izuku was the son of all might the number one hero and inko yagi the number 2 hero green storm and twin brother of izumi Yagi there were a happy family but everything changed when they went to the quirk doctor and found out that izuku is quirkless because of that he was considered useless so he was abuse and neglected by his parents and builled by his sister and her friends (1A) so around the age 10 izuku decided to run away so he did and that were his life changed forever.