Satou Kazuma is the main protagonist of the KonoSuba series.

Prior to his new life in the Fantasy World, Kazuma was a hikikomori, isolating himself from society and spending all his time in his room playing video games, maintaining few to no relationships. Some of these traits would manifest from time to time in the Fantasy World, such as becoming extremely nervous when first meeting the beautiful Darkness and resigning himself to lazing around under his kotatsu at all times.