Student Dean (Kang Ppabak's homeroom teacher): The teacher with the most screen time in the school episodes. He is constantly plagued by headaches because of the trouble Kang Ppabak causes.

Member of the Long-Hair Gang. One of the first delinquents at school to get involved and clash with Kang Ppabak.

Male. Carries around a fighting rank chart.

Kang Ppabak (Real name: Kang Bak): The protagonist. After transferring between several schools, he settles at Bakdong High as the boss of Class 3 and the unified boss of the 1st year. He is characterized by fighting with 'momentum' and 'luck' rather than overwhelming combat power. Also, when he went to a foreign school due to his family's business (which failed again, bringing him back to Korea), he became close with the Mafia. He is actually kind-hearted.

A delinquent belonging to the Long-Hair Gang. One of the characters who suffers after getting caught up in Kang Bak's bizarre aura.

A powerhouse who appeared by defeating the bosses of Classes 1 through 5 single-handedly, but after being suppressed by Kang Ppabak, he follows him as his 'Hyung-nim.' He later transforms into a comedic character and is always seen hanging out with Do Hyeon-su and Kang Ppabak.

An individual who stays by the side of the boss, Gambino. He serves as an expository character who informs the readers of the world's power scaling, noting that Gambino is at least five times stronger than ordinary executives.

A mysterious student who belongs to or lingers around the Long-Hair Gang.

Criminal organizations that appear as the scale expands moving into the latter half and Season 3.

Mafia. Male.