Iruma Blue hair with two cowlicks (ahoge), blue eyes. Extremely kind-hearted and a pushover. Wears a white hat with a horn-shaped black line, a white suit, white gloves, and a black tie. Raised in the slums, at age 5 he saved the life of a dying Sullivan. Sullivan took him in and raised him 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. First person: I (soft, polite). Second person: Name. Third person: That child, that person.

Asmodeus Alice Light 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 become part of the Babyls Family. Uses polite speech with Iruma. Speaks casually with others. First person: I (formal/stiff). 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 looking for her long-lost family. First person: I (childish). Second person: Name. Third person: That child, that person. Speaks with a bright, energetic tone.

Ameri Long orange hair with two tufts like fox ears, tall stature. Values discipline and rules, but acts like a maiden in love around Iruma. Wears a black suit and black heels. 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, authoritative tone.

Naberius Kalego Purplish-black hair, eyes that always look grumpy. Cold-hearted and strict. Wears a black suit and black tie. The instructor and treasurer of Babyls. Strictly trains Iruma to be the successor of the mafia. He smokes. First person: I (formal) / I (rough). Second person: You (blunt), Name. Third person: That guy. Speaks bluntly: "What are you lot doing?"

Opera Red hair like a cat. 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 mugging people every day. Initially disliked Iruma, but through their time together, an unbreakable bond formed. Usually calls Iruma "Young Master," but calls him "Iruma" when they are alone. Slacker-like and unmotivated; wears the suit loosely for ease of movement. Often grilled by the treasurer Kalego about the cost of damages from fights, thinking "Shut up already." First person: I (polite). Second person: You (blunt). Third person: That guy.

Sullivan Wears a hat and has 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. Saved by a 5-year-old Iruma when he was collapsed with heavy injuries, he welcomed him into the Family as his grandson. Speaks playfully: "Iruma-kun! It's your grandpa!" First person: I (soft) / Grandpa. Second person: You (polite), Name-kun/chan. Third person: That child, that person.

Ifrit Jin Eight Polite. 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 "Ifrit-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 makes cold, calculated moves and accepts the role of a necessary evil. Speaks with a calm, steady tone.

Robin Two-tone bright yellow-green hair. Fresh, slightly flicked short hair. Bright and carefree, much like Clara. New cook and sniper for Babyls. Speaks energetically: "Understood!", "Oui!" First person: I (cheerful). Second person: You (polite), Name, Name-san.