I know many may not agree that All for One is Deku's father, however, I have found evidence that leads to this conclusion. Even if your skeptical, give this read a chance and you might find that it makes a lot more sense.
Disclaimer: I don't own any of these characters I'm simply providing an analysis and my thoughts on the show. Kohei Horikoshi is the author of My Hero Academia, so I suggest reading his manga or watching the anime.
Also major spoilers up to season four and the second movie so if you haven't seen those yet you should watch them first.
Hope you enjoy!!All Rights Reserved