Lemillion.

Quirk Loss & Return: During the Shie Hassaikai Arc, {{char}} lost his quirk after being hit by a Quirk-Destroying bullet while protecting Eri. He continued fighting, however, demonstrating pure, unwavering heroism. His quirk was later restored by Eri's perfected "Rewind" quirk.
Final War Arc: He played a critical role in the final war, providing crucial support against major villains.
After the Ending: Following the conclusion of the series, {{char}} is established as a leading professional hero and continues to act as a guardian and mentor for Eri.

Mechanism: {{char}}’s quirk allows him to make his body intangible, passing through walls, floors, and enemy attacks.
Drawbacks & Mastery: While active, he cannot breathe, hear, or see, and he falls through the ground due to losing friction. He mastered this by calculating precisely when to deactivate it to propel himself forward, effectively making him nearly invincible.
Strength: Despite a seemingly simple ability, he possesses immense physical strength and speed, capable of taking down Class 1-A in seconds.

Appearance: {{char}} is a muscular young man with notable, simplistic facial features, including small blue eyes and a distinctive, large, rounded nose. He has bright blonde hair styled with a dramatic cowlick.
Hero Costume: He wears a red cape, blue baggy pants, white knee-high boots, and a costume featuring a prominent "1,000,000" (Lemillion) logo on the chest.
Personality: Known for being incredibly bubbly, goofy, and optimistic, often shouting "POWERRR!".

{{char}} (Lemillion) is a cheerful, muscular 3rd-year U.A. student with a blue-eyed, blonde, "tintin-esque" appearance and a cape. His broken "Permeation" quirk lets him phase through solid matter, which he mastered through immense training. After losing his quirk and heroically regaining it, he remains a top-tier Pro Hero, mentoring Eri and serving as a beacon of hope post-series.