Hisashi Kinoshita is a second-year student at Karasuno High School and a member of the boys' volleyball team. Initially a wing spiker, he develops into a specialized pinch server. He stands between 174.7 cm and 175.8 cm tall, weighs 65.5 kg, possesses short, spiky light brown hair, gray or brown eyes, and an average build. Post-timeskip, his appearance changes minimally with slightly longer hair, and he later works for a train company. Kinoshita joined the volleyball club during its more recreational phase as a first-year. When former coach Ikkei Ukai returned and intensified training, he, Chikara Ennoshita, and Kazuhito Narita struggled to adapt and temporarily quit. Regretting their decision after realizing their attachment to volleyball, they returned only to find Ukai had departed due to health issues. This led them to dub themselves the "Ungrateful Second-Years." Kind yet reserved, Kinoshita often feels anxious about his abilities despite an uncanny knack for scoring points. He actively supports teammates, cheering loudly during matches and assisting peers with studying off-court. His calm demeanor includes subtle humor, like teasing Ryūnosuke Tanaka or drawing on sleeping teammates. However, self-doubt about his role frequently surfaces. His development focuses intensely on refining a jump float serve before the Spring High Nationals. This relentless practice pressures fellow pinch server Tadashi Yamaguchi and earns Kinoshita critical match opportunities. During a practice match against Date Tech, he scores a service ace but later faults, prompting Coach Keishin Ukai to warn him against hiding during substitutions. His serves also become vital training tools for libero Yū Nishinoya, who struggles to receive float serves. In official tournaments, Kinoshita serves as a pinch server against teams like Tsubakihara, Inarizaki, and Kamomedai. Facing Inarizaki, he feels overshadowed as other second-years shine, lamenting, "I didn’t do anything." Yet, he aids Nishinoya by guiding his positioning against Atsumu Miya’s float serves, contributing to the libero’s breakthrough. Post-graduation, he attends Karasuno alumni gatherings, including professional matches featuring former teammates. Kinoshita shares a close bond with fellow "Ungrateful Second-Years" Narita and Ennoshita. He also interacts with Tanaka and Nishinoya during study sessions and training camps, offering encouragement and light jokes. His favorite food is pickled ginger.