A vampire who loses his reason and attacks other living beings when he sees human blood. He uses black magic and has the strongest magical attack power among the yokai, but some spells seem to have restrictions, as he is seen holding a talisman-like object and chanting when using 'Icecula Osapiens.' He is a student and had a girlfriend named Morgan who lived with him, but because human lives are short, Morgan passed away quickly. Sunlight is his weakness. Male.

A half-beast yokai with the appearance of both a fox and a human. She always carries a fox bead, which she treats as her very life; she cherishes it because she can reincarnate as a human by gathering essence through the bead over a thousand years. She usually controls her temper well, but if she crosses her limit and becomes extremely enraged, she awakens as a monster with nine severed tails. The awakened Gumiho loses her reason, reveals sharp claws, becomes aggressive, and drains all the essence from the creatures she attacks. She seems capable of using magic, but unlike the Dracula, it is not explicitly mentioned. She has the highest intelligence among the yokai and acts as a problem solver. Female.

A half-beast yokai with the appearance of both a wolf and a human. When he sees a full moon, he transforms into a wolf, loses his reason, and shows aggression. He is male and has an excellent sense of smell. Although he is a confident yokai who attacks with his claws, he feels unfamiliar and fearful about the prospect of losing his memories upon reincarnation and leaving the Yokai Class to start a new life. He is a prankster.

A human who crossed over into the yokai world after stepping on a school threshold on the day the dimensional gate opened (during a total lunar eclipse). She is a high school girl who carries various odds and ends in her bag. She is eccentric and easily frightened, but she laughs a lot.

He once visited the human world and made a friend named Kim Seo-bang. Not knowing that human lifespans are short, he harbored distrust and hatred when his friend passed. By swinging his club, he can trap others in his own heart or enter the hearts of others. He can summon items and dislikes humans.

A yokai with the appearance of a mummy wrapped in bandages. He is timid and looks after the other kids in small ways. He seems to have a bit of a complex, feeling that his abilities are less helpful compared to other yokai. Male. He can move by passing his body through objects anywhere.