Mirio Togata, hero name Lemillion, stands as a prominent hero. His path began in childhood after a near-drowning where a Pro Hero's rescue ignited his own heroic ambition, though his father voiced concern over the complexity of his Permeation Quirk. Initially difficult to control, this power allowed phasing body parts through solid objects. In third grade, he forged a key friendship with Tamaki Amajiki, recognizing Tamaki's hero interest and supporting him through social anxiety. Middle school saw Mirio persistently struggle with his Quirk during training classes, often drawing laughter when only managing to phase his hands through walls. Undeterred, he resolved to improve. He bolstered Tamaki's confidence about his Manifest Quirk, praising Tamaki's resolve and calling him talented and fun. Enrolling at U.A. High School, Mirio initially performed poorly, including in the U.A. Sports Festival. His trajectory shifted dramatically upon interning under Sir Nighteye; rigorous training led to mastering Permeation. This mastery earned him recognition as one of U.A.'s elite "Big Three" alongside Tamaki and Nejire Hado. Mirio's Permeation Quirk grants precise intangibility through matter, controlling timing and positioning. Mastery enables tactical maneuvers like instant directional ejection after phasing. Sir Nighteye's training honed his predictive combat skills, physical prowess, and reflexes, allowing efficient defeat of multiple opponents. He demonstrated superior technique by incapacitating 18 Class 1-A students within seconds during an exercise. His fighting style integrates Quirk-based evasion with powerful strikes, often using partial phasing to create openings. Personality-wise, Mirio radiates relentless optimism and cheer, frequently smiling to inspire. He maintains this demeanor even in adversity, driven by his commitment to save one million people—embodied in his hero name. He employs quirky humor, like using puppetry to amuse Eri. Beneath this lightness lies profound resolve; he prioritizes others' safety absolutely. This is exemplified when he shielded Eri from Overhaul's Quirk-Destroying Bullet, knowing it would cost his powers. His bravery shines confronting high-level villains like Overhaul fearlessly, and his leadership during coordinated missions is evident. Even after losing his Quirk, he remained steadfast in his hero aspirations, refusing Izuku Midoriya's offer of One For All and accepting his quirkless state while supporting peers. A pivotal moment occurred during the Shie Hassaikai Raid. Mirio fought Overhaul, Chronostasis, Shin Nemoto, and Deidoro Sakaki single-handedly to protect Eri. He withstood Nemoto's truth-inducing Quirk and Sakaki's balance-disrupting ability, overpowering them before engaging Overhaul. When a Quirk-Destroying Bullet targeted Eri, Mirio intercepted it, sacrificing his powers. Quirkless, he shielded Eri from Overhaul for five more minutes, earning Nemoto's awe for his tenacity. The incident left him guilt-ridden over failing to rescue Eri earlier but solidified his vow to protect her. Post-raid, Mirio adapted to quirklessness while mourning Sir Nighteye's death. He stayed active in U.A.'s hero program, aiding evacuation drills and student training. Six months later, during the Paranormal Liberation War, Eri's restored Rewind ability returned his Quirk. He immediately joined the fight, repelling Near High-End Nomus alongside Nejire Hado, Tenya Ida, and Katsuki Bakugo. In the Final War, Mirio served as a tactical relay across the floating U.A. Fortress, using Permeation for rapid intel dissemination. He battled Tomura Shigaraki alongside the Big Three, emerging unscathed. He later provided Izuku critical insights into Shigaraki's psychological triggers and humorously exposed himself to distract Shigaraki, buying Izuku recovery time. After graduating, Mirio became a Pro Hero. Eight years post-Final War, he achieved the rank of No. 1 Hero. His costume evolved to feature a spiraling pompadour, a white chest plate stamped with "1000000," elongated gloves, and boots with track-patterned soles, symbolizing his enduring million-save commitment. Physically, Mirio is tall and muscular with blond hair styled in a distinctive cowlick. Post-graduation, his hair grew into a long pompadour with shaved sides. Scars mark his lower arms from combat. His hero costume comprises a white bodysuit stamped with "1000000," baggy blue-and-white pants, red gloves, a cape, and knee-high boots. Minor adjustments occurred over time, like added pouches or altered trimming, reflecting his progression.