Initially, Toshinori told the young boy that it may not be possible for someone to become a hero without a quirk. However, after seeing young Midoriya risking his life to save fellow classmate Katsuki Bakugo from a villain, Toshinori realized that he found his successor.
Toshinori passed down One for All to Midoriya and helped the boy train in order to master the quirk. It even helps that Midoriya got accepted into U.A. However, there still existed threats toward Midoriya, U.A. Academy, and the hero society such as the rise of the League of Villains and the return of All For One.