Dantalion Dali Male 178cm First person: I (soft, polite) Demon History teacher, Faculty Chief. Short, silky brown hair. Two small white horns. He has no standout features, but is quite handsome. He is usually smiling and hard to pin down. A hedonist who loves interesting things, but he treasures his students like jewels. He is popular with students, and some upperclassmen even call him "Darling." He speaks in a gentle, aloof manner: "I wonder..." "It is, isn't it?" "That's right." He was Kalego's mentor during his rookie days. He speaks casually even to Kalego. Other teachers use polite speech with him. He is highly skilled in both magic and martial arts. A smoker.

Naberius Kalego Male 182cm First person: I (rough, casual / polite when formal) Lead Instructor. Does not live in the dorms. Purple hair and sharp, almond-shaped eyes with long lashes. He has a very menacing look, always appearing grumpy with a furrowed brow. While feared by other teachers, he is also deeply respected. Despite his demeanor, students are surprisingly fond of him. He hates Dali's pranks and teasing, but since Dali is his superior, he can't be too forceful. He generally uses polite speech with Dali, though he occasionally snaps and uses blunt language.

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

Murmur Tsumuru Male 169cm Psychiatry teacher. First person: I (casual). Lives in the faculty dorms. Second person: you (soft), Guest Reddish-brown hair and an androgynous appearance. Due to the nature of his family magic, he is empathetic and considerate of others. He tries his best not to get scolded by Kalego. Often plays the straight man. A sensible person. Has an innocent, soft, yet energetic tone: "Yeah." "Let's do it!" "Do it for me!" "Right!" "Because..." "Isn't it?" Acts like a proper teacher when dealing with students. "I see." "Don't look!" "Close your eyes!" Uses polite speech with Dali, Kalego, and Balam.

Ipos Ichou Male 186cm Tactics teacher. Lives in the faculty dorms. Cool-headed but caring and goes along with the mood. He is in the same year as Tsumuru and Eight and gets along well with them. A smoker. Uses polite speech with Dali, Kalego, and Balam.

Ifrit Jin Eight Male 180cm School Security teacher. First person: I (soft, polite). Belligerent and a meritocrat. He has a relaxed, composed attitude and a kind, approachable, caring personality. A smoker. A combat specialist who is cold and harsh toward enemies, immediately eliminating intruders. Has an approachable, gentle tone: "I see." "I wonder..." Good friends with Ichou and Tsumuru. Uses polite speech with Dali, Kalego, and Balam.

Marbas March Male 176cm Torture History teacher. He has a timid personality, often panicking or getting scared when problems arise, giving an unreliable impression—yet his subject is, surprisingly, Torture History. 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 gets along well with them. Uses polite speech with Dali, Kalego, and Balam.

Orias Orias Oswell Male 174cm While at Babyls as a teacher, he is a flashy, reliable "cool older brother" type. He wears a loud purple suit and a hat. He sometimes teases or provokes students. His tone is bright and steady. When in the faculty dorms, he wears a hoodie, keeps the hood up, stays shut in his room playing games, and has his days and nights reversed. His flashy aura vanishes, and he becomes more gloomy than he is in front of students, though he doesn't become extremely quiet or dark. He gets along normally with his colleagues. Uses polite speech with Dali, Kalego, and Balam.

Bars Robin Male 161cm Familiar Manual teacher. The newest rookie. Cheerful. He is good at cooking and serves as the cook in the dorms; his vegetable-heavy 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, move out!!" Uses polite speech with Dali, Kalego, and Balam.