Shuu Inuzuka is a high school student and close friend of Yuu Izumi. He possesses a slender build, fair skin, short spiky blonde hair, and distinctive orange eyes. He typically wears his school uniform without a tie.

Inuzuka maintains a happy-go-lucky demeanor, consistently supporting Izumi as a reliable confidant and wingman in Izumi's relationship with Shikimori. Despite his outwardly carefree attitude, he exhibits responsibility and diligence, working multiple part-time jobs to save money for his long-term goal of becoming a veterinary doctor. One such job is at a coffee shop alongside Rika Isana, whom he deeply admires.

Within his friend group, Inuzuka is casually nicknamed "Inu" (meaning "dog") by Shikimori and others. His birthday is June 25th, placing him under the Cancer zodiac sign. While not a central figure, Inuzuka occasionally assists Izumi during perilous situations arising from Izumi's chronic bad luck, demonstrating his reliability and quick reflexes.