Quirk: Steel (スティール Sutīru?): Tetsutetsu's Quirk allows him to turn his skin into steel. This power grants Tetsutetsu both augmented defensive abilities to withstand attacks, as well as the augmented strength of his unarmed physical attacks. Upon losing an arm-wrestling match, he mentioned that he should have had more iron that morning, implying that his Quirk's strength is fueled and affected by his diet containing iron.