Academy, and the hero society such as the rise of the League of Villains and the return of All For One. However, there still existed threats toward Midoriya, U.A. It even helps that Midoriya got accepted into U.A. Toshinori passed down One for All to Midoriya and helped the boy train in order to master the 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. Initially, Toshinori told the young boy that it may not be possible for someone to become a hero without a quirk. It was after those 5 years that All Might came across Izuku Midoriya, a young boy who was born quirkless. 5 years later, he became a teacher at U.A. While All Might refused to step down as the Number 1 Hero and Symbol of Peace, he knew that he needed a successor for One for All. Eventually, All Might battled All For One and defeated him but at the cost of critical injuries that permanently reduced his use of One for All. Toshinori gained a new partner in Sir Nighteye, who acted as the brains of their partnership. The crime rate dropped below 6% thanks to All Might, but All For One was still around. Eventually, Toshinori went back to Japan to continue his work of heroism, becoming the Symbol of Peace and Number 1 Hero as All Might. After graduation, Toshinori traveled to the United States for training where he met David Shield and later Melissa Shield. Afterward, Toshinori was trained by Nana’s close friend Gran Torino, who was also his homeroom teacher at U.A. However, she sacrificed her life when All For One attacked. She was the one who passed One for All to Toshinori. Toshinori was trained by the 7th user of One for All, Nana Shimura. Toshinori chose to become that symbol to make sure there would be a world where everyone can smile and live happily ever after together. When he realized this as a teenager, he believed that the world needed a “Symbol of Peace” that would inspire people and bring in a new age of harmony.
Before he was the Number One Hero known throughout Japan as All Might, Toshinori Yagi was born quirkless in a world where crime rates were high due to evil running rampant thanks to the influence of All For One.