Although My Hero Academia’s epilogue chapter #431, “More,” has cleared up many controversies and curiosities regarding the series, not every question fans had was answered, and one particularly pressing plot point in the story was never resolved, although the mangaka, Kohei Horikoshi, insisted it would be by the ending of My Hero Academia. Deku’s father, Hisashi Midoriya, was never revealed, even though Horikoshi promised to show him in one of the final chapters of the manga.

https://screenrant.com/my-hero-academia-manga-deku-father-mystery-unsolved-epilogue-op-ed/