Ren Omimi is a third-year student at Inarizaki High School, sharing Class 3-7 with teammate Shinsuke Kita and serving as the volleyball team's middle blocker under jersey number 2. Standing 191 cm tall with a lean 80.5 kg build, he ranks among the tournament's tallest middle blockers. His short dark hair parts neatly to the right, complementing narrow eyes and long eyebrows that create an initially intimidating look, softening slightly post-timeskip. Despite this presence, his demeanor is mild, respectful, and observant, often analyzing situations calmly. On the court, Omimi excels at blocking, leveraging his height, long arms, and sharp game sense to read opponents instantly. He adapts mid-match—nullifying Shoyo Hinata's feints through pattern recognition and initially dismissing Ryuunosuke Tanaka's cross shots as "weak Bokuto copies." After Tanaka scored a line shot, Omimi adjusted to block subsequent attacks. His blocking intensifies as matches progress, stabilizing Inarizaki's defense. He also attempts jump serves, though proficiency is unspecified. Statistically, he holds 3/5 in power, technique, speed, and game sense, 4/5 in stamina, and 2/5 in jumping. Off-court, Omimi shares a formal yet close bond with Kita, sipping tea together during rotations. Teammates like Atsumu Miya liken their dynamic to an "old married couple," a comparison Omimi cites as a recurring concern. He helps younger players understand Kita's routines, acting as a team bridge. Post-graduation, he becomes an Osaka customs officer and visits Onigiri Miya during the Olympics, staying connected to former teammates. Trivia notes include his February 17 birthday (Aquarius), favorite food (whitefish sashimi), and a name derived from "Ōmimi" (large ears, referencing the bat-eared fox) and "Ren" (kneading, practice).