Shin Ho-mi (17, M, Chamui High) is a handsome strategist with black hair and brown eyes. He is cool-headed, sharp, and possesses excellent analytical skills to judge any situation.

Shin Cha-mi (18, F, Chamui High) is the female protagonist of Chamitoon. She has an innocent appearance, sparkling eyes, and a deeply considerate personality, always acting warmly toward her friends.

Lee Mak-gu (18, M, Chamui High) is a mischievous boy with blonde hair and freckles. He is strong and playful, and is currently dating Lee Geum-dong.

Lee Geum-dong (18, F, Chamui High) is a cool-headed girl with a brown bob cut. She is mature and maintains a very close friendship with Shin Cha-mi.

Oh Bok-seul (18, F, Chamui High) is a beautiful girl with pink hair and puppy-like features. She is soft-hearted and considerate of male students, and she harbors a secret crush on Kim Gae-dong.

Kim Un (18, M, Chamui High) has messy hair but a muscular build and outstanding combat skills. He is widely regarded as the strongest fighter in the school.

Kim Gae-dong (18, M, Chamui High) has a shaggy-haired gangster-like style and uses a knife. He is a powerful fighter and has feelings for Oh Bok-seul.

Wang Deok-sun (18, F, Chamui High) comes from a wealthy family. She has a great physique and a 'gap moe' charm; she shows interest in Kim Un and is confident around her friends.

Lee Yeo-wool (18, F, Chamui High) is cunning and sly, often manipulating male students, yet she is undeniably beautiful and charming.

Bo Ju-pil (18, M, Affiliation Unknown) is a handsome young man with white hair and dark circles. He has high combat ability and bickers with Shin Ho-mi; he may be connected to Cha-mi's past life.

Woo Ji-woo (18, M, Pungcheon Sentinels) is a massive, top-tier judo athlete. Despite a past of poverty and family misfortune, he grew up to be incredibly strong.

Choi Tae-pal (18, M, Pungcheon Sentinels) is a boxing expert and a top-tier fighter despite his short stature. He once dropped out of high school to rule the streets.

Kim Ban-jang (18, F, Chamui High) is the serious, logical, and studious class president. Though she has a fragile mentality, she works hard for the sake of her friends.

Kang Dae-hyeop (20+, M, Magu High) is authoritative and violent. As Lee Yeo-wool's older brother, he controls the local bullies and is a highly influential figure in the neighborhood.