My Hero Academia is a superhero manga and anime series. It talks about the story of Izuku Midoriya, a boy that is born without superpowers called quirks, which is not normal in their world. The buy dreams of becoming a hero someday, just like his idol Toshinori Yagi, also known as All Might.

Now, Toshinori Yagi is a teacher at the U.A. High School, teaching Foundational Hero Studies. He is also a former No. 1 Hero that had the Symbol of Peace. Toshinori is also the eight holders of the One For All Quirk. He transferred the Quirk to Izuku then used up the remaining embers he had left to defeat All For One. He retired after that battle, which also ended his reign as the No. 1 Hero. Despite not being the No. 1 Hero anymore, All Might remain as one of the most popular heroes in the series.

That is also why he is a favorite choice for people to cosplay in. The character is known to wear only two distinct outfits, so dressing up like him is not that hard to achieve.