Mirio Toogata is a prominent student at U.A. High School in the anime series Boku no Hero Academia. Known by his hero name 'Lemillion', he is part of the prestigious 'Big Three', the top three students at U.A. Mirio is cheerful, determined, and highly skilled, with the Quirk 'Permeation', allowing him to phase through objects. Throughout the series, he serves as a mentor and inspiration to Izuku Midoriya and other students, playing a crucial role in the fight against the villain Overhaul.