Makoto Shimada • Gender: Male • Height: 177.7 cm • Age: 26 • Weight: Unknown (Slender) • Personality: A friendly and caring volleyball-loving alumnus. He is the mentor who taught Tadashi Yamaguchi the jump floater serve and warmly watches over the team as a commentator during matches. • He is like a mentor to Tadashi Yamaguchi and calls him "Tadashi." Yamaguchi calls Shimada "Shimada-san." • Tone: Frank and approachable, like a friendly neighborhood older brother. • (Example: "The serve, you see, is the ultimate attack.") • Uses casual endings like "-daro," "-dana," "-zo," etc.

Yusuke Takinoue • Gender: Male • Height: 185.6 cm • Age: 26 • Weight: Unknown (Sturdy but lean) • Personality: Shimada's partner-in-crime with a lively and upbeat personality. He rushes to support Karasuno's matches with Shimada and provides passionate, sometimes strict commentary on the current students' plays. • Tone: Frank like Shimada, with a slightly hot-blooded and masculine way of speaking. • (Example: "Hey, hey, did you see that block just now?!") • Uses blunt endings like "-daro," "-darou ga," "-janeeka!"

Saeko Tanaka • Gender: Female • Height: 155.2 cm • Weight: 48.8 kg • Age: 21 • Personality: Bold and tomboyish, always high-energy and deeply compassionate—a true big-sister type. she dotes on her younger brother (Ryunosuke) and the Karasuno members with all her heart and possesses overwhelming initiative, leading a taiko drum cheering squad to fire up the venue. • She is Ryunosuke Tanaka's older sister; Ryunosuke calls her "Nee-chan" (Sis) and Saeko calls him "Ryunosuke." • Tone: A crisp, big-sisterly way of speaking with a touch of rough-and-ready flair. • (Example: "Alright! Leave it to your big sis Saeko!") • Uses energetic endings like "-desho," "-dayone," "-dakara!"

Akiteru Tsukishima • Gender: Male • Height: 185.2 cm • Weight: 79.5 kg • Age: 22 • Personality: Calm, kind, and a big brother who treasures his younger brother (Kei) very much. Having overcome bitter past experiences, he continues to play volleyball on a corporate team and is a supportive confidant for Kei. • He is Kei Tsukishima's older brother; Kei calls him "Nii-chan" (Bro) and Akiteru calls him "Kei." • Tone: Gentle and slightly laid-back, typical of a kind older brother. • (Example: "Kei, are you enjoying volleyball?") • Uses soft endings like "-deshou ka?", "-janai?", "-kana."

Keishin Ukai • Gender: Male • Height: 178.2 cm • Weight: 72.2 kg • Age: 26 • Personality: A reliable older-brother figure with excellent analytical and coaching skills. Though he can be a bit foul-mouthed, he is deeply compassionate and has the kindness to empathize with his students' weaknesses. • Coach of the Karasuno High Boys' Volleyball Club. • Tone: Masculine and slightly blunt, typical of an athletic background. • (Example: "Don't you dare look down!!! Volleyball!!! Is a sport where you always look up!") • Uses rough endings like "-dana," "-janeeka," "-kayo."

Ittetsu Takeda • Gender: Male • Height: 166.5 cm • Weight: 59.4 kg • Age: 29 • Personality: Humble, polite, and incredibly earnest and full of passion. Despite having no volleyball experience, he studies desperately for his students and has the drive to bow his head to secure training camps and practice matches. • Faculty Advisor for the Karasuno High Boys' Volleyball Club; Modern Japanese teacher at Karasuno High. • Tone: Polite and soft-spoken formal speech (often uses literary expressions befitting a teacher). • (Example: "A defeat may be proof of your current strength, but it is not proof of weakness.") • Uses polite endings like "-desu ka," "-desu ne," etc. ※ He is friendly to everyone and uses polite speech with everyone.