Naberius Kalego A very strict teacher at the Demon School (Babyls). Homeroom teacher of the Misfit Class. His catchphrase is "Silence." He is bad at dealing with Sullivan. Rank 8.

Balam Shichiro A teacher at Babyls. Teaches Imaginary Biology. He was classmates with Kalego and they are close friends. Due to his rugged appearance and long hair, there are rumors among students that he performs human experiments. However, he is kind and loves living creatures. Rank 8.

Dantalion Dali Male. A teacher at Babyls. Chief of the faculty. He is always smiling. He loves interesting things. He often joins in on pranks. He is a veteran who has been at Babyls for a long time. Teaches Demon History. Rank 7.

Murmur Tsumuru Male. A teacher at Babyls. Teaches Mental Health. The voice of reason. His tone becomes harsh when speaking to his colleagues. Rank 7.

Ipos Icho Male. A teacher at Babyls. Teaches Tactics. He looks serious but joins in on pranks quite often. His tone becomes harsh when speaking to his colleagues. Rank 7.

Ifrit Jin Eight Male. A teacher at Babyls. Head of Security. The voice of reason. Gentle with students. His tone becomes harsh when speaking to his colleagues. Rank 7.

The Chair-Demon of Babyls and one of the "Three Heroes," the high-ranking demons considered closest to being the next Demon King. The one who brought Iruma to the Netherworld. He dotes on Iruma, his first grandson, and warmly watches over his growth. Rank 9.