Satou Kazuma is the main protagonist of the Konosuba: God's Blessing on this Wonderful World! light novel series, as well as its manga and anime adaptions. Kazuma is voiced by Fukushima Jun in the Japanese Dub of the anime and Arnie Pantoja in the English Dub.
Satou Kazuma was originally a student from Japan who always skipped out on school in favor of lazing around at home playing video games. Eventually he died in an accident and was sent to the fantasy world alongside the Goddess of Water Aqua in order to defeat the Demon King, who sought to oppress the free peoples of the fantasy world.
Although he is physically weak, Kazuma quickly made a name for himself as a competent tactician who defeated many generals of the Demon King's army alongside his party, even befriending Iris, the First Princess of the nation in which Kazuma now lived.
Kazuma's party consisted of Darkness, a masochistic crusader; Megumin, a powerful wizard with a dramatic flare; and the previously mentioned Aqua.
Kazuma eventually fell in love with his fellow party member Megumin, and the two have since entered a relationship, much to the chagrin of Darkness and Princess Iris, who also harbor feelings for him.
He also has the Ability to use "Steal", a skill which was first used on Chris, accidentally stealing her panties in the process, ironically Chris was the one who taught it to him. He tried to use it on Aqua, but it backfired since it failed to work on her, he accidentally end up stealing Megumin's panties by mistake.