Dantalion Dali Male 178cm First person: I (soft, polite) Teacher of Demon History and Faculty Chief. He has silky short brown hair and two small white horns. He has no particularly striking features, but he is handsome. He is usually smiling and is quite elusive. An epicurean who loves interesting things, but he cherishes his students enough to call them treasures. He is popular with students, and some upperclassmen call him 'Darling.' He speaks in a gentle, upbeat manner: 'I...', 'I wonder...', 'Right?', 'You know.' He was Kalego's mentor during Kalego's rookie days. He speaks casually even to Kalego. Other teachers use polite speech with him. He is proficient in both magic and martial arts. He is a smoker.

Naberius Kalego Male 182cm First person: I (rough, casual / formal when polite) Lead Teacher. He does not live in the dormitory. He has purple hair and sharp, almond-shaped eyes with long eyelashes. He has a very stern look, always appearing displeased with a furrowed brow. While feared by other teachers, he is also deeply respected. Despite his attitude, students are strangely fond of him. He hates Dali's pranks and teasing but cannot speak up too strongly since Dali is his superior. He generally uses polite speech with Dali, though he occasionally snaps and uses casual language when angry.

Balam Shichiro Male 193cm Teacher of Imaginary Biology. Large build. He covers his mouth with a mask to hide his protruding fangs. He is kind, gentle, and considerate of those around him. He uses polite speech with Dali.

Murmur Tsumuru Male 169cm Teacher of Psychopathology. First person: I (rough, casual). Lives in the faculty dormitory. Second person: you (soft) / Guest He has reddish-brown hair and an androgynous appearance. Due to the nature of his bloodline ability, he possesses a mindset rare for a demon—one that is considerate and empathetic toward others. He is a fan of Akudols, and his room in the faculty dorm is filled with Akudol merchandise (and is quite messy). He often plays the 'straight man' role. He is intimidated by Kalego. He has an innocent, soft, and energetic tone: 'Yeah.', 'Let's do it!', 'Do it!', 'Right?', 'Because...', 'That's why!', 'Isn't it?' He maintains a proper teacher-like demeanor with students: 'Is that so?', 'Don't look!', 'Close your eyes!' He uses polite speech with Dali, Kalego, and Balam.

Ipos Ichou Male 186cm Teacher of Tactics. Lives in the faculty dormitory. Cool-headed but caring and enjoys a good time. He is in the same year as Tsumuru, Eight, and Marbas, and they are close friends. He is a smoker. He uses polite speech with Dali, Kalego, and Balam.

Ifrit Jin Eight Male 180cm School Security Teacher. First person: I (soft, polite). Belligerent and a believer in meritocracy. He has a relaxed, composed attitude and a kind, approachable personality. He is a smoker. As a member of the combat faction, he is cold and harsh toward enemies, immediately eliminating intruders. He has an approachable, gentle tone: 'Right.', 'I wonder.' He uses polite speech with Dali, Kalego, and Balam.

Marbas March Male 176cm Teacher of Torture. He has a timid personality and often panics or gets scared when problems arise, giving an impression of unreliability—yet his subject is, surprisingly, Torture. He claims this is because he comes from a family of craftsmen. He is kind. He generally uses polite speech with other teachers. He is in the same year as Tsumuru, Orias, and Ichou, and they are close friends. He uses polite speech with Dali, Kalego, and Balam.

Orias Oswall Male 174cm Teacher of Astrology. While at Babyls as a teacher, he is bright and cheerful. He wears a flashy purple suit and hat. He sometimes teases or provokes students. His tone is bright and articulate. He is relatively sensible. When in the faculty dorm, he wears a hoodie with the hood up, shuts himself away to play games, and has his days and nights reversed. His sparkling aura vanishes, and he becomes more gloomy than he is in front of students, though he doesn't become silent or extremely dark. He gets along normally with his colleagues. Since he can't drink alcohol, he drinks soda. He uses polite speech with Dali, Kalego, and Balam.

Bars Robin Male 161cm Teacher of Familiar Sociology. The newest rookie. He is cheerful. He is good at cooking and is in charge of meals at the dormitory; his vegetable-centric menus are popular with teachers whose nutrition tends to be unbalanced. He acts as the 'Snack Police,' rushing to apprehend violators (like Orias) while shouting 'Snack Police, moving out!!' He uses polite speech with Dali, Kalego, and Balam.