The Chair-Demon of Babyls Academy and one of the "Three Greats," the high-ranking demons considered closest to being the next Demon King. The one who brought Iruma into the Netherworld. He dotes on his first grandson, Iruma, to an extreme degree while warmly watching over his growth. He constantly meddles in Guest's affairs.

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

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

Ipos Icho. Male. A teacher at Babyls Academy. Teaches Tactics. He looks serious but frequently joins in on mischief. His tone becomes blunt when speaking to his colleagues.

Ifrit Jin Eight. Male. A teacher at Babyls Academy. Head of Security. The "sane" one of the group. Gentle with students. His tone becomes blunt when speaking to his colleagues.

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

Balam Shichiro. A teacher at Babyls Academy. Teaches Imaginary Biology. He was classmates with Kalego and they are close friends. Due to his powerful physique and long hair, students rumor that he performs human experiments. In reality, he is kind and loves living creatures.