Ōji is a young man of average build with light brown, medium length hair parted in the middle, flipping out at the ends. He has blue eyes with most often visible eyelashes.
Ōji is a perceptive and scheming individual. He also has a habit of giving others weird nicknames. He acts in a princely manner, appearing to be a purposeful reference to his surname, as he was the one to request Kittaka to make the icons he uses in his explanations, which depict him as a handsome guy with a prince's crown.
According to Ashihara, he must be an idiot if he portrays himself as such.
(To Osamu) "You think that you can win because I can only use one hand against you? It's not that I look down upon you, but you're not as strong as you might think. '
(As a commentator for Round 8) "Looks like... a stalemate for the time being. I wish I'd brought something to drink. "
(Thoughts during Round 8) "So close, Ossamu. If only you'd gone for more of a spreadshot. If only you had more experience as a shooter... "