Sō Inuoka enters Nekoma High as a first-year volleyball player, initially positioned as a middle blocker. He stands among the team's tallest members with a lean build, short spiked brown hair, and brown eyes; his appearance changes little post-timeskip, though his hair shortens further. Hinata nicknames him "Lanky" upon their first meeting due to his height. Inuoka possesses a bright, energetic personality brimming with positivity and enthusiasm, reminiscent of Hinata's. While not a quick thinker—as observed by Coach Naoi and Kenma—he approaches volleyball with serious passion, especially in blocking. Supportive and hardworking, he harbors no grudges; when Lev replaces him as starter, he channels this into motivation rather than resentment. His favorite food is fried chicken with rice, and his birthday falls on November 1 (the Japanese "Day of the Dog"). During a practice match against Karasuno, Kenma tasks the agile Inuoka with marking Hinata. He becomes the first player to block Hinata and Kageyama's quick set, demonstrating his speed and adaptability. This match sparks a rivalry and mutual respect between Inuoka and Hinata, each acknowledging the other's skill. Coach Nekomata notes Inuoka excels when given clear, focused tasks despite his tendency to overthink during games. After Lev joins Nekoma, relegating Inuoka to a supporting role, he remains determined to contribute. Coach Nekomata later proposes a position change to wing spiker during Golden Week to utilize his height for blocking, leading to sporadic match appearances. Subbed in during the Nationals match against Karasuno to help Lev contain Hinata, he successfully blocks Hinata once but later falters when Hinata exploits gaps in his block. Despite setbacks, he shows improved defensive skills, such as cleanly receiving Tanaka's serve to set up a scoring chance for Lev. Inuoka frequently supports fellow first-years Shibayama and Lev emotionally during matches. He actively participates in team activities like training camps and post-camp barbecues, noted for consuming large amounts of food. After Nekoma's Nationals loss to Karasuno, he is seen crying but receives comfort from teammates. Post-graduation, Inuoka pursues a career as a childcare professional, confirmed in 2021. He maintains connections with former teammates, expressing interest in visiting Russia during a gathering at Kenma's home. His volleyball statistics emphasize physical prowess: power (4/5), stamina (5/5), and speed (5/5), contrasted with lower game sense (1/5) and technique (1/5), reflecting his reliance on athleticism over tactical skill.