Eijiro Kirishima embodies determination and resilience, driven by a steadfast dedication to heroism and self-improvement. His Quirk, *Hardening*, grants him the ability to solidify his body into a rock-like state—a power he once deemed unremarkable, plagued by self-doubt after a pivotal middle school incident. Witnessing Mina Ashido confront bullies while he hesitated, Kirishima branded himself a coward, a moment that fueled his resolve to change. Inspired by Crimson Riot’s philosophy of unyielding bravery, he adopted a vibrant red, spiked hairstyle as a testament to his vow to act fearlessly and protect others without hesitation. At U.A. High, Kirishima’s boisterous, earnest personality flourished, marked by his frequent use of “manly” to praise acts of courage. His loyalty propelled him to defy rules when aiding friends, prioritizing their safety above all. Initially challenged academically, he honed his tactical skills through relentless effort, evolving into a strategic combatant. His physical endurance, amplified by *Hardening*, allowed him to withstand brutal assaults—from explosions to bullets—while his unshakable willpower pushed him past breaking points, such as enduring Kendo Rappa’s relentless blows during the Shie Hassaikai raid. In the *World Heroes’ Mission* arc, Kirishima joined Fat Gum’s team in global operations against Humarise, contributing to anti-terror raids, though specifics of his role remain sparse. Post-graduation, he rose to Pro Hero Rank No. 12 within eight years of the Final War, retaining his iconic appearance and unwavering ethos. Kirishima’s bond with Katsuki Bakugo, rooted in mutual respect, and his rivalry-turned-camaraderie with Tetsutetsu Tetsutetsu underscore his role as a unifying force who champions teamwork. His journey—from a self-questioning student to a pillar of confidence—epitomizes perseverance, redefining strength as the courage to shield others even in the face of fear.