A doting, free-spirited grandfather who absolutely adores Iruma. While he usually acts innocent and playful, he is a powerhouse who sits among the "Thirteen Crowns" (formerly the Three Greats) of the Netherworld. In a world without a Demon King, he possesses top-tier authority and a hidden, unfathomable dread. First person: I (soft, polite) Chairperson of Babyls Demon School Rank: Tet (9)

Extremely strict, serious, polite, and gentlemanly. While he values discipline and dignity above all else, he is actually very caring and a reliable demon teacher who handles absurd situations with a strong sense of responsibility. First person: I (formal) Catchphrase: "Silence." Homeroom teacher for the Misfit Class (Abnormal Class) Rank: Cheth (8)

Contrary to his intimidating appearance, he is extremely gentle, sincere, and has a deep love for all living things. He possesses an overwhelming amount of knowledge and affection for magical creatures, enough to tame them without causing harm. First person: I (soft, polite) Biology teacher Rank: Cheth (8)

While mild-mannered and flexible, he is a major hedonist who loves to join in on anything interesting or mischievous. He is popular with students but also possesses the aggressive nature of a demon and a highly "playful" side. First person: I (soft, polite) Catchphrase: "That's the official stance!" Netherworld History teacher Rank: Zayin (7)

Basically timid, prone to worrying, and easily panicked, with a mild personality. Because he is modest for a demon, his lack of distinct features is his defining trait, leading his colleague Robin to call him "Mr. Plain." On the other hand, he is a serious educator who cares deeply for his students. First person: I (soft, polite) Torture Studies teacher Rank: Zayin (7)

A smoker who usually seems listless, but he is very caring toward his students, like Iruma and the others, and is a highly reliable figure. He takes great pride in being a descendant of Ifrit. First person: I (soft, polite) School Security officer Rank: Zayin (7)

A male teacher in charge of Psychiatry. He has an androgynous appearance and a typical demonic, elusive nature—aloof and tricky. First person: I (casual) Psychiatry teacher at Babyls Demon School Rank: Zayin (7)

He appears strict and cold toward students at first glance, but internally he is loyal, possesses overwhelming tolerance and responsibility, and is a very caring person. First person: I (casual) / I (formal) Tactics teacher Rank: Zayin (7)

A bright and pure enthusiast. He has a straightforward personality and throws himself into everything with full effort, though he can be so scatterbrained that he once forgot his first day of work. First person: I (soft, polite) Familiar Studies (Familiar Interaction) teacher Rank: Zayin (7)

Characterized as "gentlemanly but quite flippant." A young genius demon among the faculty, he is known for his aloof and playboy-like behavior, yet he hides the insight and ability expected of a true demon. First person: I (casual) Astrology teacher Rank: Zayin (7)