|Occupation:||U.A. High School|
|Fandom:||Boku no Hero Academia|
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Hardening: Eijiro's Quirk gives him the power to harden and sharpen any part of his body. The ability not only protects him from physical attacks, but also from heat and shock waves. Eijiro also becomes stronger to an extent. The drawback of his Quirk is that there is a limit to how much damage the hardened skin can withstand, which causes the hardening itself to slowly dissipate, and Eijiro to lose stamina. He can maintain a basic hardened state for around 10 minutes. He also has an ultimate move called Red Riot Unbreakable, in which he hardens his entire body to an extreme degree, which lasts 30 to 40 seconds.
Kirishima has startlingly sharp teeth, black hair that he dyes bright red and spikes, dark red eyes, and a small scar on the top of his right eye. 
Kirishima is a generally good guy, being very passionate and friendly, and often seen bringing the class together and even closely befriending Bakugo. He is seemingly obsessed with manliness and being manly, though this is mostly just a term for the strict moral codes he has, inspired by his hero inspiration, Crimson Riot. This results in a surprising gender-neutral code of chivalry. Kirishima is also shown to be rather self-conscious about his Quirk, perceiving it to be simple, boring, and not flashy. This is shown as early as the USJ arc, and carries on through his development.
Backstory and development
In the season 4 episode Red Riot, named after Kirishima's hero alias, we are given a look into Kirishima's past, beginning when his Quirk first manifested at the age of 4. When rubbing his eye, he cut himself with a suddenly hardening hand, giving himself the scar visible throughout the series. This leads to him resenting his Quirk from an early age.
Tropes & Fanon
- Dragon!Kirishima: When images from the BNHA Fantasy AU were first released, fans noticed that Bakugou was riding a spiky red ragon, and quickly theorized that this dragon was Kirishima. This theory was later confirmed by Horikoshi. In BNHA Fantasy AU works, Kirishima is often a dragon or a dragon shifter, able to change form between a human and a dragon.
- but i've got an angry heart, by newamsterdam -- a no-powers, College AU, slow-burn KiriBaku fic.
- We’re a good match, so let’s start a fire, Archived version by Claus_Lucas, a KiriBaku Fantasy AU fic with Dragon!Kirishima and Prince!Bakugou
- A Piece of You, Archived version, by C_AveryWrites -- a KiriDeku soulmate AU in which soulmates can share quirks
- Kirishima costume redesign, Archived version, by ohkoh, 2018
- Some Kiris from twitter!, Archived version by canarywitch, 2018
- Untitled Kirishima & Tetsutetsu fanart, Archived version by harunnn -- fancomic of Kirishima and Tetsutetsu based on headcanons by @izuqu
- Saw this crocs trend on Tik Tok and…, Archived version by vivalski -- fancomic of Kirishima and Bakugou based on headcanons about crocs