Gender: Male Age: 15 Species: Human (The only human in the Netherworld; no one knows except a few demons) Rank: 5 (He) Traits: A kind soul who can never say no when asked "Please." A student in the Misfit Class at Babyls. Adopted as a grandson by Sullivan. He is humble, polite, and has a strong sense of responsibility. He avoids causing trouble and apologizes immediately if he makes a mistake. He wants to attend school peacefully, but he always ends up being the center of attention at Babyls...

Gender: Male Species: Demon Rank: 8 (Cheth) Apparent Age: 35 Traits: The homeroom teacher of the Misfit Class at Babyls. He values words like solemnity and silence, and is strict and ruthless. He has been close friends with Balam since their student days at Babyls and maintains that friendship to this day. Though he seems like a scary and gloomy teacher, 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 Species: Demon Rank: 7 (Zayin) Apparent Age: 22 Bloodline Ability: One Hit, One Kill - The ability to create a bow and fire an arrow that never misses once per day. Traits: 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 prepares nutritious dinners for the other teachers (and scolds those who eat snacks before dinner time). He has a cheerful and pure personality. He is the type to approach others without hesitation.

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

Gender: Male Species: Demon Rank: 7 (Zayin) Apparent Age: Unknown Bloodline Ability: Lucky Happy (Divination) - Not only does luck follow him, but he can also bring luck to those around him. Traits: 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 at drinking parties or staff dinners. On his days off, he turns off his ability and shows a slightly gloomy side.

Gender: Male Species: Demon Rank: 9 (Teth) Apparent Age: 66 Traits: The Chair of Babyls. Iruma's adoptive grandfather. With the Demon King gone, he is a powerhouse at the pinnacle of the Netherworld. He dotes on Iruma immensely. Usually, he acts like a friendly and sweet grandfather.

Gender: Male Species: Demon Rank: 7 (Zayin) Apparent Age: 28 Traits: The torture history teacher 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 Species: Demon Rank: 8 (Cheth) Apparent Age: 34 Bloodline Ability: Buzzer (Falsehood Bell) - He can instantly detect lies and cheating from others. Traits: The imaginary biology teacher 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. He has been close with Kalego since their school days. Contrary to his scary appearance, he is quite kind and well-mannered.

Gender: Female Species: Demon Rank: 7 (Zayin) Apparent Age: 25 Bloodline Ability: All-Rounder (Master of Skills) - She can master any form of magic (power is proportional to mana capacity). Traits: The basic magic teacher 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 Species: Demon Rank: 7 (Zayin) Apparent Age: 28 Traits: The security teacher at Babyls. An expert in fire magic. He often has a cigarette in his mouth. His tail is also wreathed in flames. Ifrit's flames are said to be the best in the Netherworld, and it's rumored that both cigarettes and food taste better with those flames.