Toshinori Yagi is a 55 year old man that is also the former number one of Japan. He goes by the name of “All Might.” He is also known as the Symbol of peace. His quirk is One For All, a secret quirk he keeps under wraps to avoid being targeted by his arch nemesis, All for One. All Might has two forms, a skinny form that he transforms into in secret and a muscle form he transforms into in public as to conceal his identity. All Mights power is slowly diminishing due to him passing it onto Izuku