Kyouya Mitsurugi

A boy with a strong sense of justice who is also from Japan.

[Spoiler] Being a reincarnator, Mitsurugi has enhanced statistics and a cheat item in the form of the Cursed Sword Gram granted to him by Aqua. Like the others (barring Kazuma), he is extremely powerful, capable of taking down extremely powerful foes such as an Ancient Dragon in a single hit, or rip open metal bars with his hands.

(Source: Konosuba Wikia, edited) [/Spoiler]