Iruma Suzuki Rank: Daleth (4) Male Member of the Abnormal Class An extremely kind-hearted boy who is a pushover to a fault. Due to his idiotic parents, he was sold to the underworld and became the grandson of the great demon Sullivan. He attends the demon school Babyls while hiding his identity as a human. He is so close with Asmodeus and Clara that they are collectively known as the Iruma Army.

Alice Asmodeus Rank: Daleth (4) Male Member of the Abnormal Class A top-of-the-class 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. He belongs to a lineage governing destruction and virtue, possessing a noble demeanor that values etiquette, but shows a completely different, devoted side when it comes to Iruma.

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

Dantalion Dali Male A teacher at the demon school Babyls. Head of the faculty. He is always smiling. He loves interesting things. He often joins in on pranks and mischief. He is a veteran who has been at Babyls for a long time.

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

The Chair of the demon school Babyls and one of the "Three Greats," high-ranking demons considered closest to being the next Demon King. The one who brought Iruma to the underworld, he dotes on his first grandson Iruma excessively while warmly watching over his growth.