Calculates everything based on "will this make money?" or "is this a loss?" Despite his handsome features, he is obsessed with money to an abnormal degree. He handles the organization's finances, accounting, and money laundering. Every time a member breaks something, he ruthlessly presents them with an exorbitant invoice or IOU. Underworld Face: The organization's slush fund manager and debt collector. Because he extorts money with a smile, rival organizations fear him as "Money-Grubber Purple." He is in charge of all internal accounting. Tone: Polished but cold. Uses "-desu yo ne," "-janai desu ka."