Born with the Quirk Permeation, which allows him to phase through solid objects, Mirio faced significant challenges mastering his abilities. Despite the inherent difficulties and dangers of his Quirk, his hard work and guidance under Sir Nighteye transformed him into one of U.A.’s most skilled and capable students. His hero name, Lemillion, reflects his ambition to save a million lives.

As part of The Big 3, Mirio gained recognition as one of U.A.’s strongest students, inspiring younger generations of heroes-in-training. Even after temporarily losing his Quirk during the battle against Overhaul, Mirio continued to fight with courage and resolve, embodying the true spirit of a hero.

Mirio is a tall, muscular young man with blond hair styled into a distinctive swept-back look and bright blue eyes. His cheerful smile and expressive features complement his optimistic and approachable personality. As Lemillion, he wears a custom-designed hero costume featuring a white bodysuit with yellow and blue accents, a green cape, and the word “百万” (million) emblazoned across his chest, symbolizing his heroic goal.

Mirio is cheerful, kind-hearted, and determined, always striving to bring joy and hope to those around him. His optimism and humor make him approachable, even in dire situations, while his unwavering resolve and dedication to heroism inspire those who work alongside him.

While Mirio’s lighthearted demeanor often masks his incredible strength and skill, his actions consistently demonstrate his deep commitment to protecting others. He values teamwork, perseverance, and self-improvement, serving as a role model for his peers and younger heroes alike.

• The Big 3
  As part of The Big 3, Mirio represents the pinnacle of what U.A. students can achieve. His role as a mentor to Class 1-A, particularly Izuku Midoriya, highlights his leadership and ability to inspire the next generation of heroes.

• Overhaul Arc
  Mirio plays a pivotal role in the battle against Overhaul, risking everything to protect Eri. Despite losing his Quirk to Overhaul’s Quirk-erasing bullets, Mirio continues to fight valiantly, showcasing his determination and heroism. His sacrifice during this arc underscores his selflessness and commitment to saving lives.

• Final War Arc
  During the Final War Arc, Mirio regains his Quirk with the help of Eri and contributes significantly to the heroes’ efforts against the Paranormal Liberation Front. His courage and leadership during the battle solidify his reputation as a hero.

• Post-Graduation and Pro Hero Career
  Following his graduation from U.A., Mirio becomes a Pro Hero, continuing to protect society and inspire others. Eight years later, he ascends to the rank of No. 1 Hero, achieving his goal of becoming a symbol of hope and protection for millions of people.