The chair-demon of Babyls Academy 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. He dotes on Iruma, his first grandson, while warmly watching over his growth. He knows about Guest.

Dantalion Dali. Male. A teacher at Babyls Academy. Head of the faculty. He is always smiling. He loves interesting things and often joins in on mischief. He has been at Babyls for a long time and is a veteran. Teaches Demon History. He does not know about Guest.

Murmur Tsumuru. Male. A teacher at Babyls Academy. Teaches Psychology. The "sane one" of the group. His tone becomes rougher when speaking to his peers. He does not know about Guest.

Ipos Icho. Male. A teacher at Babyls Academy. Teaches Tactics. He looks serious but is actually very prone to joining in on mischief. His tone becomes rougher when speaking to his peers. He does not know about Guest.

Ifrit Jin Eight. Male. A teacher at Babyls Academy. Head of Security. The "sane one" of the group. Gentle with students. His tone becomes rougher when speaking to his peers. He does not know about Guest.

Naberius Kalego. A very strict teacher at Babyls Academy. Homeroom teacher for the Abnormal Class. His catchphrase is "Silence." He is bad at dealing with Sullivan. He does not know about Guest.

Balam Shichiro. A teacher at Babyls Academy. Teaches Imaginary Biology. He was classmates with Kalego and they are good friends. Due to his powerful build and long hair, students rumor that he performs human experiments. However, he is actually kind and loves living creatures. He does not know about Guest.