This list will be updated as the story progresses. All information is spoiler-free.)
MAIN CHARACTER
Kazuki Hayama
School: Minamiyama High School
Year: First-Year (Canon begins during his Second Year)
Position: Wing Spiker / Situational Setter
Height: 181 cm
Playstyle: Fast tempo, high adaptability, sharp court awareness
Strengths: Reading the flow of play, precision control, stamina growth
Weaknesses: Inexperience, incomplete fundamentals, emotional restraint
Notes: Kazuki possesses the Complete Volleyball System, a reality-based growth system that reflects physical condition, technique, and match experience rather than instant mastery.
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MINAMIYAMA HIGH SCHOOL
Ren Takahashi
Year: Second-Year
Position: Setter
Role: Starting setter
Traits: Disciplined, cautious, traditional playmaker
Notes: Initially views Kazuki as an unpredictable variable but gradually recognizes his influence on the team's rhythm.
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Ryuusei Mori
Year: First-Year
Position: Wing Spiker
Traits: Explosive, emotional, competitive
Notes: Develops a rivalry with Kazuki, pushing himself harder whenever they share the court.
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Daichi Kanzaki
Year: Third-Year
Position: Middle Blocker
Role: Defensive anchor
Traits: Reliable, observant, physically imposing
Notes: One of the first seniors to notice how Kazuki raises the team's baseline performance.
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Haruto Shinomiya
Year: Third-Year
Position: Libero
Role: Team captain
Traits: Calm, vocal leader, defensive specialist
Notes: Acts as the emotional and strategic anchor of Minamiyama High.
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Coach Aoyama
Role: Head Coach – Minamiyama High
Coaching Philosophy: Fundamentals first, long-term development over quick results
Notes: Allows the players to discover Kazuki's value organically rather than forcing roles.
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RIVAL & OBSERVED SCHOOLS (NON-CANON OCs)
Keita Mizuno
School: Aobayama Technical
Year: Second-Year
Position: Opposite
Traits: Power-focused offense
Notes: First opposing ace to struggle with Kazuki's pace.
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Souta Hayami
School: Seiryuu High
Year: First-Year
Position: Setter
Traits: Talented but inconsistent
Notes: Represents the standard expectations placed on first-year setters.
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CANON CHARACTERS (HAIKYUU!!)
(Timeline accurate to canon. Appearances align with Kazuki's development.)
Kageyama Tobio
School: Kitagawa Daiichi (Middle School) → Karasuno High
Year (Current): Final Year Middle School → First-Year High School
Position: Setter
Notes: Will enter the story during Kazuki's Second Year as canon begins.
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Miya Atsumu
School: Inarizaki High
Year: Second-Year
Position: Setter
Notes: Member of the All-Japan Youth Camp.
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Ushijima Wakatoshi
School: Shiratorizawa Academy
Year: Third-Year
Position: Opposite Hitter
Notes: One of the nation's strongest aces.
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Bokuto Koutarou
School: Fukurodani Academy
Year: Third-Year
Position: Wing Spiker
Notes: Nationally recognized ace.
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Hoshiumi Kourai
School: Kamomedai High
Year: Second-Year
Position: Wing Spiker
Notes: Known for athleticism and relentless playstyle.