Shin Sawada The central figure and leader of Class 3-D. He is intelligent and a strong fighter, earning him respect from those around him. Due to issues in his home environment, he distrusts adults and is generally rebellious toward teachers. While he appears calm and cool on the surface, he is deeply caring and kind toward his friends, hating nothing more than seeing them get hurt.

Haruhiko Uchiyama The class clown and mood maker. Bright and energetic, he plays the role of lightening the atmosphere. Though he seems flighty at first glance, he has strong feelings for his friends and is deeply compassionate. He has the grit to face trouble head-on without running away. He has found his place in the world by hanging out with Shin and the others.

Yoichi Minami The calm and balanced member of the group. He often plays the straight man, reining in his more impulsive friends. While he doesn't show it openly, his trust in his comrades is incredibly strong. He usually acts on logic rather than emotion, but he possesses a hidden passion within.

Takeshi Noda Short-tempered and quick to pick a fight. He is the type to throw a punch immediately, but behind that lies a certain awkwardness. He is fiercely protective of his friends and shows no mercy to enemies, yet he is kind to his inner circle. He is poor at putting his feelings into words and prefers to show his intent through action.

Yamato Ogata A leader-like figure in 3-D. He is a strong fighter, strong-willed, and hates to lose. He has a massive presence in the class and keeps the group together. He has a passionate personality and will do anything for his friends. He is tall and slender with slightly long brown hair. He wears his uniform in a messy, delinquent style. His expression and gaze are sharp, giving him a commanding presence even within 3-D.

Ren Kazama The other leader of 3-D, standing on equal footing with Yamato. He often clashes with Yamato and possesses a cool, composed personality. He rarely shows his emotions but is actually very caring toward his friends. He is a crucial figure in the story of 3-D. He has natural, long black hair with highlights. He is tall and lanky, characterized by his handsome features and calm expression.

Satoru Kuraki A member of Ren's group. Bright and upbeat, he serves as the class mood maker. He is characterized by his regional drawl and is particularly close with Ichimura. He is the type of character who brightens the room even when the atmosphere in 3-D turns sour. His short black hair and cheerful expression are striking. He has a more approachable vibe than the other delinquents, with big smiles and reactions. He plays the role of easing the heavy tension in 3-D.

Kengo Honjo A member of Yamato's group. He is short-tempered and heats up easily, often looking for a fight, but he deeply values his bond with his friends. He is frequently seen acting alongside Yamato and is a prominent figure in 3-D. Though he looks a bit scary, he has a side that moves for the sake of his comrades. He is characterized by his short, light-colored hair and sturdy build. His disheveled uniform gives off the typical '3-D delinquent' vibe. By standing next to Yamato, he reinforces the group's tough image.

Shunsuke Kamiya A member of Yamato's group. He loves girls and has a somewhat flighty, lighthearted personality. In 3-D, he has a playful side, even calling himself the 'mixer captain.' However, he isn't just shallow; he has a strong desire to protect his friends. He is a key member who acts with Yamato and the others. He is tall and thin with somewhat long, brownish hair. With his handsome features, he is particularly flashy even within 3-D. His airy vibe and good looks define his personality. His hair is heavily highlighted.

Rikiya Ichimura A member of Ren's group. He is sensitive to fashion and trends, possessing a relatively smart and sophisticated aura within 3-D. He often hangs out with Ren and Kuraki and is involved in the rivalry between the two groups. He is bright and easy to talk to, valuing his relationships with his friends. He has clean, longish brown hair and a slender build. He wears his uniform relatively neatly, giving off the vibe of a 'fashionable high school boy.' Unlike the ruggedness of Yamato's group, he has a slightly more urban impression.