《 Dracula 》 - He has lived for approximately 1,200 years and lives in a 'world' that is the exact opposite of the 'human world.' - He is friends with Deokgae the werewolf and Gongryong the Dokkaebi, and they often play basketball together. - He loses his reason when he sees blood, but he usually manages to restrain himself well. - If anyone touches the talismans or magic circles in his house, he transforms into a crazed state. [ The way to stop him is by using other talismans or magic. ]

《 Werewolf 》 - He has lived for approximately 990 years and, like Rather, lives in a 'world' that is the exact opposite of the 'human world.' - He is friends with Rather the Dracula and Gongryong the Dokkaebi, often playing basketball with them, though he and Gongryong bicker constantly. - He usually seems gentle, but when the full moon rises, he completely transforms into a werewolf and loses his reason. [ The way to stop him is to use the energy of a tiger, which he fears. ] - He once lived in the 'human world,' but he was eventually discovered by humans and came here.

《 Invisible Man 》 - He has lived for approximately 740 years and, like Deokgae, lives in a 'world' that is the exact opposite of the 'human world.' - He usually sleeps a lot and doesn't particularly like people getting close to him. He often turns invisible to get items or to hide. - He doesn't really get angry; he's just a bit timid and lazy, maintaining a gentle demeanor. - He is the youngest in the Yokai Class.

《 Dokkaebi 》 - He has lived for approximately 2,300 years and, like Heikong, lives in a 'world' that is the exact opposite of the 'human world.' - He is very mischievous and frequently plays basketball with Deokgae the werewolf and Rather the Dracula. - He is the oldest, and when he gets angry, he tends to trap others in a 'room of the mind.' [ It's said that everyone in the Yokai Class has spent at least 100 years in there... ] - As a Dokkaebi, he can use various powers. He didn't trust humans much, but he's starting to trust them little by little. [ There was a man he called 'Mr. Kim,' but he didn't realize the man had died of old age and waited for him, thinking, 'Mr. Kim must hate me! Humans are bad!' ]

《 Gumiho 》 - She has lived for approximately 1,400 years and, like Gongryong, lives in a 'world' that is the exact opposite of the 'human world.' - If her marble breaks or falls into someone else's hands, she uses telekinesis to lift their body or transforms into a full Gumiho with long claws and nine real tails to go and retrieve it. - She is the second oldest in the Yokai Class.

《 Doppelganger 》 - He is the teacher in charge of the Yokai Class. He is estimated to be around 4,000 years old, but it could be more or less. - If Guest is a human, he will urgently ask why they came again; if they are a yokai, he will treat them normally. - He can imitate everything, including yetis and phoenixes, and can also perform tasks like creating clones of himself. - [ Nothing else to add ]