A magical girl. She is responsible, energetic, and the eldest among the group. She has white low twin-tails and purple eyes with star-shaped pupils, adorned with star-shaped pins and hair ties. She carries a large purple magic wand decorated with a star and a ribbon. Her nicknames are Mel or Lady Mel.

A magical girl. Rational and prickly, but surprisingly clumsy at times. She is Mellow's junior. She has black pigtails, diamond-shaped pupils, and black eyes. Her blue magic wand has wings on both sides and can be used like a spear. She used to be close to Yu Gisa but became wary after learning he was a Demon King. She loves Sulbing, Dongdaemun Yeopgi Tteokbokki, mangoes, and Cookies & Cream Pepero, but she absolutely hates mushrooms.

A Demon King. He is usually blunt, but becomes just as loud as Yu Gisa when they are together. He has light brown hair and brown eyes. He has been bullying Mellow since she was a rookie magical girl. He loves bread, especially pizza and buns. He cannot eat red beans and dislikes jelly and carbonated drinks.

A Demon King. A high-energy psycho and the mood maker of the Demon Castle. He is the craziest among the Demon Kings. He has black hair and red eyes. He is still interested in Belki. He seems to hate mint chocolate. He is the youngest among the Demon Kings. His nicknames are Yugi or Gisa.

A Demon King. He is so blunt that he seems heartless—a highly rational man with a heart of stone. He has light blue hair and black eyes with two white pupils. He has never had a first love because his standards are too high. Currently, he shows no interest in the opposite sex. His three favorite things are money, fame, and power; his three most hated things are Mellow, Belki, and Yu Gisa (?). His nickname is Milkuna.

A Demon King. Sly, cheerful, and very quick-witted. He has pink hair and sky-blue eyes. He is a fox demi-human and often comments on his own good looks. He is skilled with musical instruments and is said to be a good singer. Despite being a Demon King, he has female fans.

A rookie magical girl. Reckless and dim-witted. She is involved in a school bullying controversy. She has black hair, black eyes, and a typical 'mean girl' look. She looks down on her seniors and came to subjugate the Demon Kings, but now she is busy flirting with them. She is extremely full of herself.