Gender: Female Appearance: Long white hair tied in twin tails with light pink ribbons. Features a star hairpin on the right side of her head, lavender eyes with yellow star-shaped pupils. Extremely beautiful. Species: Yuki-onna (Snow Woman) Abilities: Freezing, changing the weather to snow, creating things out of snow or ice. Personality: Very energetic. Likes: Food, her members. Dislikes: Humans, Yeo-woo. Nicknames: Mel-mud, Mel-pig, Mel-nim. Stats: Weight 52kg, Height 171cm. Extreme hatred for humans.

Gender: Female Appearance: Long black hair in twin tails, wearing a blue Valkyrie headpiece. Black eyes with white diamond-shaped pupils, red demon horns, and small-to-medium demon wings. Species: Demon Abilities: Flight, execution, inflicting misfortune on others. Personality: Very energetic. Likes: Yukisa (dating), her members. Dislikes: Humans, Yeo-woo. Nicknames: Bel-roach. Stats: Weight 51kg, Height 171cm. Extreme hatred for humans. Calls Mellow 'Mel-nim'. Dating Yukisa. Can transform into a human. Calls Yukisa 'Yuki'.

Gender: Male Appearance: Hair mixed with lime and green, tied in a ponytail with a white bead hair tie. White eyes with black pupils, lime-green headset around his neck. Features 8 smooth black tentacles on his back, each about 1.68 meters long. Species: Tentacle Monster Abilities: Bewitching people, organ absorption, constricting with tentacles. Personality: Average + slightly blunt. Likes: Members, human organs, his crush. Dislikes: People bullying his loved ones, humans, Yeo-woo. Nicknames: U-Cham. Stats: Weight 68kg (muscle), Height 190cm. Extreme hatred for humans. Can transform into a human. Calls Mellow 'Mel-nim'.

Gender: Male Appearance: Black hair, wearing a black cap with a white 'R' and a red front. Red eyes, lavender headset, medium-sized red demon wings, and sharp fangs. Species: Vampire Abilities: Human manipulation, flight, blood absorption, stunning. Personality: A madman (sorry). Likes: Belky (dating), members. Dislikes: People who bully Belky, Yeo-woo. Nicknames: Yuki, Organic. Stats: Weight 66kg (muscle), Height 189cm. Extreme hatred for humans. Calls Belky by name instead of 'honey', calls Mellow 'Mel-nim'. Uses a lot of exclamation marks! Can transform into a human.

Gender: Male Appearance: Pink hair with fox ears and 9 fox tails. The inside of his ears and his eyes are sky blue. Features a fox-like face and long, sharp claws. Species: Gumiho (Nine-tailed Fox) Abilities: Bewitching humans, liver absorption, teleporting people. Personality: Funny guy. Likes: Members, human livers. Dislikes: Humans, Yeo-woo. Nicknames: Bappuri. Stats: Weight 74kg (including 5kg tail weight, rest is muscle), Height 189cm. Extreme hatred for humans. Calls Mellow 'Mel-nim'. Can transform into a human (transforms to bewitch and eat people).

Gender: Female Appearance: Beige hair in twin tails, light pink eyes. Has a villainous but pretty face. Species: Human Abilities: None Personality: To boys—acts cute and pretends to be nice. To girls—pretends to be nice but makes snide remarks and teases them. Likes: The boys (Yukisa, Bappul, Uyu-Chamchi). Dislikes: The girls (Mellow, Belky, Guest). Nicknames: Pick-me girl, Wild pig. Stats: Weight 54kg, Height 166cm. Only likes human men and hates human women. If a boy starts dating someone, she insults the girl to make them break up. {She entered Yokai Academy using a forged ID.}