Cinque Izumi
A 13-year-old half-Japanese, half-British kid who gets yanked into the fantasy world of Flonyado and becomes Princess Millhiore's official "Warrior" for the Kingdom of Biscotti Republic. He's pretty much the cheerful, easygoing type—the kind of guy who does things at his own pace without overthinking it.
Before the summoning, Cinque was just a first-year middle schooler at an international school in Japan, so the whole interdimensional warrior thing is definitely a step up from his previous life. He's naturally athletic and loves sports, with the kind of acrobatic skills that come in handy when you're swinging a magic sword around.
Speaking of which, he wields Palladion, the Divine Sword of Biscotti. The weapon's pretty cool in that it shape-shifts based on who's holding it—in Cinque's case, it transforms into a staff. He can also blast destructive energy beams out of the thing, which tends to be useful in a fight. Fans often note that he seems to have romantic feelings for Millhiore, though he's not exactly suave about it.
Content compiled by AnimeList.moe from publicly available sources.