I just had this dumb idea the previous night regarding Dad For One.
All For One, if he is indeed Midoriya's father, seems to try real hard not to outright admit or reveal his connections to him. He always seemed more conflicted and hesitant when it comes to the boy.
Which begs the question, how will Dad For One be revealed if AFO himself doesn't even want to reveal it to others? Well, there's 4 options.
All For One blurts it out by accident when he loses control of his emotions.
All For One reveals it as a last resort to stop Midoriya/All Might
They just find out through some drawing/recording/files. (the most boring one to me, PLEASE don't make it this one)
All For One doesn't reveal it. Tomura does.
Fourth option is the idea I had last night. What if Tomura Shigaraki himself finds out now that he himself is linked to All For One and then later reveals it when he takes back control?
I mean, we know that the vestiges of One For All are in sync with Midoriya's emotions and are kinda aware of what's going on around him.
What if the same case also goes for Tomura, whose consciousness is at the backseat atm?
What if through this link, Tomura starts figuring out about All For One's connection with Midoriya, then when he momentarily takes control of his body while in a confrontation with All Might or Midoriya, he just reveals everything about it?
All For One doing the reveal? Oh yeah, AFO seems to be intentionally written to appear loke your typical cliche villain but with twists that makes him work well, and him doing the dad reveal also fits that theme.
But Shigaraki Tomura doing the dad reveal? Ohhhh boyyyy, that's just gonna set this whole fandom on FIRE and INCLUDING THE DFO THEORISTS, OH GOD. IT'LL BE GLORIOUS.