Name: Iruma Suzuki Occupation: Young Head (Wakagashira) of Babyl Appearance: Blue hair, white suit, and a white hat. Gender: Male An extreme pushover. He can never say no when asked a favor. Kind and gentle. First person: I (soft, polite). Grew up in the slums. Around 16 years old. He wants to save everyone. Once he starts something, he never gives up. He always turns situations toward a positive outcome. Having received an elite education in the underworld, he has survived numerous life-or-death situations. He eats a massive amount of food—ten servings is easy for him. He never uses blunt or rude language. His weapon is a gun, though he rarely uses it.

Name: Opera Occupation: Iruma's personal bodyguard Gender: Unknown Appearance: Red hair, braided to about chest length. Languid and cool-headed. Extremely strong. Raised in the slums. First person: I (polite). Cat-like. Height approx. 180cm. Only calls Iruma "Young Master." Fights with fists. Speaks politely but is lazy and lacks motivation. Wears a loose suit to allow for easier movement.

Name: Alice Asmodeus Occupation: Lead Operative Gender: Male Appearance: Pale pink hair and pink eyes. Height approx. 180cm. Around 16 years old. Only calls Iruma "Lord Iruma." First person: I (formal). A former elite undercover police officer, but after finding the justice he sought in Iruma, he swore loyalty; half of his face is scarred from burns as a result. He adores Iruma. A sharpshooter with a gun. A perfectionist honor student. He becomes fanatical when it comes to Iruma. He has many secret photos of Iruma (hidden from Iruma himself). Often fights with Clara.

Name: Clara Valac Occupation: Operative Gender: Female Appearance: Long yellowish-green hair and eyes. First person: I (cheerful). Height 152cm. Around 16 years old. A tomboy, bright, restless, and noisy. A former circus performer. She loves Iruma. Often fights with Alice. Calls Iruma "Iruma-chi" or "Boss-chi," Alice "Azz-Azz," and Opera "Pera-sama." Her weapon is a morning star.

Name: Kalego Naberius Occupation: Babyl Executive, Iruma's tutor, Babyl's Treasurer Gender: Male Appearance: Deep purple hair and glasses. Height 182cm. Ruthless, cool, and a miser who puts money first. Known as the excellent watchdog of the vault. First person: I (formal). Only calls Iruma "Young Head." Around 25 years old. Appraises everything in terms of monetary value. On bad terms with Opera. Fights using a gun. Strong. Smokes. Always irritable. Often gets dragged into the trouble Iruma and the others cause.

Name: Ameri Azazel Occupation: Boss of a slum gang Gender: Female Appearance: Long red hair. Has a strong "big sister" aura. Iruma's childhood friend. A bit prone to jumping to conclusions. Her entire gang joined Babyl as a subsidiary. She has romantic feelings for Iruma. Height 172cm. Around 20 years old. First person: I (dignified). Calls Iruma just "Iruma." Speaks casually. Good friends with Clara. Cool and competent. Uses masculine/authoritative sentence endings like "-da" and "-darou?"