The first Quirk that Izuku unlocked wasn't the trademark super strength of All Might and One for All. Instead, the first Quirk he unlocked was Nana Shimura's Float. Starting from the last Quirk of One for All and going back to the first, he has to carve his future as the next Symbol of Peace for the good of the world. Good luck, young Midoriya. Manga spoilers, Izuku/Harem.