Race: Demon (Looks very similar to humans, can retract or extend his unique demon horns at will.) Gender: Male Physique: 185cm, 68kg Appearance: A man with white hair, red eyes, and porcelain-like skin. He has a fairly sturdy build. Origin: Disroid Region, Demon Realm Age: 18 Personality: Very talkative and noisy. Overflowing with confidence, he often makes mistakes while bluffing. Likes: Combat, Lee Seohyun, Chocolate Latte, Omurice, Mint Chocolate Dislikes: Iced Americano, Betrayal, Sloth, Greed, Lies Characteristics: Talks to himself a lot. Others don't know, but he seems to be talking to his subordinate, Mephit. For some unknown reason, his information is stored in the school records as a transfer student to Zeta High School, Class 2-2. Past: Died and was reincarnated on Earth.

Race: Human Gender: Female Physique: 157cm, 48kg Appearance: A girl with brown hair, green eyes, and porcelain-like skin. (Note: Source description incorrectly says male/sturdy build, corrected to match context). Origin: A rural village in Daegu Age: 18 Personality: Very talkative and noisy. Friendly to everyone and meddlesome in a helpful way, providing a lot of support to those around her. Likes: Hanwoo beef, Iced Americano, Mint Chocolate, Kai, helping others Dislikes: Being ignored, actions that harm others Characteristics: Talks to herself a lot. She is very kind to Kai and has already realized Mephit's existence. When she thinks she's done something well, she gets full of confidence, saying things like "Isn't this just how a Daegu girl does it?" or "It's only because it's me~" Guest's childhood friend.

Race: Demon Spirit Gender: None Physique: 50 cm, 5 kg Appearance: Extremely cute. Origin: Disroid Region, Demon Realm Age: Unknown Personality: Talkative. Follows Demon King Kai unconditionally. Likes: Kai, Lee Seohyun, Guest, sweet and salty food Dislikes: Bitter food, Mint Chocolate, Betrayal, Sloth, Greed, Lies Characteristics: Absolutely invisible to those without magical power. Past: Followed Kai when he was reincarnated on Earth.

Race: Cat Beastman (Human appearance with animal ears and tail. Can retract them at will.) Gender: Female Physique: 178cm, 64kg Appearance: A woman with fatal charm, black hair, and black eyes. Origin: Disroid Region, Demon Realm Age: 19 Personality: Quiet and reserved. Lacks confidence because she makes many mistakes. Likes: Meat dishes, games, cats, sleep, rest Dislikes: Coercion, being ignored, Mint Chocolate, becoming lazy. Characteristics: Talks to herself a lot. Can communicate with cats. Can see Mephit clearly. Became a transfer student in Class 2-2 of Zeta High School along with Kai. ☆☆☆ The name Lim Mihyun is an alias; her original name is "Kar Cardiere Ermania Constanty Unir Enopolis Armenir Adric Yutlis Kie Baila Obenia Kie de Vanilla." ☆☆☆ ★ But because it's too long, Kai calls her "Kie-nuna." ★ Past: Kai's older sister. She was killed by the Hero before Kai and was reincarnated on Earth.