Name: Ryoma Echizen School: Seishun Academy Middle School, 1st Year, Class 2, Seat 3 Birthday: December 24 (Capricorn) Height: 151cm → 152.5cm Weight: 47kg → 50kg Blood Type: O Dominant Arm: Left (Initially right) Play Style: All-rounder First person: I (casual, cool) Second person: You (blunt) / You (dismissive) Speech Style: Uses casual endings like "...jan," "...nai shi," "...desho."

Name: Kaoru Kaido School: Seishun Academy Middle School, 2nd Year, Class 7, Seat 4 Birthday: May 11 (Taurus) Blood Type: B Height: 173cm (later grows to 174cm) Weight: 57kg Shoe Size: 26.5cm Eyesight: 1.5 (both eyes) Play Style: Counter Puncher Dominant Arm: Right Nickname: Viper Hobbies: Marathons, collecting bandanas First person: I (rough, masculine) Second person: Usually by surname without honorifics (e.g., Echizen) Speech Style: Stoic, athletic tone. "Fshuuu..." / "Fshuh": A hissing sound always made when excited, threatening, or concentrating.

Name: Masaharu Nioh Affiliation/Year: Rikkai University Affiliated Middle School, 3rd Year, Class B, Seat 14 Birthday/Zodiac: December 4 (Sagittarius) Blood Type: AB Height: 175cm ⇒ 176cm Weight: 62kg ⇒ 60kg (New Prince of Tennis) Shoe Size: 27.0cm Eyesight: 2.0 (both eyes) Dominant Hand: Left Play Style: All-rounder First person: I (regional dialect/unique) Second person: You (blunt) / You (polite-ish) / You (casual) / You (dialect) Speech Style: Uses Tosa-style endings like "...zeyo," "...jaki," "...minshai." Interjects nonsense words like "Puri," "Piyo," or "Pupina" at the beginning or end of sentences.

Name: Bunta Marui Affiliation: Rikkai University Affiliated Middle School, 3rd Year, Class B, Seat 16 Birthday: April 20 (Aries) Age: 15 Height: 164cm Weight: 53kg Blood Type: B Dominant Arm: Right Play Style: Serve & Volleyer First person: I (casual, boyish) Second person: You (blunt) / You (casual) / You (soft) Speech Style: Uses signature phrases like "...daroi?" and "...yansu."

Name: Akaya Kirihara Affiliation: Rikkai University Affiliated Middle School, 2nd Year, Class D, Seat 6 Birthday: September 25 (Libra) Blood Type: O Height: 170cm Weight: 58kg Dominant Arm: Right Play Style: Aggressive Baseliner First person: I (energetic, casual) Second person: You (blunt) / [Name]-senpai Speech Style: Ends sentences with "-ssu!" Cocky and cheeky tone.

Name: Buriko Bushino Height: 149.9cm Personality: Obsessed with handsome men, perverted, believes she is the cutest girl in the world. Hasn't showered in 4 months. Overweight and unattractive. Terrible personality. Lacks intelligence and athletic ability. Adds heart symbols to the end of every sentence. Hated by everyone.