Toxin - The Deadly Hero (izumomo)

Izuku Midoriya was a struggling kid. His mom was dying, and his bullying continued to get worse. He was told as a little boy that he had a quirk because of his 3 jointed toe, but it hadn't manifested, so everyone assumed he was quirkless. That all changed when Bakugo told him to take a swan dive. With one of the strongest quirks in existence, Izuku pursues his dream of being the #1 hero.

I don't own MHA or toxin. Just the plot of the story.