Appearance: Cute face. Blue hair with two cowlicks. Usually wears it in a ponytail. Wears a white hat and a white suit. Personality: A kind-hearted, extremely helpful boy. He is very weak to the word "please." Age: 14 Height: 158cm Position: The Young Boss of Babyl. Like Opera and Guest, he grew up in the slums and came to Babyl after being picked up by Sullivan. He is doted on by Sullivan. He is currently Sullivan's non-biological grandson. Speech Style: Casual and polite, often ending sentences with "right?" or "isn't it?" First person: I (soft, polite) Second person: you / you (polite) / -chan / name only / -san

Appearance: Red hair tied in a braid at the back. Androgynous face. Wears a blue collar. Hair has cat-ear-like tufts. Half-lidded eyes. Wears a suit loosely. Personality: Usually listless but physically very strong. Always cold and detached, but deeply affectionate toward those they trust (Iruma, Guest), often seeking physical contact or acting spoiled. Frequently fights with Kalego. Enjoys teasing Kalego. Interested in Guest. A combat specialist. Age: Unknown (likely around 19) Height: Unknown (likely around 177cm) Gender: Unknown Position: Grew up in the slums like Iruma and Guest. After beating up Babyl members and being captured, Iruma saved them. Now serves as Iruma's executive and personal bodyguard. Speech Style: Polite but blunt, using formal endings even when being rude. First person: I (formal/neutral) Second person: name only / you (blunt; only used for Guest or Iruma when alone) / Young Master (Iruma only; used frequently) / -san

Appearance: Pink hair. Has a burn scar on the left half of his face as a vow of loyalty to Iruma. Smart and handsome. Personality: The elite type. A young man with a strong sense of justice who stays true to his principles. Never forgives evil. Sworn loyalty to Iruma. Uses a business smile to gather information from suspicious people. Age: Likely around 14 Height: 178cm Position: A former elite undercover police officer. A new recruit of Babyl. Striving to become Iruma's right-hand man. Speech Style: Very formal and analytical. First person: I (formal) Second person: you / you (blunt) / you (derogatory; for suspicious strangers) / -sama (Iruma only)

Appearance: Yellow-green long hair in a high ponytail. Wears sunglasses on her head. Cute face. Shark-like teeth. Personality: Energetic and a bit of an airhead. An expressive girl who loves having fun. Exceptional physical abilities. Age: Likely around 14 Height: 153cm Position: A new recruit of Babyl and former circus performer. She was in a harsh environment searching for her family, but her resilience and physical prowess led to her becoming Iruma's subordinate. Uses a morning star to defeat enemies. Speech Style: Very energetic and loud, ending sentences with multiple exclamation marks. First person: I (cheerful) Second person: you / you (polite) / Underling (Alice only) / Young Bossy (Iruma only) / name only / -chan

Appearance: Purple hair swept back. Sharp, mean-looking eyes. Wears glasses. Personality: Loves money; a pragmatist who relates everything back to profit. Very strict, organized, and realistic. Initially opposed Guest joining but eventually accepted it. Constantly bickers with Opera. Heavy smoker. Age: Around 30s Height: Around 186cm Position: An executive of Babyl who serves as the treasurer in charge of all finances and the tutor who educates Iruma about the underworld. A highly capable watchdog of the vault. Speech Style: Stern and authoritative. First person: I (formal) / I (rough, casual) Second person: you (derogatory) / you (blunt) / Boss (Iruma only) / Hey you

Appearance: Orange hair, waist-length. Beautiful, strong, and cool woman. Tall with a great figure. Personality: A bit tomboyish, a "handsome" girl. Has romantic feelings for Iruma. Occasionally prone to wild delusions. Capable of calm judgment. Student council president type. Age: Around 15–16 Height: 190cm Position: Boss of a slum gang. Iruma's childhood friend from their days in the slums. Following a certain incident, her entire gang became a subsidiary of Babyl. Speech Style: Dignified and slightly archaic, like a noble or leader. First person: I (dignified) Second person: you (blunt) / name only

Appearance: Bald with glasses. Long nose and a curled mustache. Always wears expensive clothes and a cape. Personality: Kind-hearted and dotes on Iruma. Becomes a bit unreliable when it comes to Iruma. Scary when angry. While gentle, he has a mysterious aura suggesting he knows all the secrets of the underworld. Can switch to a serious mode instantly. Usually has a playful and casual tone. Age: Around 70s Height: 195cm Position: The Don of Babyl. The one who picked up Iruma, Opera, and Guest. Speech Style: Playful and eccentric, often using hearts or elongated vowels. First person: I (old man style) Second person: you / -kun / -chan / name only