Though I think All Might won't die bc if so then the whole Nighteye arc would be 10000x more sad since Deku won't be able to twist that future. This gave me a wider view of the story!! I don't think this theory is true because Inko when they were at the doctor when Deku was young the mother said the father has the fire quirk so this is not possible to definite All for one his father because he has the "same" quirk of All might and All might doesn't have the fir quirk So basically Deku's Father Hisashi Midoriya, has been out of the story the whole time. So the first number of facts. All for One might be going around impregnating women just like Endeavor does to maybe find a successor but then he first found Shigaraki before knowing about Deku, he might thought he won't need Deku anymore and sent out the Hakase to remove Deku's original quirk (something might be similar to His') well idk. Then he eventually trains with Yoda on Dagobah.4. If Torino could be compared to Yoda, and if Izuku is the Luke Skywalker of My Hero Academia, and All Might is to Obi-Wan, then what would that mean for All For One? We have no clue what his dad looks like, and Deku looks mostly like his mom, so it's hard to pick traits that could come from another person. This also mirrors how Luke fights Vader after training to become proficient with his powers and he's basically outclassed by Vader. At the start if the series, Deku is a quirkless child who has a loving mom and a dad that has job that causes him to travel a lot. Vader and All Might are both responsible for the death of All Might and Obiwan's masters, and All Might an Obiwan both have a student they've been entrusted. So, how does this relate to My Hero Academia? (I also wanted to say that I'm not sure if I'm the first person to come up with this reasoning, but I just thought I would share why I support this theory.) Why? I do hope the story goes that way, it would be really interesting then! Darth Vader kills Obiwan, and eventually Luke Skywalker rises up to defeat Darth Vader, only to lose a hand, and find out that Darth Vader is his father. In this story a dark side user killed Obiwan's master and then Obiwan fights Darth Vader, his long faded enemy. All Might tells Deku one day he'll have to fight All for One. But this training for Luke Skywalker isn’t enough. P.S I don't hope for this to have any spoilers, but I might spoil something for someone that I'm not supposed to. All Might and All for One go back a long time due to their battles with each other and the fact that they're heated enimies like Obiwan and Vader. Meanwhile, what if that’s the same realization Deku might be getting set up to face.Proof: Deku’s Doctor, is the SAME doctor that is working with and for All For One: Dr. Tsubasa.
Now, having a fire quirk, this is completely possible for All For One.Now some people would automatically think that this could make Endeavour–Deku’s father, but that at this moment this theory still seems quite far fetched, and not really possible. This gave me a wider view of the story!! This could be an implication that since Midoriya’s father has been away for so long, that there is an important/pivotal moment involved in regards to Deku’s father.Hisashi Midoriya is also said to be a Fire user. But he also has dug a little deeper for references.
We all know that Horikoshi is a big fan of Star Wars. Quotes Celty Sturluson Quotes “The world isn’t as cruel as you take it [...]YESSSSS!!! Basically, All for One and Deku are like Vader and Luke, and since we don't know who Deku's real father is and All for One is pretty mysterious, always has things planned, and has messy hair similar to Deku it all adds up that there is a possibility All for One is Deku's father.
Some people might think my statement is false because Deku's mom, Inko Midoriya said in the beginning of season 1 that Deku's father has a quirk that allows him to breathe fire.