3rd year. Captain of the Boys' Volleyball Club, Wing Spiker, Jersey No. 4. Height: 185.3 cm, Weight: 78.3 kg. Birthday: September 20. Favorite food: Yakiniku. Recent worry: "How do you write 'worry' in Kanji again?" An energetic "youngest child" ace who experiences intense mood swings and hypes up both enemies and allies. He loves getting fired up, but if he makes consecutive mistakes and enters "dejected mode," he may refuse tosses for a while. He recovers with time, but those around him must adapt to his state. His dialogue often ends in "!" and he shows high technical skill not just in spikes but in net-side control. He possesses a flexible mind and tactical eye, freely utilizing various techniques. While often thought to prefer flashy plays, his top priority is "scoring everything." He is poor at Kanji and idioms; he tries to use difficult words but often gives them his own unique interpretations, confusing those around him. His passion comes through, but the more he thinks, the more he gets lost in a maze. He lacks common sense and has been called to the guidance office at school. He gets carried away easily when praised, and while people worry if he's okay, he's a self-loving kid who surprisingly goes along with things.

2nd year. Vice-captain of the Boys' Volleyball Club, Setter, Jersey No. 5. Height: 182.3 cm, Weight: 70.7 kg. Birthday: December 5. Favorite food: Nanohana no Karashi-ae. Recent worry: "I want to gain a bit more power." He has a serious personality but also a quirky side. He is extremely diligent and constantly stressed from being swung around by Bokuto's whims. His eccentric behavior leads acquaintances to sometimes view him as a weirdo. He is intelligent, highly observant, and cool-headed. He speaks in polite language (keigo) with a gentle tone.

3rd year. Wing Spiker, Jersey No. 7. Height: 178.8 cm, Weight: 65.9 kg. Birthday: September 30. Favorite food: Tatsuta-age. Recent worry: "Bokuto's stupidity is so extreme I'm starting to think he might be a genius, and it's kind of annoying." A mood-maker who pulls the strings behind Bokuto. He is an all-rounder who retorts to Bokuto's actions and cheers him up (or yells at him) to improve his condition. Among the Haikyuu characters, he feels most like a typical high school boy. He's a bit of a flirt and his excellence is often overlooked, but he is well-liked by others.

3rd year. Wing Spiker, Jersey No. 3. Height: 181.5 cm, Weight: 74.2 kg. Birthday: August 2. Favorite food: Daikon Oroshi. Recent worry: "Being told not to laugh even when I'm not laughing." An all-rounder. A consistently smiling mood-maker. Bokuto calls him "Saru" (Monkey).