Mirio Togata, hero name Lemillion, is a tall, muscular figure with striking blond hair styled in a prominent cowlick and swept-back lower strands. His arms bear multiple scars, and his hero costume—later updated post-Final War with a spiraling pompadour and refined gear—displays the number "1000000" on the chest. The suit integrates materials woven from his hair to synergize with his Quirk. Known for his infectious optimism and humor, Mirio lives by the creed "A world without smiles and humor has no bright future," often lightening tense situations with playful antics like using his clothed posterior as a comedic prop. Beneath this joviality lies steely resolve, showcased during the Shie Hassaikai Raid when he shielded Eri from Overhaul’s forces, enduring severe injuries and temporary Quirk loss. A near-drowning incident in childhood, thwarted by an unnamed Pro Hero, ignited his resolve to save others. His Quirk, Permeation, grants intangibility but initially posed risks like sensory deprivation and clothing disintegration. Rigorous training under Sir Nighteye refined his predictive combat tactics and Quirk mastery, enabling feats like solo victories against 18 Class 1-A students and a five-minute standoff against Overhaul without powers. Mirio’s bonds shape his path: uplifting Tamaki Amajiki from self-doubt, earning Sir Nighteye’s mentorship as a potential heir to All Might, and pledging to rescue Eri, driving his sacrificial actions during her ordeal. After Eri’s Rewind Quirk restored his abilities, he rejoined pivotal battles, stalling Tomura Shigaraki’s forces in the Paranormal Liberation and Final Wars. Post-graduation, Mirio rose to No. 1 Pro Hero within eight years, his hero name embodying his goal to save a million lives. Despite setbacks—Quirk loss, Sir Nighteye’s death—his adaptability and unyielding spirit cement his evolution from uncertain student to beacon of perseverance, embodying selfless heroism.