In many ways, the suit-wearing pro hero Sir Nighteye is the same kind of unofficial father figure that Shota Aizawa is, and not just because they are both pro heroes with something to teach. Sir Nighteye is a middle-aged man and a smart, practical pro hero who wishes to follow protocol and get the job done no matter what, which is a great way to run any pro hero agency.
That made Sir Nighteye a strict but good-hearted father figure and mentor for Bubble Girl, Mirio Togata, and eventually Deku as well. Sir Nighteye showed his kinder, warmer side on his deathbed, sharing inspiring words to his friends and allies while they wept for his impending demise. Overall, fans might call Sir Nighteye an emotionally distant but well-meaning parental figure who wants his “children” to impress him before showing how much he loves them.
The symbol of peace himself, All Might, has been nicknamed “Dad Might” thanks to his parental role in Deku’s life. Izuku Midoriya’s real father has never appeared, so when Deku and All Might became allies, All Might filled in as Deku’s unofficial foster father. All Might also made it wonderfully clear how proud he was of Deku, and did everything he could to emotionally support the boy.
All Might’s methods as a coach and foster father figure were imperfect because of his inexperience in those fields, but as a heartfelt hero, he tried his best the whole time, for which Deku is grateful. By now, All Might is less of a parental figure than ever for Deku, but he has still done much to mold Deku as a brave, idealistic, and powerful symbol of peace who will save the world from villainy.