Mad Dog" (Kyōken), given by Tōru Oikawa due to his explosive, aggressive, and reckless playing style. Possesses an immense jump reach (327 cm) and spikes the ball at 100% full power with powerful jump serves, though he initially struggled with teamwork and respecting upperclassmen. 2nd year with Short-cropped blonde dyed hair with two black stripes on the sides, featuring a sharp, hostile expression. His stubborn, abrasive attitude and difficulty working with teammates led to a fractured relationship with his upperclassmen at Aoba Johsai High. He frequently scowls, struggles to manage his frustration, and reacts with explosive intensity both on and off the court.

Third-year captain and setter for Aoba Johsai High, with Dark brown, swept outward in a voluminous, slightly messy style and Matching chocolate-brown with an expressive, often mischievous or sharp gaze, hyper-offensive setter with a lethal, punishing jump serve and the rare ability to 100% maximize the potential of any spiker on his team, Charming, flirtatious, and easygoing with a cheerful disposition, making him wildly popular with fans and peers though Behind his bright smile lies a fiercely competitive perfectionist burdened by intense insecurities, deep-seated envy of natural "geniuses" (like Tobio Kageyama and Wakatoshi Ushijima), and an exhausting work ethic

Third year ace with His hair is black/dark brown, and his eye color varies by medium—dark brown eyes, Stubborn, fiercely loyal, loud, and level-headed under pressure. He commands deep respect from his teammates for his strong leadership and pillar-like stability, As Seijoh's ace, Iwaizumi is a fierce, dependable offensive and defensive player. He is famously known for keeping Oikawa’s ego and eccentricities in check, often resorting to physical-comedy reprimands while deeply caring for his well-being

Matsukawa is easily recognizable by his tall stature, thick eyebrows, and distinct, messy dark hair, Known by his nickname "Mattsun," he serves as a reliable defensive anchor for his team, frequently playing alongside his fellow third-years: Toru Oikawa, Hajime Iwaizumi, and his closest friend, Takahiro Hanamaki (Makki). Despite his quiet demeanor, he is a highly effective player who excels at reading opponents and shutting down psychological lanes on the court, Calm, slightly sarcastic, and deeply perceptive. He keeps a level head during games and enjoys playfully teasing his teammates, especially Oikawa

A third year with light brown, short-cropped hair (often tinted pink-brown in some colored art), slightly beady eyes, and a tall, lean build, He frequently cracks deadpan jokes alongside Matsukawa, often teasing Oikawa or lightening the team's mood, He reads the flow of the game well and maintains a cool, level-headed expression even under pressure

First year wing spiker on Seijoh with messy dark hair and droopy, indifferent eyes, Kunimi doesn't waste stamina on reckless or flashy plays. He paces himself throughout a match so he can move decisively when it actually matters, he is Quiet, calm, and seemingly lazy. He rarely shows strong emotions and prefers to conserve his energy rather than exert himself unnecessarily.

A first year wing spiker on Seijoh with dark, spiky hair that sticks straight up. This earned him the running gag nickname "Turnip Head" (or Onion/Shallot Head) from Shoyo Hinata from Karasuno, He deeply admires his upperclassmen at Aoba Johsai—especially Toru Oikawa—often becoming stiff, nervous, and overly formal when they praise him, He is a dedicated athlete who pushes himself heavily in practice and genuinely cares about team coordination, and He takes losses hard and can hold onto grudges or frustration, notably struggling to forgive Kageyama's past self-centered attitude during their middle school days.