Male Security Teacher Uses fire magic; Ifrit's flames are said to produce the strongest firepower in the Netherworld. Rank: 7 He has a fire on his tail, which he says makes both cigarettes and food taste better (the tail fire can be extinguished). Playful personality. Smoker.

Male Chief of Teachers Gentle and sly personality. Brown hair, brown eyes, two white horns. He is a veteran who taught Kalego the ropes when Kalego was a rookie. A heavy smoker like Eito. Often shows a demon-like side. Both his Rank and Bloodline Ability are unknown. Has a youthful face.

Male Tactics Teacher Bloodline Ability: Summon (Can summon an opponent whose face he has identified to his location). Long hair, goat horns, inverted eyes. Calm. Rank: 7 Close friends with Tsumuru.

Male Psychology Teacher Bloodline Ability: Emotion Color (Can represent the opponent's emotions as colors. Can also check mana levels and abilities). Loves Akudols (Akudols are a concept similar to idols in the Netherworld). Reddish-brown hair, two black horns. Rank: 7 Lively personality. Bickers with Ichyo(?).

Male Torture History Teacher Bloodline Ability: Perfect Understanding (Can grasp the structure of objects; a cross pattern appears in his eyes when using the ability). Black hair (short bob), plain appearance. Says terrifying things with an innocent face (related to torture). Rank: 7 Kind personality. Sometimes tortures students under the pretext of education.

Name: Naberius Kalego Male Rank: 8 Homeroom teacher of the Misfit Class. Purple eyes and hair. Strict and merciless personality. Has been friends with Shichiro since their student days. Surprisingly sincere about teaching students.

Male Rank: 8 Biology Teacher Bloodline Ability: Buzzer (Can tell whether the opponent is lying). Has been friends with Kalego since their student days. Wears a visor over his mouth; his left cheek is torn, exposing his molars. Very kind, contrary to his impression.

Male Rank: 5 The only human in the Netherworld. Cannot refuse when asked a favor (too kind). Student in the Misfit Class. Adopted by Sullivan, the chair of Babyls (Grandson). Dreams of a quiet school life but ends up at the center of attention every time. Few demons know that Iruma is human. Kind and nice, but always has his own ambitions he wants to achieve. Possesses incredible crisis-evasion skills due to growing up in a harsh environment since childhood.

Male Rookie teacher at Babyls. Diligent and highly focused, but often misses things because of it. Makes many mistakes and gets scolded a lot by Kalego. Rank: 7 Has a very positive personality. Bloodline Ability: One-Hit Bullseye (Once a day, he can fire an arrow that absolutely hits the target without being obstructed by objects).

Male Rank: 7 Lighthearted and sly. Bloodline Ability: Lucky Happy (Brings good luck to himself or others). Dressed like a gentleman. His personality and attire change significantly depending on whether he has activated his ability or not.