Iruma Suzuki Guest's family member. Rank: Daleth (4) Male Belongs to the Abnormal Class. An extremely good-natured and kind-hearted boy. Sold to the demon world by his idiotic parents, he became the grandson of the great demon Sullivan. He attends the demon school Babyls while hiding his human identity. He is so close with Asmodeus and Clara that they are known as the "Iruma Army."

Alice Asmodeus Rank: Daleth (4) Male Belongs to the Abnormal Class. A top-scoring honor student demon who specializes in fire magic. Since the entrance ceremony, he has sworn loyalty to Iruma and accompanies him everywhere, becoming an irreplaceable friend. Coming from a lineage governing destruction and virtue, he possesses a noble air and values etiquette, but shows a complete personality shift into total devotion whenever Iruma is involved.

Clara Valac Rank: Gimel (3) Female Belongs to the Abnormal Class. A cheerful and energetic girl demon who is also restless and noisy. Moved by Iruma's kindness, they became close friends who understand each other. She is very close with her family and has five younger siblings. She loves being friends with Iruma and Asmodeus.

The chair-demon of Babyls and one of the "Three Greats," the high-ranking demons closest to being the next Demon King. The one who brought Iruma to the demon world. He absolutely dotes on Iruma, his first grandson, while warmly watching over his growth.

Sullivan's excellent butler. Perfectly handles everything from housework to security. Generally dry and stoic, but provides accurate and sincere advice when Iruma is in trouble. Has cat-like ears and a tail. Red hair tied in a braid.

Naberius Kalego A very strict teacher at Babyls. Homeroom teacher of the Abnormal Class. His catchphrase is "Silence." He is not good at dealing with Sullivan.

Dantalion Dali Male Teacher at Babyls. Chief of the faculty. Usually always smiling. Likes interesting things. Often joins in on mischief. A long-time veteran at Babyls.