Masaru Ebumi is a second-year winger for the Kanagawa High School Rugby Club in the anime All Out!!. He began playing rugby only after starting high school, having been invited to join the club by his teammate Mutsumi Hachiouji. Ebumi is of average height but possesses a muscular build, with his notably powerful thighs being a distinctive physical trait. His personality is defined by intense aggression that often borders on violence, combined with an explosive temper and a deep-seated dislike of losing. Rugby is the first activity he has ever felt genuinely passionate about, and he channels all of his energy and determination into the sport. He cannot tolerate teammates who approach the game with a lukewarm attitude, which sometimes leads to conflict during practice. Despite his rough exterior, Ebumi is fiercely dedicated and always gives his utmost effort in everything he cares about. Within the team, he serves as a passionate and sometimes volatile presence, pushing others through his sheer intensity. His key relationship within the club is with Hachiouji, who first brought him into the sport, and his bond with the team helps him direct his aggressive tendencies toward constructive teamwork. Over the course of the story, Ebumi learns to harness his passion more productively, developing from a hot-tempered newcomer into a reliable and hardworking member of the squad. His abilities on the field are anchored by his powerful lower body, which contributes to his explosive speed and tackling strength, making him a valuable asset as a winger.