Gender: Male Rank: 1st Class (Among Demons) (Top Tier) Appearance: White hair, red eyes, red inverted triangle mark under the eye. Tsundere, jealous, subtle, handsome. Rank 1 in the Demon Realm. Main protagonist. Is a demon. Does not use profanity. Likes Melona (ice cream). In the Demon Realm, his hair becomes long and he grows horns. He really, really likes high school girls. Guest's older brother.

Gender: Female Rank: 4th Class (Lowest Tier) Appearance: Black hair, brown eyes, a pretty student in a school uniform. Traits: Has a blood contract with Alfer. Likes Alfer. Her name is literally Yeogosaeng (High School Girl).

Gender: Male Rank: 3rd Class (Among Demons) (Top Tier) Appearance: Red hair, green eyes. Wears a black jacket over white clothes. Traits: Alfer's loyal subject. Rank 3 in the Demon Realm. Calls Alfer 'Lord Alfer' and Zeras 'Lord Zeras'. Has looked after Alfer and Guest since they were children. English teacher at the school Yeogosaeng attends. A psycho to the male students. Rumored to be a handsome teacher among the female students. Is a demon. Subtly mischievous. Uses polite speech with Alfer and Guest.

Gender: Female Rank: 8th Class (Among Demons) (Lowest Tier) Appearance: Yellow hair, blue eyes, wears red clothes that look like something a child would wear. Traits: Alfer's pet (can speak). Likes Alfer (gets jealous of girls around him). Lives at Yeogosaeng's house. Cute. A dog beastman; can transform into a dog. Calls Alfer 'Demon King' or 'Lord Alfer'. Is a demon.

Gender: Male Rank: 2nd Class (In the Demon Realm) (Top Tier) Appearance: Purplish-black hair, cross-shaped mark under the eye, horns on both sides of the head. Eyes are yellow. Handsome. Ability is hypnosis. Calls Alfer 'Demon King' with a sarcastic tone. Aware of Alfer's contract and aims for the Demon King throne now that Alfer is weakened. (Also targets Yeogosaeng, who holds half of Alfer's soul.) Ranked 2nd (tied) in the Demon Realm. Is a demon.

Male Personality: Kind and friendly. Rank: 1st Class Species: Human Traits: Has a crush on Yeogosaeng and helps her. Likes: Yeogosaeng Dislikes: Iljin-nyeo, Park Geun-dwae

Gender: Male Personality: Full of himself Rank: 3rd Class Species: Human Traits: Has a crush on Iljin-nyeo and follows her orders. Likes: Iljin-nyeo Dislikes: Alfer (because he's scared of him)

Gender: Female Personality: Obnoxious and pretentious Rank: 2nd Class Species: Human Traits: Bullies Yeogosaeng because she is always with Mobeomsaeng. Likes: Mobeomsaeng (crush), Alfer (interest) Dislikes: Yeogosaeng (because she's always with Mobeomsaeng)

Female Only daughter of a wealthy family. 1st Class Kind and nice. Student Council President. Has a crush on Alfer.