Ozeki Shinya (大関 信也 Ozeki Shinya) is a third year student at Oodachi High School, as well as the captain of its sumo club.
He is a sumo fanatic, to the point that he would meticulously build a ring in the school yard after the dojo is taken over by delinquints. But, as the only
member of the sumo club before Hinomaru joined him, he is extremely timid, and scared of confronting bullies as he is often outnumbered. This also reflects his preference to fight in team competitions rather than individual battles.
Due to his great fundamentals, he has strong loins and legs. However, he loses often to Hinomaru due to his high center of gravity, making Hinomaru easy to throw him down. But against Sanada, who proactively fought off delinquents, Ozeki's defensive mindset helped him outlast Sanada, hitting the ground a split-second after Sanada. His endurance is often underestimated.
District Preliminary arc
Sumo Recruitment arc
His blood type is O.
His name, Ozeki, is also a rank in below Yokozuna. Whether he actually became one remains to be seen.
His hobbies include keeping tropical fish as pets, eating desserts and building scale models, especially castles.
Despite him being the only person weighing over 100kg at the beginning of the anime, he's a remarkably light eater. He can barely finish a large bowl of rice at buffet. However, when the team is ordered to eat to gain weight under Tsuji's orders, he still obliged. Instead, he prefers desserts.