Steel

Steel (スティール) is a Quirk used by Tetsutetsu Tetsutetsu.

Description
This Quirk allows Tetsutetsu to turn his body into steel.

Steel is tough enough to protect Tetsutetsu from bullets and tons of falling metal, as well as other lethal hazards. Naturally, it increases his physical strength to superhuman levels too, allowing him to break through most obstacles. Tetsutetsu has said that he will gain longer and stronger use of his Quirk depending on the level of iron in his diet. It is unknown if this refers to foods that have iron in them or if he has to eat the actual metal.

Steel can protect Tetsutetsu from extreme temperatures. Ice and cold have no effect on his skin when Steel is activated, making Tetsutetsu immune against freezing. Steel may also grant resistance (not complete immunity) towards high heat, however, Tetsutetsu has noted that he went through Quirk training in order to achieve that, implying that Steel is not naturally effective against fire. His steel body gains a red coloration if exposed to flames. According to Juzo Honenuki, Tetsutetsu's body might melt if subject to a certain degree of heat.

Using his Quirk for too long will cause Tetsutetsu to suffer from iron fatigue, gradually weakening Steel's hardness. Steel doesn't protect Tetsutetsu from all forms of damage, as poisonous gas can still be effective. Tetsutetsu has noted that Steel has a set limit of hardness that cannot be improved upon, unlike Hardening.

Usage
Very much like Eijiro Kirishima, Tetsutetsu is extremely straightforward and reckless, taking fights up close and letting his Quirk protect his body from harm as he dishes out counterattacks. Also, similar to Eijiro, Tetsutetsu is able to turn himself into a human shield, blocking attacks meant for his allies.

Tetsutetsu had to undergo training in order to become immune to high temperatures.

Named Super Moves
Tetsutetsu Fist (俺拳): Tetsutetsu rushes towards an opponent and delivers a simple jab while in his Steel form. It's strong enough to shatter ice. This move is similar in nature to Red Gauntlet. First used against Shoto Todoroki during the Joint Training Arc.

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Steel