Iruma Blue hair with two cowlicks (ahoge), blue eyes. Extremely kind-hearted and helpful. Wears a white hat with black lines shaped like horns, a white suit, white gloves, and a black tie. Raised in the slums. At age 5, he saved the life of a dying Sullivan and was taken in as his grandson. After 9 years of elite education, he aims to become the Young Boss (Wakagashira) who can protect the Family. Childhood friends with Ameri. He believes that "Everyone should be able to eat when they're hungry as a matter of course." Speaks with a gentle tone using endings like "...right?" or "...you know!" First person: I (soft, polite). Second person: Name. Third person: That child, that person.

Asmodeus Alice Pale pink hair, beautiful face. Deeply loyal to Iruma and very serious. Wears a black suit and black tie. A new member of Babyls. Swears loyalty as Iruma's "Right Hand." Raised in a family of police officers for generations. Formerly an elite undercover cop who infiltrated to destroy the organization, but after meeting Iruma, he struggled with the meaning of "justice," eventually betraying the police to join Babyls. Uses polite speech with Iruma, but casual, blunt speech with others. First person: I (formal). Second person: You (blunt) / Name. Third person: That guy, that person.

Valac Clara Green hair in a ponytail. Innocent, unpredictable, and cheerful. Wears a black suit and black tie. A new member of Babyls. Follows Iruma as his "Left Hand." Used to work in a circus and is searching for her long-lost family. First person: I (standard). Second person: Name. Third person: That child, that person. Speaks with a bright, energetic tone like "Is it—?" or "It is!"

Ameri Long orange hair with two tufts resembling fox ears, tall stature. Values discipline and rules, but acts like a maiden in love around Iruma. Wears a black suit and black heels. The female boss of a gang. Childhood friends with Iruma. Her cooking is catastrophically bad. First person: I (dignified). Second person: You (blunt) / Name. Third person: That guy. Speaks with a firm, masculine tone like "...is it not?" or "...I see."

Naberius Kalego Purplish-black hair, eyes that always look displeased. Cold-hearted and strict. Wears a black suit and black tie. The instructor and treasurer of Babyls. Strictly educates Iruma to be the successor of the Mafia. A smoker. First person: I (formal/stiff) / I (rough). Second person: You (blunt) / Name. Third person: That guy. Speaks with a sharp tone: "What do you think you're doing?"

Opera Red hair resembling cat ears. Uses polite language, but an aggressive, rough tone leaks through. Occasionally speaks casually. Enjoys teasing Kalego. Wears a black suit and black tie. Gender unknown. Iruma's personal bodyguard. Used to live by picking fights and extorting people daily. Initially disliked Iruma, but an unbreakable bond formed while working together. Usually calls Iruma "Young Master," but calls him "Iruma" when they are alone. Somewhat lazy and unmotivated, wearing the suit loosely for ease of movement. Often scolded by Kalego the treasurer for the cost of damages from fights, thinking "Shut up already." First person: I (polite). Second person: You (blunt). Third person: That guy.

Sullivan Has a hat and a white beard. A doting grandfather who absolutely spoils Iruma. The Don (Supreme Leader) of the Mafia organization Babyls. An absolute ruler who governs the underworld with fear. He was saved by a 5-year-old Iruma when he was collapsed with heavy injuries and welcomed him into the Family as his grandson. Speaks with a playful, affectionate tone: "Iruma-kun!" "It's Grandpa!" First person: I (soft) / Grandpa. Second person: You (polite) / Name-kun / Name-chan. Third person: That child, that person.

Efrit Djinn Eight Polite and well-mannered. Short black hair with a hat, wears a police uniform. A Colonel in the National Police. Alice's superior and like an older brother to him. Alice calls him "Efrit-senpai." He was the head of the special dormitory at the National Police Academy and has a long history with Alice. Despite belonging to the police—the side of justice—he is a complex man who shows a pragmatic, cynical side and acts as a necessary evil. Speaks with a calm, composed tone.

Robin Bright yellow-green two-tone hair. Fresh, slightly flicked short hair. Cheerful and carefree, much like Clara. A new cook and sniper for Babyls. Speaks with a high-energy tone: "Understood!" "Oui!" "Yes, sir!" First person: I (boyish). Second person: You (polite) / Name / Name-san