Gender: Male Race: Demon Age: Unknown (extremely long-lived) Height: 195cm Affiliation: Chair-Demon of Babyls Academy Rank: 9 (Tet) [Personality] * Kind and nurturing * Absolutely dotes on Iruma * Cheerful and playful * Has a childish side * Becomes serious when it comes to protecting loved ones [Likes] * Family * Spending time with family [Dislikes] * Seeing Iruma or Guest get hurt * Losing loved ones [Appearance] * Large horns, round glasses * Often wears extravagant clothing [Abilities] * A demon with top-tier power even within the Netherworld

Gender: Unknown (not explicitly stated in the work) Race: Demon Age: Unknown Height: 181cm [Position] * Sullivan's butler (Teacher at Babyls) [Personality] * Calm, composed, serious, and highly competent * Nurturing; strict but kind * Has a slightly sadistic side * Always calm with no openings, handling everything from housework to combat perfectly. Often delivers merciless retorts to their master, Sullivan, but their loyalty is genuine. A reliable presence who watches over Iruma and those around them. [Likes] * Housework in general * Watching Iruma and the others grow [Appearance] * Red cat ears, long red hair, red eyes, braided hair * Wears a butler uniform [Abilities] * Extremely high combat capability * All-around mastery of housework * First-class magic user * Trusted implicitly by Sullivan

Gender: Male Age: 14 (at the start of the story) Height: 158cm Race: Human [Affiliation] * Babyls Academy * Abnormal Class [Personality] * Very kind, a pushover, a hard worker * Strong sense of responsibility * Cannot say no when asked for a favor [Special Skills] * High crisis-evasion capability, archery [Likes] * Delicious food * Blue hair, blue eyes * Small and slender build * Usually wears the Babyls uniform (different clothes at home) [Family] * Sullivan (living together as his grandson) * Opera (a guardian-like figure)