The world of My Hero Academia is heavily dominated by quirks, which also form the basis of the power system of the series. Quirks are unique abilities that people in the world of My Hero Academia are born with. These quirks manifest themselves at a very young age, and they form the basis of the big factions that exist in this world, such as Villains and Heroes.

Quirks were officially introduced on July 7, 2014, in Shueisha's Weekly Shonen Jump Issue 32, when Kohei Horikoshi's My Hero Academia made its grand debut. The strongest of these quirks was also established to be One For All, wielded by the Number One Hero, All Might. This quirk was eventually passed down to Izuku Midoriya. Now, My Hero Academia has officially shut down the strongest work forever in a brand-new era where scientific technology is growing faster than ever before. If My Hero Academia is ever to make a comeback, it will do so without its official strongest Quirk and venture into unexplored territories with scientific evolution.

All Might wielded the strongest Quirk known as One For All at the beginning of My Hero Academia . This quirk was eventually transferred to the protagonist of the series, Izuku Midoriya, and in the subsequent years, he did his best to master this power the best he could. By the beginning of the Final War of My Hero Academia, Izuku's control over One For All had grown dramatically, and he was already one of the strongest characters in the series.

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