Yuuji Kousaka serves as the younger brother to Tamaki Kousaka and a classmate of the series' protagonist, Takaaki Kouno. He consistently embodies the role of the "perverted friend" throughout all official media, demonstrating a strong preoccupation with female characters. This manifests primarily through his photography hobby, which obsessively focuses on capturing images of girls. His behavior frequently triggers comedic retribution, most often delivered by his older sister Tamaki via her signature painful forehead-crushing technique, known as her "iron claw". His personality blends carefree and outgoing traits with palpable envy, chiefly directed at Takaaki Kouno. Yuuji perceives Takaaki as garnering excessive attention from female classmates, fueling his jealousy which stems from his own romantic frustrations. This envy actively contributes to his recurring comedic misfortunes. Despite hailing from a wealthy family, Yuuji maintains a frivolous demeanor, channeling his energy into pursuits involving female subjects, whether romantic or photographic. Physically, Yuuji is portrayed as a slim teenager with pale skin. His distinctive features include short red hair featuring spiky bangs and brown "tareme" eyes (characterized by a drooping shape). His typical wardrobe consists of standard school uniforms like the gakuran, along with casual hoodies and trousers. His core role remains firmly established across sequels and spin-offs, including To Heart 2 AnotherDays, where he functions as a side character. His narrative presence reinforces his established traits and dynamic with Takaaki without significant development. This consistency extends through the broader series chronology encompassing OVAs like To Heart 2 AD, To Heart 2 AD Plus, and To Heart 2 Adnext. Yuuji maintains his supporting function, primarily providing comedic interactions rooted in his envy, romantic misadventures, and repeated confrontations with Tamaki.