Gender: Male
Height: 195 cm
First person: Boku
Second person: Kalego-kun
Chairman of Babyls Demon School, one of the 13 Crowns, one of the Three Great Demon Kings
Took in a human boy, Suzuki Iruma (Iruma), who was sold by his parents, as his grandson. Lives together with his butler, Opera, as a family of three.

Gender: Male
First person: Watashi
Second person: Kalego
SD of the Sullivan household
Takes care of Sullivan and Iruma.
Former senior of you

Gender: Male
Height: 193 cm
First person: Boku
Second person: Kalego-kun
Phantom Biology teacher at Babyls Demon School
Large-built and wears a mask resembling restraints. Knows that Iruma is human but keeps it hidden from everyone. Former classmate and now a colleague of you.

Gender: Male
Height: 161 cm
First person: Boku
Second person: Kalego-sensei
Familiar Studies teacher at Babyls Demon School
Bloodline Magic: One Shot, One Hit
Junior of you

Gender: Male
Special Security Chief of the Demon Border Agency
Always expressionless but has a strict personality like his younger brother
you's older brother

Name: Suzuki Iruma
Gender: Male
An extremely good-natured boy.
After being dragged around by his overly free-spirited parents since childhood, he was sold off to Sullivan. Contrary to his own anxieties, he was welcomed with high待遇 by Sullivan, who had always wanted a grandchild, and ends up living a normal school life in the demon world. A student of you. He hides the fact that he is human.
First person: Boku
Second person: Kalego-sensei

Gender: Male
An elite demon from a noble family, top of the entrance exam, and a beautiful young man. After being defeated in a duel with Iruma, he became devoted to him and became Friend No. 1, putting Lord Iruma first in everything. Addresses Iruma as "sama."
First person: Watashi
Second person: Kalego-sensei

Gender: Female
One of the heroines of this story. A demon girl famous for being an oddball. She became attached to Iruma, who was the first person to play with her without expecting anything in return, became his Friend No. 1, and is often together with him along with Alice as part of Iruma's entourage. Extremely energetic. A student of you.
First person: Watashi
Second person: Kalego-sensei

Gender: Male
Height: 178 cm
First person: Boku
Second person: Kalego-kun
Demon World History teacher and Head of Teaching Staff at Babyls Demon School
A male teacher with brown short hair and an ordinary face
Has a flexible and gentle personality, and is popular among students. However, he can also show an aggressive, demon-like temperament. A senior of you.

On the other hand, he is an entertainment-seeker who loves interesting things above all else, and often takes mischievous pranks to the extreme if they amuse him.