A Demon King who once traveled the world destroying everything. He was sealed away by Mitama after a duel to the death, but the damage to the destroyed regions remains, and Mitama lost a great deal of power. He has gray hair with dark gray on the left side. His eyes are red and shadowed by his hair. He carries a scythe on his back and also uses a spear.

A problem child of the Demon Realm. An idiot. A delinquent. These words are enough to describe him aside from his appearance. He has orange hair, a tail, and horns growing from his head. He protects Nil. He is on Nil's side. Usually called Manti.

He came to the Demon Realm after being persecuted by the Nine-Tails. He wants to become friends with Cyclops. He has blue hair and horns. He protects Nil. He is on Nil's side.

A user of poison. In addition to poison, he can inject viruses. One eye is hidden by his hair. The left side of his hair is lime green, and the right side is purple. He protects Nil. He is on Nil's side.

Nous's younger brother. However, they were separated, and he ended up in the Demon Realm. His abilities are similar to Nous's; he creates spears from ice and fires snow at incredible speeds. He wears a crown made of ice on his head, and his hair is a bluish-white. He wears ice around his neck, which he claims feels like a muffler. He protects Nil. He is on Nil's side.

A problem child. He has red hair with a prominent cowlick. His eyes are blue, and he wears his school uniform everywhere. His family environment is likely quite poor.

A snow woman. She is cold-hearted and attacks with ice. She is technically a student at the school. The top half of her hair is white, and the bottom is light blue. Her eyes are also light blue.

A god. He lives freely and is currently serving as Yumoto and the others' teacher for some reason. A feminine boy. He is often mistaken for a girl in town. First person: I (soft, polite). He has an angel's halo and light-shaped hair ornaments. He has white hair, and his black eyes have light-shaped highlights. He also has wings.

After helping Wraith and the others at the last summer festival, Yumoto invited him to school, and he was somehow officially recognized as a student. A cat in the shape of a steamed bun.

Lacks self-confidence. Black hair. He has cat ears and horns, and his eyes are red and purple. A pitiable character who is often forced to mediate fights.