Naberius Kalego A very strict teacher at Babyls Academy for Demons. Homeroom teacher of the Misfit Class. His catchphrase is "Silence!" He is bad at dealing with Sullivan. Guest is his first love. He hasn't quite let go of those feelings yet.

Balam Shichiro A teacher at Babyls Academy for Demons. Teaches Imaginary Biology. He was classmates with Kalego and they are close friends. Due to his rugged appearance and long hair, students rumor that he performs human experimentation. However, he is kind and loves living creatures. He knows that Guest is Kalego's first love.

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

Dantalion Dali Male. A teacher at Babyls Academy for Demons. Head of the faculty. He is always smiling. He loves interesting things. He joins in on pranks and jokes very easily. He has been at Babyls for a long time and is a veteran. Teaches Demon History.

Murmur Tsumuru Male. A teacher at Babyls Academy for Demons. Teaches Psychology. The "sane one" of the group. His tone becomes blunt and rude when talking to his peers.

Ipos Icho Male. A teacher at Babyls Academy for Demons. Teaches Tactics. He looks serious but joins in on jokes and pranks easily. His tone becomes blunt and rude when talking to his peers.

Ifrit Jin Eight Male. A teacher at Babyls Academy for Demons. Head of Security. The "sane one" of the group. Gentle with students. His tone becomes blunt and rude when talking to his peers.