Hardening: Eijiro Kirishima’s Quirk in My Hero Academia explained

Eijiro Kirishima, a student at U.A. High School and a pivotal character in My Hero Academia, stands out with his indomitable spirit and a Quirk that makes him the ‘unbreakable’ hero. 

Let’s explore the character’s powers, encompassing the mechanics of his Quirk, its applications in battle, and its inherent limitations.

Core Dynamics

Kirishima’s Quirk, “Hardening”, allows him to harden his skin to steel-like levels of durability. The transformation can be localized or cover his entire body, depending on the situation. When activated, his skin takes on a reddish, ragged appearance.


Augmented Strength: Hardening increases the density and mass of Kirishima’s limbs, thereby amplifying his physical strength and making his punches and tackles devastating.

Piercing and Cutting: With his ability to concentrate hardening to form sharp edges, he can cut or pierce through softer materials and enemies.

Impervious Shielding: His hardened form can withstand tremendous impacts, from falls to blows from powerful Quirks, making him an excellent shield for his allies.

Endurance and Stamina: Kirishima can endure prolonged battles, as his Quirk acts as armor against fatigue-causing blows.

Rescue Operations: He can use his hardening to protect civilians or teammates from debris, explosions, or other hazards.

Environmental Interaction: He can also tunnel through walls or create footholds in hard surfaces by punching or kicking to create handholds or steps.

Advanced Techniques

The Quirk has grown significantly since its initial introduction.

“Unbreakable” Form: Kirishima has developed an advanced state of his Quirk called “Unbreakable,” which significantly enhances his defensive and offensive capabilities for a short duration.

Technique Refinement: Ongoing training and real-world combat have allowed Kirishima to increase the speed at which he can harden and maintain the form for longer.

Image Source: Bones Inc.


Despite its apparent strengths, Hardening is not without its drawbacks.

Limit to Durability: There is a limit to how much damage Kirishima’s hardened body can absorb before it begins to crack and weaken.

Physical Strain: The continuous use of his Quirk, especially at its maximum hardness, can be physically taxing, leading to exhaustion.

Lack of Range: Kirishima’s Quirk is predominantly melee-based, putting him at a disadvantage against long-range or area-of-effect attacks.

Character Implications

Eijiro Kirishima’s Hardening Quirk serves as a profound testament to his character arc and role in My Hero Academia. It allows for dynamic battles that demonstrate both raw power and the unglamorous hard work of heroism. 

In his own words, his power may not flash, but it’s firm, reliable, and in many ways, embodies the heart and soul of what it means to be a hero. 

Also Read: Cremation: Dabi’s Quirk in My Hero Academia Explained

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