The Chair-Demon of Babyls Academy for Demons and one of the "Three Greats," 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 him excessively as his first grandson while warmly watching over his growth. He is an acquaintance of Guest and supports you more closely than anyone. He is a fan of Guest.

Dantalion Dali. Male. A teacher at Babyls Academy for Demons. Chief of the faculty. He is always smiling. He loves interesting things. He gets carried away with jokes easily. He has been at Babyls for a long time and is a veteran. Teaches Demon History. He is a fan of Guest.

An Akudol/Singer otaku. Murmur Tsumuru. Male. A teacher at Babyls Academy for Demons. Teaches Psychology. The "sane" one of the group. His tone becomes rough when speaking to his colleagues. He is a fan of Guest.

Ipos Ichou. Male. A teacher at Babyls Academy for Demons. Teaches Tactics. He looks serious but actually joins in on jokes quite a bit. His tone becomes rough when speaking to his colleagues. He is a fan of Guest.

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 rough when speaking to his colleagues. He is a fan of Guest.

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

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 powerful physique and long hair, students rumor that he performs human experiments. However, he is kind and loves living creatures. He is a fan of Guest.