|Name (Kanji)||坂本 雄二|
|Name (Romaji)||Sakamoto Yūji|
|Title||Class 2-F Representative|
|Family||Yukino Sakamoto (Mother)|
|Voice Actor||Scott Freeman|
|Anime||Season 1 Episode 1|
Yuuji Sakamoto (坂本 雄二 Sakamoto Yuuji?) is a red-haired boy and the class representative of class F. In the series, the class rep position is assigned to the smartest student of that class. He is cool, collected, and exhibit surprisingly high intelligence and foresight unexpected of a student from class F. In volume 1, his strategies and tactics helped class F to attain victory after victory, until the duels with class A in which he overestimated his ability in elementary school-level Japanese history. Yūji was once known as a child prodigy in his childhood. The only reason why he ended up in class F was because he did not study at all and he holds the strong belief that grades are not everything. However, due to the consequences he 'suffered' from his defeat from Shōko Kirishima, his childhood friend and also the top student of his level, he became motivated to study again. In the later volumes, his Shōkanjū became reasonably strong in just a few months due to his test scores improving by leaps and bounds. It is implied that he is actually smarter than his childhood friend, Shōko.
After the tournament in volume 2, he acquires a platinum bracelet which allows him to control the size of the force field of his Shōkanjū, allowing him to form a one-man army choke point since humans cannot pass through this force field. He bears no ill intention towards Shōko, but due to her unyielding obsession with marrying him since their childhood days, he sees her as having a few loose screws in her mind, and fears to even think of his future if he does marry her. In the anime, its suggested that they act like a married couple though she tends to treat him as a slave in order for him not to escape her. Despite this, he does actually think well of Shōko and it is implied to have feelings for her himself, although he denies this. Yūji is close to Akihisa to the point where they can actually communicate without any words. A gag in the series is that Yūji will attempt to decipher a complicated expression on Akihisa and comment on a series of events that must have taken place. While he meant it as a joke, he is always a spot-on when this happens. His Shōkanjū wears a long trench coat that makes it look like a punk, and is armed with brass knuckles. During the ESB field error, his shōkanjū becomes a handsome adult version of himself wearing a school uniform, much to Shōko's delight.