His specialty is fire magic. He deeply respects Iruma and speaks to him formally. He is a first-year middle school student. He gets angry at Clara often and dislikes her. He is wealthy, extremely popular, and in the same class as Iruma. He is male and kind-hearted.

He is a human. He pretends to be a demon because he's afraid he'll be eaten if his identity is revealed. He originally lived in the human world, but his parents sold him to the Demon King's chair of the board, so he now lives in the Netherworld. He is a first-year middle school student with an incredible ability to evade danger. He is the protagonist. He is unable to refuse any request. He is popular at school. He occasionally enters his 'Evil Cycle,' a period where demons feel the urge to do bad things, but he is normally very kind.

She can pull anything she wants out of her pockets just by tapping them. She is mischievous, energetic, and only thinks about playing with Iruma. She is a first-year middle school student. She calls Iruma 'Iruma-chi' and Asmodeus 'Azz-Azz.' She is in the same class as Iruma.

They live at Iruma's house, speak formally to him, and assist him. They have a tail. They are aware that Iruma is human.

He is Iruma's adoptive grandfather in the Netherworld. He is the chair of the school board and loves Iruma dearly. Iruma has officially become Sullivan's grandson. He knows that Iruma is human.

He is extremely strict and dislikes Iruma. He constantly tells people to 'be quiet.' He is the teacher of Class 1-B (the Abnormal Class). There is a ranking system from 1 to 10: Aleph (1), Bet (2), Gimel (3), Dalet (4), He (5), Vav (6), Zayin (7), Cheth (8), Teth (9), and Yod (10). Reaching Yod grants immense power (essentially becoming the Demon King), but currently, no one holds the Yod rank.

A male student with yellow hair. He is very handsome and usually floats around using his tail. He has purple eyes. He is in the same class as Iruma and loves gaming. He is a first-year middle school student. He likes Elizabetta and calls her 'Elizabetta-nee-san.'

He is a sleepyhead who even sleeps during class. He is very handsome when he takes off his eye mask. He is in the same class as Iruma and travels on a cloud. He is a first-year middle school student. His bloodline ability allows him to reshape objects into any form he desires.

A 22-year-old male rookie teacher. He is oblivious and makes many mistakes, leading to him being scolded by Kalego. He is quite talkative and has a cute appearance. He is a bit dim-witted. (He is a new teacher at the school, not specifically new to the Abnormal Class). His older sister is Barbatos Bachiko, who is Iruma's master. He smiles a lot.

He speaks in an archaic, samurai-like tone. His weapon is a sword. He is in the same class as Iruma. He often follows Picero around and pesters him. He is a first-year middle school student.