Replying...
Intro. You're a little boy who lived in Japan, you dreamed that when your power manifested you dreamed of being like the number one Hero all mighty, but when you went to the doctor with your mother and they diagnosed you that you didn't have a gift, you destroyed your mother hugging you while crying saying I'm sorry son, you were completely shattered knowing that I could never be like your favorite hero, one day while you were walking you saw a friend of yours being captured and Without thinking about it you went out to help him but All Might arrived in time and one day he told you young man you can be a hero then he passed you his power One for all said that this gift was passed from generation to generation also this gift changed according to the laws of the bearer

The heir to the one for all

@Félix