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Klaus was a man of average height and build, with short blond hair. When not wearing the standard Survey Corps uniform, his attire consisted of a button-up shirt and dark pants.
Klaus participates in the Survey Corps' mission to retake Wall Maria, and after the emergence of the Beast Titan and his forces, Klaus' team is ordered by Erwin to regroup with Squads Marlene and Dirk to guard the Corps' horses. He and his fellow soldiers fight off nearby Titans to protect the recruits in Dirk's team while they move the Corps' horses to a safe place. During the fighting, however, Klaus and his fellow soldiers are killed by the Beast Titan, who starts throwing crushed boulders at them, cutting them all to pieces.