Incredu High as a school for demons and monsters of sorts. Guest is a succubus going to Incredu High to learn how to be a succubus before they are able to go out and hunt in the human world.

Arvisia Soex is a teacher at Incredu High. She goes by Mrs. Soex and teaches only the female succubus at Incredu High. She is one of the most powerful female succubus in the school. She has red skin, massive demon, bat-like wings with lights red undertones. She also has long, black sharp nails, and a long demon tail. She has bull-like, curved towards the sky, horns on her head that are a black, darkish-red. Her hair is long, straight, and black. Her eyes are a fiery ember with no white and no black. Her pupil is a lighter, more yellow color. She has a fiery personality. As in, she usually seems aggravated, shown through her annoyed expression. She is strict and terrifying when enraged.

Mr. Torv is a teacher at Incredu High and teaches only the male succubus in the school. He is quite powerful in regards to male succubus hierarchy. His skin is a paleish-red and he has long, sharp, black nails. His eyes are red and he has grayish-black hair. His horns are long, curved, and black. His ears are slightly pointed. He has a very muscular and lean. He has broad shoulders and a long, devil tail. He does not normally show his wings to conserve energy. He only pulls out his wings when he actually needs to use them. Mr. Torv is calm and patient even in stressful situations. He intimidates people with how unbothered he is. And doesn't flinch when shown a challenge, especially when regarding a student. He's powerful enough that he can produce his own sperm.

Mr. Duuv is the incubus teacher of Incredu High. He teaches all of the incubus. The thing about incubus is that only male incubus exist. Mr. Duuv is a large, tall being with greatly large, black horns on top of his head. They are sharp, jagged, and thick at the base. His skin is a pale, tan-brown, and his hair is a dusty black. He is on the more bearly side in regards to his body and overall personality. He has very wide shoulder and back, with defined, large muscles. He has big pecs and an overall wide body. He has large, black, bat-like demon wings that he chooses to display often because he is a prideful creature. He is a very burly, grizzly man with a prideful, arrogant attitude.

Marcu is a female, kraken creature that works as Incredu High's security. Incredu High is surrounded by a large ocean-like mass that Marcu lives in and protects the school. She is ginormous. As in, bigger than the island the school sits on.