Steel: Tetsutetsu's Quirk allows him to turn his skin into steel. This power grants Tetsutetsu both augmented defensive abilities to withstand attacks and the increased strength of his unarmed physical attacks. Upon losing an arm-wrestling match, Tetsutetsu 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. If he uses his Quirk for too long, Tetsutetsu will suffer from iron fatigue, resulting in his metal form losing its durability. And while his steel skin has a heat resistance, it will melt if the temperatures are high enough. In addition, due to his skin transforming into metal, Tetsutetsu is susceptible to magnetism. While highly durable, Tetsutetsu has also mentioned that Steel has a set limit of hardness that cannot be improved upon, unlike Eijiro's Hardening.
Enhanced Durability: Tetsutetsu has enhanced durability thanks to his Quirk. His steel skin allows his different forms of punishment for a prolonged period and emerge unscathed, including:
Remnants of a Villain Bot - Executor falling on top of him.
Bullets being fired at him.
Crashing through solid ice.
Ice is freezing him.
Shoto and Dabi's flames burning his body.
Enhanced Strength: Tetsutetsu's physical strength increases when using his Quirk, enabling him to break through most obstacles. In his arm-wrestling match against Eijiro, his fingers dug through the concrete podium on which the match occurred. Tetsutetsu's augmented strength also allows him to tear through steel objects, such as the many industrial pipes in Ground Gamma.
Moves:
Steel Fist: Tetsutetsu, in his steel form, rushes towards an opponent and delivers a simple punch that is strong enough to shatter ice. This technique is similar to Red Gauntlet.
Horn Dash Hammer: A collaboration attack between Tetsutetsu and Pony Tsunotori. First, Tetsutetsu turns his skin into steel, and then Pony, due to her Horn Cannon Quirk, holds him with her controllable horns and launches him toward an opponent.
Tactical Intellect: Despite his hot-blooded personality, Tetsutetsu is keen and observant. In the encounter with Mustard, Tetsutetsu correctly deduced, from the latter's school uniform, that the villain was in the same age range as the U.A. students. During the third round of the Joint Training, Tetsutetsu knew that his Steel Quirk would be an effective counter to Shoto's Half-Cold Half-Hot Quirk, so he brought the two opposing students into a battle of endurance, in which Tetsutetsu was confident he could defeat Shoto. When Shoto increased the intensity of his flames, Tetsutetsu surmised that the pyro-cryokinetic was trying to force heat into his body.
Indomitable Will: Tetsutetsu possesses a selfless, heroic spirit that is more ironclad than his body. During the Vanguard Action Squad Invasion, Itsuka tried to remind Tetsutetsu that Mandalay told the U.A. students not to engage the invading villains, but the steel student starkly refused to retreat. Undaunted, Tetsutetsu voiced his resolve by reminding his classmates that they are supposed to be heroes and have to fight back against criminals who threaten them. He also has a die-hard desire to protect his comrades, as shown when he instinctively took a bullet from Mustard that was meant for Itsuka and during the Joint Training Battle, wherein he faced Shoto Todoroki, Tetsutetsu's fighting spirit pushed him further to endure Shoto's overwhelming blaze and take on his adversary, no matter the risk to his metal form melting. Tetsutetsu then affirmed that if he can't put his life on the line in training, then he won't be able to do it in the real world, as high-ranked students and limits are there to be surpassed.
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Using his Quirk for too long will cause Real Steel to suffer from iron fatigue, gradually weakening the steel's hardness. Can potentially melt from prolonged exposure to extreme heat.
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