Steel And Hardening

These quirks are used by Eijiro Kirishima and Tetsutetsu Tetsutetsu.

 Eijiro Kirishima 

Kirishima's quirk is hardening. Kirishima is an overall nice guy and even trys to make Bakugo stop being mean. He failed.

 Tetsutetsu Tetsutetsu 

Tetsutetsu's quirk is steel. In the UA Sports Festival Tetsutetsu and Kirishima are rivals as their quirks are basically the same.

 Hardening 

A quirk used by Eijiro Kirishima. This quirk allows you to harden perts of your body to use for defence, offence or fun, like Kirishima did in the music show Class 1A did. He used his hardened arm to chip away at the ice to create snowflakes.

 Steel 

This quirk is used by Tetsutetsu Tetsutetsu. It's quite similar to hardening. It allows the person to change body parts into steel. Again, this can be used for defence, offence or fun. We unfortunatly don't see Tetsutetsu very much so we don't see him use his quirk for any of these things apart from the UA Sports Festival.