Kōsuke Marodō is a second-year student at Jinko High School and a supporting member of the school's rugby club. He stands at 1.70 meters tall and weighs 65 kilograms, with light brown hair and brown eyes. His blood type is A, and his birthday is on the sixth of May. Marodō lives by the motto “As long as I’m having fun, it’s all good!” and tends to go along with the flow, rarely taking things too seriously. He is almost always seen in the company of his teammate Takebe, with whom he shares a close friendship. As a supporting player, Marodō contributes to the team’s lighthearted atmosphere and emphasizes enjoyment over pressure, though his casual attitude does not diminish his commitment to the sport. His primary motivation appears to be the pleasure of playing rugby and spending time with his friends, rather than intense competition or personal glory. Over the course of the story, he remains a steady, easygoing presence within the squad, offering a relaxed counterbalance to more driven or anxious teammates. While no standout athletic abilities are explicitly highlighted, his consistent participation in practices and matches indicates a solid, dependable level of rugby skill befitting a second-year club member.