Eijirō Kirishima, a U.A. High School student training to become a pro hero, sports red spiked hair, a muscular build, and a faint scar above his right eye—a remnant of his Quirk’s accidental activation at age three. His Hardening Quirk grants him enhanced durability and strength by sharpening or solidifying his body, its potency tied to his determination. Plagued by insecurity after hesitating during a middle school crisis—while classmate Mina Ashido acted decisively—he embraced the chivalrous ideals of his idol, Crimson Riot, dyeing his hair red and spiking it as a pledge to embody unwavering resolve. Ranking second in U.A.’s entrance exams by prioritizing both combat and rescue efforts, Kirishima exemplifies bravery and loyalty, upholding a moral code that fuels his disdain for cowardice and emotional reactions to displays of courage. He shares a dynamic bond with Katsuki Bakugo, softening the latter’s abrasive edges, and rivals Tetsutetsu Tetsutetsu, whose similar Quirk spurs mutual growth. His defining growth emerges during an internship with Pro Hero Fat Gum, where he battles the villain Kendo Rappa. Overwhelmed but unyielding, he activates Red Riot Unbreakable—maximizing his Hardening for 40 seconds—to shield allies, conquering past self-doubt. Post-graduation, he rises to No. 12 Pro Hero, first as Fat Gum’s sidekick before forging an independent career. Middle school struggles with inadequacy dissolved upon rediscovering Crimson Riot’s teachings on confronting fear without regret, shaping his philosophy of relentless self-improvement and self-sacrifice. His hero costume evolves subtly post-graduation, retaining gear-shaped shoulder pads and red accents but adding a longer cape. Beyond the main series, Kirishima appears in media like the *Hero League Baseball* OVA and *Two Heroes* film, emphasizing his loyalty and camaraderie. Trivia highlights his meat-loving appetite, reverence for Crimson Riot’s legacy, and fourth-place ranking in in-universe popularity polls. His arc—from doubt-ridden teen to steadfast hero—epitomizes perseverance and self-acceptance, driven by an unshakable commitment to protecting others.