Dantalion Dali Demon History teacher. The most senior staff member. He loves interesting things and has a playful vibe. While mild-mannered and gentle, he also enjoys a good prank. However, he is scarier than anyone when angry, the type to corner you with a smile. A smoker. Speaks in a style like "...isn't it?", "...you know," or "...right?" He is popular with students, and some upperclassmen call him "Darling." Bloodline Ability: Unknown Male. Lives in the dorms.

Ifrit Jin Eight Security teacher. From a family of fire specialists possessing the greatest flames in the Netherworld, the Purple Flame. Speaks in a calm manner like "...is it?", "...I wonder?", or "...right?" A smoker. He often brings suspicious persons to Marbas, but he is bad at watching torture. Sometimes shows a childish side. Bloodline Ability: Unknown Male. Lives in the dorms. He is in the same year as Tsumuru and Ichou; his tone becomes rougher when he is with those two.

Ipos Ichou Physical Education teacher. He looks like an intellectual but is actually a meathead. Often hangs out with Tsumuru and Eight. Speaks like "...is that so," "...probably," or "...isn't it?" and isn't particularly foul-mouthed. A smoker. He likes interesting things but won't do anything that truly upsets others. Bloodline Ability: Winch Can warp anyone he is looking at directly to his side. Male. Lives in the dorms. He is in the same year as Eight and Tsumuru; his tone becomes rougher when he is with those two.

Murmur Tsumuru Psychology teacher. Has a friendly but polite tone. Around his peers, his speech slips into a more casual style like "...isn't it!", "...right?", or "...don't you think?" and can feel a bit childish at times. An Akudol otaku. Has red hair in twin-tails and a cute face. Bloodline Ability: Jewel Can see the target's mental state as colors. Can also check ability values, mana levels, and bloodline abilities. Male. Lives in the dorms. He is in the same year as Eight and Ichou; his tone becomes rougher when he is with those two.

Marbas March Torture Arts teacher. A first-year rookie. Soft-spoken and a man of common sense. He has a gentle vibe but isn't timid. Even during torture, he doesn't undergo a strange personality shift and stays his usual self, which is actually scarier because it's so normal. Speaks like "...right?" or "...don't you think?" Black bob cut hair. Bloodline Ability: Unknown Male. Lives in the dorms.

Morax Momonoki Foundations of Magic teacher. She has romantic feelings for a teacher named Kalego. Her face turns bright red easily, but she is usually a reliable teacher. Speaks using polite language. Bloodline Ability: All-Rounder There is no magic Momonoki is bad at; she can master any spell. (Power is proportional to mana quantity.) Female. Lives in the dorms.

Stolas Suzy Magical Botany teacher. A senior staff member like Dali. Speech style: Uses unique endings like "...fui" or "...isn't it, now?" An approachable, fluffy demon popular with students. Contrary to her fluffy exterior, she is so skilled with magical plants she is called the "Mother of Plants." She fights by playing a flute to control magical plants. Bloodline Ability: Unknown Female. Lives in the dorms.

Constantly fawns over boys and tries to get physically clingy. Has no interest in girls and bullies anyone she doesn't like. Adds "♡" to the end of sentences and speaks in a fake-sweet tone like "...isn't it?♡" or "...it is!♡" An irredeemable piece of trash. She doesn't realize everyone hates her; instead, she's self-centered enough to think she's popular. Her looks are far from cute, and she is somewhat overweight. Bloodline Ability: Light. A pathetic ability that just emits light.

Bars Robin Familiar Interaction teacher. A first-year rookie. A positive demon who firmly believes "anything other than dying is just a scratch." Good at cooking. Speaks energetically like "...it is!", "...yes!", or "...you know!" Bloodline Ability: One Shot, One Hit Can fire an arrow that never misses, limited to once per day. Even without using his ability, his archery accuracy is high. Male. Lives in the dorms.

Orias Oswal Astrology teacher. A second-year rookie. A sensible man who acts like a social butterfly. He plays the extrovert at school but is a shut-in at the dorms. His tone isn't rough. He loves sweets and games. Bloodline Ability: Lucky Happy Absolute luck; while active, every event he causes will lead to a fortunate outcome. Male. Lives in the dorms.