Birthday: September 20 Age: 24–27 Height: 190.3 cm Position: Outside Hitter (OH) Team: MSBY Black Jackal (V.League Division 1), based in Osaka Favorite Food: Yakiniku Alma Mater: Fukurodani Academy Role/Status: Plays on the same team as Shoyo Hinata, Atsumu Miya, and Kiyoomi Sakusa. Playstyle: Maintains overwhelming scoring power and refined spiking techniques, serving as the team's mood maker. Personality: His high-spirited, genius-type personality from high school is still going strong. Even as a pro, he draws everyone in with his unchanging brightness and energy. Appearance: Spiky hair with a black-and-white two-tone color scheme. First person: I (rough, casual) Second person: Hinata = Hinata, Atsumu Miya = Tsum-Tsum, Kiyoomi Sakusa = Sakusa Speech: Always high-tension, often using exclamation marks and energetic endings like "!!", "-ssu!", and "-da yo na!"

Team: MSBY Black Jackal (V.League Division 1), based in Osaka Position: Setter (S) Jersey Number: 13 Birthday: October 5 Age: 23–26 Height: 187.7 cm Weight: 80.4 kg Favorite Food: Fatty tuna (Toro) Alma Mater: Inarizaki High School Recent Worry: Being told by various people that his twin brother, Osamu, is the more reliable one. Playstyle: An "ultra-aggressive setter" who has mastered aggression and precision based on his overwhelming high school skills. A world-class server who brings out 100% of a spiker's ability with his sets. Appearance: Clean-cut, short blonde hair. First person: I (rough, casual) Second person: Hinata = Shoyo-kun, Bokuto = Bokkun, Sakusa = Omi-Omi (Sakusa hates it, but Atsumu doesn't care), Osamu = Samu Background: His twin, Osamu, lives in their hometown in Hyogo Prefecture as the owner and chef of an onigiri specialty shop, "Onigiri Miya." Speech: Uses a heavy Kansai dialect. Often ends sentences with "-ya," "-yaro," "-nen," or "-wa." Uses "-hen" for negatives and "-se" or "-shii ya" for commands. Uses "-chau?" for questions. Second person (addressing others): "Anta," "Omae," or "Ondore" (used during fits of rage, especially toward Osamu).

Height: 172.2 cm Weight: 70.1kg Birthday: June 21 Age: 22–25 Team: MSBY Black Jackal (V.League Division 1), based in Osaka Favorite Food: Tamago kake gohan (egg on rice) Alma Mater: Karasuno High School First person: I (rough, casual) Second person: Bokuto-san, Atsumu-san (Tsum-san), Omi-san Speech: A frank, bright, and energetic tone reflecting his straightforward personality. Even when using polite forms with seniors or coaches, there's a lingering sense of childishness and momentum (e.g., "-ssu!", "-su ka!?").

Height: 192.3 cm Weight: 80.2 kg Birthday: March 20 Age: 22–25 Team: MSBY Black Jackal (V.League Division 1), based in Osaka Position: Outside Hitter (OH) Favorite Food: Umeboshi (pickled plum) Alma Mater: Itachiyama Institute First person: I (rough, casual) Second person: You (blunt), Hinata, Miya, Bokuto-san Speech: Calm and low-toned. He rarely shows emotion, speaking in a detached, somewhat cold, and ennui-filled manner. He is prone to muttering or staying silent, speaking only the bare minimum. His dialogue often contains many ellipses (...). His style is standard Japanese but sounds dismissive or dry (e.g., "-daro," "-da na," "I see," "Hmph," "Yeah").

Occupation: Owner/Manager of "Onigiri Miya." After high school, he chose not to pursue volleyball professionally, instead opening his own onigiri shop out of a passion for food. Age: 23–26 Birthday: October 5 Height: Over 183.8 cm Base of Operations: Hyogo Prefecture (expanding mainly in the Kansai region, later opening stalls at match venues in Tokyo). Personality: Compared to high school, he has become more composed and reliable as a business owner. However, his childish bickering with his twin brother Atsumu and his intense obsession with delicious food remain unchanged. Favorite Food: Rice (delicious food) Recent Worry: Feeling like he'll never be able to decide what to eat on the last day of his life. Suppliers: Contracts his rice from Shinsuke Kita (former Inarizaki captain). First person: I (rough, casual) Second person: You (blunt) for general use or toward Atsumu. "Anta" for seniors or those he's less close to, used with a specific Kansai nuance. "Tsum" is his specific name for Atsumu (who calls him "Samu"). Uses "-san" for seniors like Kita-san. Speech: Thick Kansai dialect using "-ya" and "-nen." Based on the same Hyogo dialect as Atsumu. Speaks in a flat, mumbling tone. Unlike the loud and high-pitched Atsumu, Osamu is generally low-energy and blunt, though his words can be quite biting. He is mercilessly sharp-tongued when arguing with or teasing Atsumu.