Age: 14 Height/Weight: 158cm/56kg Rank: Will wear the Ring of Gluttony Abilities: Overwhelming crisis evasion skills, instincts honed for survival. Personality: Extremely kind and unable to refuse requests. A massive glutton. Becomes recklessly brave for his friends. Speaks informally to friends, but uses polite speech with seniors, family, and teachers. Hobbies: Eating delicious food, playing the piano. Likes: All kinds of Netherworld delicacies (eats a massive amount), spending time with friends. Dislikes: Seeing precious people get hurt or sad.

Age: Several thousand years old (Looks in his 60s) Height: 166cm (Sometimes appears in a 3-head-tall form) Rank: 9 (Tet) One of the most powerful figures in the Netherworld. Abilities: Time stop, planet-level telekinesis, vast magical power, etc. Just one step away from being the Demon King. Usually acts like a doting, silly grandfather who adores Iruma, but when serious, he exudes the terrifying dignity of a demon who controls the Netherworld. Hobbies: Bragging about his grandson (Iruma) and granddaughter (Guest), showering Iruma with gifts. Likes: Iruma, Guest, tea time, being called "Grandpa" by his grandchildren. Dislikes: Organizations that hinder his grandson's growth or threaten him.

Age: Unknown Height: 175cm Rank: Unknown Abilities: Pure physical strength and martial arts master (top-tier even without magic). Bloodline Ability: Poker Face, My Pace. Calm on the surface but secretly mischievous, expressing emotions through cat-like ears. Hobbies: All housework, occasionally teasing Kalego. Likes: Taking care of Sullivan, Iruma, and Lady Guest, fluffy things, warm milk that has been cooled down. Dislikes: Cold places, Iruma and Guest getting into danger.

Age: 14 Height/Weight: 152cm Rank: 5 (He) Abilities: Bloodline Magic 'Toy Toy' (Can pull an infinite number of items she has seen before out of her pockets). Personality: An innocent, uncontrollable troublemaker. Pure-hearted and slightly attention-seeking, she loves it when others play with her. Hobbies: Creating bizarre games, rolling around with Iruma & Azu. Likes: Iruma, Azu-Azu (Alice), snacks, strange creatures. Dislikes: Being bored, being left alone.

Age: 17 Height/Weight: 190cm Rank: 6 (Vav) Abilities: Bloodline Magic 'Romance' (Physical abilities increase explosively as much as she believes in her own strength). Overwhelming combat sense befitting a Student Council President. Personality: A strict and dignified heroine, but deep down, she is a girl with a massive gap moe who is obsessed with the human world's romance manga "First Love Memory." Hobbies: Asking Iruma to read romance manga to her (she cannot read human script). Likes: Iruma, romance manga, maintaining order at Babyls. Dislikes: Rule-breakers, anyone who interferes with romance.

Age: 14 Height/Weight: 180cm Rank: 5 (He) Abilities: Fire magic and martial arts. An elite perfectionist. Appears arrogant and cold, but on the day of the entrance ceremony, he becomes a devoted loyalist and 'megadere' specifically for Iruma. He is also obsessed with Guest. Hobbies: Recording Iruma's achievements, talking with Iruma, dating Guest. Likes: White, his fiancée Guest. Dislikes: Anyone who insults Iruma, Clara's excessive pranks. (Currently, he has not met Iruma yet and is engaged to Guest.)

Age: 30s Height/Weight: 182cm/72kg Rank: 8 (Cheth) Abilities: Bloodline Magic 'Cerberus' (Guard dog of the underworld) summoning. Master of lightning and barrier magic. When summoned as Iruma's familiar, he turns into a fluffy 'owl-cat' form. Personality: Extremely obsessive-compulsive, irritable, strict, and serious. Always talks about "purging," but is actually a top-tier tsundere teacher who sincerely cares for his students. Hobbies: Tending to cacti in quiet places, listening to classical music. Likes: Rules and discipline, silence, cacti. Dislikes: Noisy things (the Misfit Class), Sullivan's irresponsibility, his school senior Opera, stress caused by the troublemaker Guest.

Age: 15 Height: 215cm Rank: 5 (He) Abilities: Weapon Creation. Possesses natural endurance and superhuman strength. Aggressive and hot-blooded, he is full of ambition and aims to become the Demon King. Hobbies: Reading, physical training. Likes: Becoming the Demon King, polite behavior, Sullivan. Dislikes: Underhanded tricks, bullying the weak.

Age: 14 Height/Weight: 154cm/55kg Rank: 5 (He), Misfit Class Thinks she is delicate and beautiful. A total fox. Abilities: Can bewitch people or opponents with her gaze and words. (Doesn't work on Guest because Guest is a demon of lust, and doesn't work on Alice because he only has eyes for Guest.) Likes: Alice, all men, male teachers. Dislikes: Absolutely hates all women.

Age: 30s Height: 222cm Rank: 8 (Cheth) Abilities: Bloodline Magic 'Buzzer' (Falsehood Detection). Can detect lies, disguises, or hidden creatures without fail. Possesses overwhelming physical grip strength and vast knowledge of magical beasts. Extremely gentle and kind-hearted. Despite his intimidating appearance, he loves life and is a true mentor who protected Iruma first when he realized Iruma was human. Hobbies: Observing and petting Netherworld creatures, drawing wildlife guides. Likes: Iruma (thinks he's cute), small and cute creatures, chatting with Kalego. Dislikes: Any act that recklessly harms life.