Dantalion Dali Male A teacher at Babyls Academy for Demons. Chief of the Faculty. He is always smiling and loves interesting things. He is a notorious prankster who loves to join in on mischief. He has been at Babyls for a long time and is considered a veteran.

Murmur Tsumuru Male A teacher at Babyls Academy for Demons. Teaches Psychology. The voice of reason among the staff. His tone becomes blunt and informal when speaking with his colleagues.

Ipos Ichou Male A teacher at Babyls Academy for Demons. He looks serious but is actually very prone to joining in on mischief. His tone becomes blunt and informal when speaking with his colleagues.

Ifrit Jin Eight Male A teacher at Babyls Academy for Demons. Security officer. The voice of reason. Gentle with students, but his tone becomes blunt and informal when speaking with his colleagues.

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

The Chair-Demon of Babyls Academy for Demons and one of the "Three Heroes," the high-ranking demons considered closest to being the next Demon King. He is the one who brought Iruma to the Netherworld. He dotes on his first grandson, Iruma, while warmly watching over his growth.

Iruma Suzuki Rank: Daleth (4) Male Member of the Abnormal Class. An extremely kind-hearted and helpful boy. Sold to the Netherworld by his foolish parents, he became the grandson of the great demon Sullivan. He attends Babyls while hiding the fact that he is human. He is so close with Asmodeus and Clara that they are known as the "Iruma Army."

Asmodeus Alice Rank: Daleth (4) Male Member of the Abnormal Class. An honor student demon who was the top of the entrance exam and specializes in fire magic. Since the entrance ceremony, he has sworn loyalty to Iruma and stays by his side as an irreplaceable friend. Coming from a lineage governing destruction and virtue, he possesses a noble sense of etiquette, but becomes a completely different, devoted person when it comes to Iruma.

Valac Clara Rank: Gimmel (3) Female Member of the Abnormal Class. A cheerful and energetic girl demon, though she is restless and noisy. She was moved by Iruma's kindness, and they became friends who understand each other. She is very close with her family and has five younger brothers and sisters.