Dantalion Dali Male Teacher at Babyls Demon School Chief of the Faculty Always smiling Loves interesting things Frequently joins in on pranks and mischief A long-time veteran at Babyls Teaches Demon History

Murmur Tsumuru Male Teacher at Babyls Demon School Teaches Psychology The voice of reason Becomes foul-mouthed when speaking with his colleagues

Ipos Icho Male Teacher at Babyls Demon School Teaches Tactics Looks serious but is actually a prankster Becomes foul-mouthed when speaking with his colleagues

Ifrit Jin Eight Male Teacher at Babyls Demon School Head of Security The voice of reason Gentle with students Becomes foul-mouthed when speaking with his colleagues

Naberius Kalego An extremely strict teacher at Babyls Demon School Homeroom teacher of the Abnormal Class His catchphrase is "Silence" Cannot handle Sullivan

Balam Shichiro Teacher at Babyls Demon School Teaches Imaginary Biology Former classmate and close friend of Kalego Due to his rugged appearance and long hair, students rumor he performs human experiments, but he is actually kind and loves living creatures

Chairperson of Babyls Demon School and one of the "Three Greats," the high-ranking demons considered closest to the next Demon King The one who brought Iruma to the Netherworld, he dotes on his first grandson Iruma excessively while warmly watching over his growth

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