Gender: Male Age: 15 Race: Human (The only human in the Netherworld; no one knows except for a few demons) Rank: 5 (He) Features: A kind soul who can never refuse when told "Please." A student in the Misfit Class at Babyls. He was adopted by Sullivan as his grandson. He wants to attend school peacefully, but he always ends up being the center of attention at Babyls...

Gender: Male Race: Demon Rank: 8 (Cheth) Features: The homeroom teacher of the Misfit Class at Babyls. He loves words like solemnity and silence, and is strict and merciless. He has been close friends with Shichiro since their days as students at Babyls and maintains that friendship to this day. He seems like a cold and gloomy teacher, but he is sincere about his students' growth, to the point of writing a feedback notebook for every single student he teaches. He does not live in the faculty dormitory.

Gender: Male Race: Demon Rank: 7 (Zayin) Bloodline Ability: One Hit Bullseye—The ability to create a bow once a day and fire an arrow that never misses. Features: A new teacher at Babyls. He is diligent and has strong focus, but conversely, he sometimes misses important details. He stays in the faculty dormitory and sometimes cooks nutritious dinners for the other teachers (he even scolds teachers who eat snacks before dinner time). He has a cheerful and pure personality. He is the type to approach others without hesitation.

Gender: Male Race: Demon Rank: 7 (Zayin) Features: The head of the faculty and history teacher at Babyls. He is Kalego's senior. His apparent age is around 35. He has a calm and always relaxed personality, and he uses polite speech with his fellow teachers.

Gender: Male Race: Demon Rank: 7 (Zayin) Bloodline Ability: Lucky Happy (Astrology)—Not only does good luck follow him, but he can also bring luck to those around him. Features: The astrology teacher at Babyls. A gentleman with a lighthearted personality, he enjoys entertainment like gambling but does not drink alcohol. He rarely shows up to drinking parties or staff dinners. On his days off, he turns off his ability and shows a slightly gloomy side.

Gender: Male Race: Demon Rank: 9 (Teth) Features: The Chair-Demon of Babyls. Iruma's adoptive grandfather. With the Demon King gone, he is a powerful figure at the pinnacle of the Netherworld. He dotes on Iruma immensely. Usually, he acts like a friendly and affectionate grandfather.

Gender: Male Race: Demon Rank: 7 (Zayin) Features: The teacher of Torture History at Babyls. Despite his plain and gentle face, he is a terrifying demon who tortures students under the guise of exams. He is calm and quiet, and is close friends with Robin and Oswal.

Gender: Male Race: Demon Rank: 8 (Cheth) Bloodline Ability: Buzzer (Falsehood Bell)—He can instantly detect an opponent's lies and cheating. Features: The teacher of Imaginary Biology at Babyls. He is one of the few people who knows Iruma is human. He wears a visor over his mouth, beneath which his left cheek is torn, exposing his upper molars. Contrary to his scary appearance, he is quite kind and well-mannered.

Gender: Female Race: Demon Rank: 7 (Zayin) Bloodline Ability: All-Rounder (Master of Skills)—She can master any kind of magic (the power is proportional to the amount of mana). Features: The teacher of Basic Magic at Babyls. She secretly harbors feelings for Kalego. She wears her long white hair in a ponytail. She always thinks of her students and strives to fulfill her duties as a teacher. She has a clean and polite way of speaking. She is sensible and always considerate of others.

Gender: Male Race: Demon Rank: 7 (Zayin) Features: The security teacher at Babyls. He is an expert in fire magic. He is often seen with a cigarette in his mouth. Even his tail is wreathed in flames. It is said that Ifrit's flames are the best in the Netherworld, and those flames make both cigarettes and food taste better.