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Mirio normally appears extremely goofy and very energetic with some peculiar habits. Mirio has a very optimistic attitude and is almost always smiling. His personality is what led Sir Nighteye to believe that he could be the man to replace All Might as the symbol of peace.

Mirio doesn't let his laid-back nature cloud his judgment or hinder his dreams of becoming a hero. He has proven to be an extremely hard worker, turning a nearly invincible ability into one of the most powerful Quirks in the world. Mirio constantly looks for ways to improve his skills and tries to work towards his goals by accumulating different experiences to learn from.

Like many young men and women, Mirio was inspired by All Might to become a hero. Knowing that he cannot rescue everyone, Mirio chose the hero name "Lemillion" because he aspires to be a hero who can save over a million people. Despite Mirio's uplifting personality, he can suffer failure just like everyone else. He has an excellent understanding of hero protocols and the control of his emotions to see the bigger picture.

Lemillion and Deku acted for the greater good when they decided to allow Eri to leave with Overhaul. However, their failure to rescue her haunted them once they discovered the truth. This put a huge damper on Mirio's normally cheerful personality and burdened him with immense guilt, his guilt leading him to promise to never let Eri be harmed again, a promise he would keep no matter what.

Mirio is also extremely brave and in contrast to his laid-back nature, he is experienced in dealing with dangerous people and does not scare easily. He was able to talk to Overhaul in a normal and cheerful manner despite knowing his past as a dangerous Yakuza criminal. He also stood before the entire combined heroic force during the raid and fought Overhaul off.

Mirio is a tall young man with a very muscular build who possesses a series of notable scars around his arms. Mirio's design is very unique due to his oval-shaped blue eyes, drawn in a simplistic style with no visible sclera and prominently more rounded nose than most others. He has blonde hair whose upper part is arranged in the shape of a hood, while the lower section is pulled back.

In his school uniform, Mirio dresses like most male students, without the jacket. He wears a belt with a large rectangular gold buckle shaped like a carnivorous mouth.

Before becoming a member of the Big Three, Mirio had long hair that he wore tied in a ponytail. It is assumed that he cut it up so that the support department could use it to make him a Hero Suit that will work alongside his Quirk.

His Hero Outfit consists of a tight-fitting white shirt, with the number "1,000,000" emblazoned in yellow on his chest with matching decorations on his torso and shoulder pads. Two green lines act like a belt around his waist, some similar ones on his shoulders, which dip sharply in the center, forming two Vs. Below this, he wears loose-fitting dark blue pants and white high-top boots. knee. Over his shoulders is a long red cape, which also sports thick gloves of the same color and completes his costume with a white visor that acts as a mask.

Birthday: July 15th Age: 18 Male gender Height: 181cm Blood group: O Gift: Permeability

Permeability grants Mirio the ability to pass his body through physical matter.

Mirio can choose to make a portion of himself or his entire body intangible. This allows Mirio to seamlessly maneuver through solid objects and effortlessly evade incoming attacks.

If Mirio activates his Permeability fully, not only will his clothes fall off, but gravity will also drag his body mass along the ground. If he deactivates his Quirk while passing through the ground or another solid object, Mirio is instantly repelled back to the surface due to his own body mass being unable to overlap with any other pre-existing mass.