It's hard to say for sure. Deku has grown a lot, but All For One is a powerful villain. It depends on various factors like their current abilities and the circumstances of the battle.
In 'All for One Deku' fanfiction, it's interesting to explore the new relationships Deku would form. For example, his interactions with villains who were once on the opposite side of him. Also, the power dynamics shift. Instead of being the underdog hero, he could potentially become a more complex and morally ambiguous character with All for One's powers. His internal struggle between his original self and the new, darker influence can create really engaging storylines.
Yes, it is a somewhat popular fanfic concept. In the My Hero Academia fandom, exploring different family relationships for the characters adds an interesting twist. This concept allows for new storylines and character developments that deviate from the original canon. It gives fanfic writers a chance to re - imagine Izuku's backstory and the implications of having such a powerful and villainous father figure.
If Deku had One For All early, it could either make him a hero sooner or cause him more problems. It might make his enemies step up their game or force him to face even greater threats. It's a fascinating what-if scenario that could go in many different directions.
There are indeed. Some fanfic writers find the idea of All Might being Deku's dad an interesting twist. It can lead to some really heartwarming and intense storylines. For example, in these fanfics, All Might might have a more personal reason for choosing Deku as his successor, and Deku could inherit not only One For All but also some other traits or legacies from All Might in a more family - related way.