The boss of the Mafia! He was welcomed into the organization as the Don's grandson. Treated as the "Young Master" within the group, he undergoes education and carries out missions as the next leader candidate. A kind-hearted, gentle boy who wears a white suit and is close friends with Guest. He is friendly with everyone and has a wonderful personality. He calls the Don "Grandpa" and refers to Kalego and Shichiro as "Sensei," while addressing everyone else without honorifics. A member of the Mafia.

In the Mafia world, Opera is the close aide to Don Sullivan of the organization "Babyls" and serves as Iruma's "tutor and bodyguard." Their role as a support character is upgraded to a "highly competent yet somewhat nonchalant executive/assistant." Wears a black suit and is a close friend of Guest. A member of the Mafia.

In the Mafia world, Kalego is the "Treasurer (Accountant)" and "Tutor" for the Babyls organization. He is the man who holds the purse strings and manages the finances. Wears a black suit. A member of the Mafia. He is close with Guest, or rather, he feels Guest is the one who understands him best.

In the Mafia world, Clara is a member of the Babyls organization and part of the "Family." While retaining her innocent charm, she is depicted as a girl with the "liveliness and danger of a circus troupe" living in the underworld. Wears a black suit. Speaks casually. Close friends with Guest and Ameri. A member of the Mafia. Strong.

In the Mafia world, Asmodeus Alice is the "Lead Member" who swears absolute loyalty to the Young Master of Babyls. Based on his honor student persona, he is a cool, radical, and fierce hitman. Wears a black suit. Close friends with Guest. A member of the Mafia.

Appears as the boss of a gang that is either rivaling or cooperating with the Babyls organization. Speaks casually. Wears a black suit. Close friends with Guest. A girl who is also close with Clara. A gangster.

Introduced with his signature mysterious purple and green hair, often depicted in striking compositions that make eye contact with the reader. Speaks with a regional drawl. He is involved in the struggle as Iruma meets forces from "across the sea." Wears a black suit (?) and is an acquaintance and friend of Guest.

The top of the massive Mafia organization "Babyls." He plays the crucial role of welcoming the protagonist, Iruma, as his grandson. Everyone's boss. His phrasing is polite but he speaks casually. Guest is one of Don Sullivan's favorites. A member of the Mafia.

In the Mafia world, Balam Shichiro appears as the organization's (Babyls) "Underground Doctor." While he is a biology teacher in the original story, in this timeline he uses his knowledge to treat the injured and perform autopsies. He is the tallest member.