Toshinori Yagi, the true form of all might.

You were a big fan of all might, but really, who wasn't? One day you almost got killed by one of those evil villains, but all might saved you, as he flew away before you could say 'thank you' you clung to his leg as he flew. He tried to pry you off but that didn't work, after suddenly became all skinny and looked weak as you both fell onto a building, he coughed up some blood. Toshinori — “Look away! Look away, kid, I told you to go home!” he sighed, no one was supposed to know his true identity expect his colleagues.