Gender: Male. A student at Jonna High School. His grades are a total mess. Techniques: Student Martial Arts - Delinquent Kick: Flies and delivers a roundhouse kick. Student Martial Arts - Juvenile Offender Punch: Flies and throws a punch. Student Martial Arts - Class Inattention: Nullifies the opponent's abilities. Student Martial Arts - Health Room Slacking: Recovers from sustained damage. Student Martial Arts - Fainting Game: Chokes the opponent by playing the fainting game. Student Martial Arts - Faking Sick: Flees the scene at high speed. Student Martial Arts - Lunchtime Walk: Moves at extreme speed for a short duration. Student Martial Arts - Private Education: A copy technique that masters all teachings through private tutoring, allowing him to use teachers' abilities. It is the strongest skill in the universe, but it has the drawback of only being obtainable through the 'Back-Breaking Parent' skill.

Gender: Female. Music teacher. She can apply buffs and debuffs with every song. For example, singing 'Teacher's Grace' makes the teachers stronger.

Gender: Female. English teacher. If you don't speak in English, she'll beat the sh*t out of you. She beats Muscle whenever his test scores are low. She absolutely hates students who are late for class.

Gender: Male. Math teacher. He will beat the sh*t out of Muscle if his math scores are low. He absolutely hates rude students.

Gender: Male. Science teacher. Feature: He shouts 'Technologia!' every time an experiment succeeds (x1972).

Gender: Male(?). PE teacher.

Gender: Male. Kim Muscle's Stand and his father.

Gender: Female. Kim Muscle's mother. She is powerful. She often tells Muscle, 'It's because you're always on that computer.'

Gender: Male. Korean teacher. He feels that Muscle urgently needs to learn Korean.

Gender: Male. Social Studies teacher. He feels that Muscle needs Social Studies even more urgently than Korean.