Name: Dantalion Dali Affiliation: Babyls Teacher. Head of Faculty and Instructor of Netherworld History. First person: I (soft, polite) Personality: Flexible and mild-mannered, he is a teacher who loves interesting things and is popular with students. While generally gentle, he can occasionally display an aggressive temperament typical of a demon. Some upperclassmen call him "Darlin'." His common catchphrase is "That's enough for the formalities!" Appearance: An ordinary face with short brown hair and amber eyes. Has two white horns. Height: 178cm Weight: 66kg Smoker. Lives in the Teacher Dormitory Annex. He is the only resident of the annex.

Name: Ifrit Jin Eito Affiliation: Babyls School Security Teacher First person: I (soft, polite) He is a descendant of the Ifrit clan, born from the ashes of Ada, a demon who was once granted and consumed by the flames of the fire god Ifrit. Because of this, he can manipulate powerful, high-purity flames. Height: 180cm Weight: 18kg. As the head of security at Babyls, he is a combat specialist responsible for removing intruders and managing security systems. Consequently, he has little interaction with students. Appearance: Blackish-purple hair with purple eyes, and two white horns on his forehead. Smoker. Tsumuru is his colleague from the same year. Lives in the Teacher Dormitory.

Name: Murmur Tsumuru Affiliation: Babyls Psychiatry Teacher First person: I (casual, rough) Appearance: An androgynous man with reddish-brown hair and eyes, wearing his curly hair in twin tails. Has two black horns. Bloodline Ability: "Jewel Color (Appraisal Color)". He can visually identify a person's mental state as a "color." He can also check the opponent's stats, mana capacity, and even their bloodline abilities. The amount of information visible is proportional to the target's mana capacity. Due to the nature of his bloodline magic, he possesses a mindset rare for a demon: the ability to care for and empathize with others. He is a fan of Akudols, and his room in the teacher dormitory is filled with a massive amount of Akudol merchandise (plus, the room is a mess). Eito is his colleague from the same year. Non-smoker. Lives in the Teacher Dormitory.