Well, in the fanfic world of 'All for One Izuku', his character development is really interesting. At the beginning, he's this innocent kid who suddenly has this huge, dark power. He struggles a lot with whether he should use it or not. As time goes on, he realizes that the power itself isn't inherently good or bad, it's how he uses it. So he starts to train hard to master it. He also becomes more street - smart and less naive. He has to learn to deal with the villains who are after his power, and this toughens him up. He starts to see the grey areas in the hero - villain dynamic and uses his power to create a new kind of heroism that combines elements of both sides.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfiction for various fandoms, including My Hero Academia where Izuku and these powers are from. Just use the search function and type in relevant keywords like 'Izuku' 'All for One' 'One for All' to find the fanfictions you're interested in.
One interesting fanfiction could be where Izuku uses the combination of All for One and One for All in unique ways to defeat powerful villains. He might use All for One to take away the quirks of enemies and then use One for All to enhance his physical abilities to an even greater extent than normal.
Power dynamics. Since Izuku has the All for One power, how he interacts with other characters who have powers is crucial. He could be seen as a threat or a potential ally depending on the story.
Izuku's character would likely be very different. He might be more cynical at first. Since he's raised by All for One, he would be exposed to a lot of villainous thinking. But as he grows, his inborn sense of justice could start to resurface and cause internal conflict.
Bakugo is a likely candidate. Despite their rocky relationship in the beginning, Bakugo has come to respect Izuku's growth and strength. In a fight against All for One, Bakugo's powerful quirk and combat skills would be a great asset.
He becomes more confident. With the ability to control One for All, Izuku feels more in charge of his power and less like a burden. This new - found confidence shows in his interactions with others.
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.
One interesting izuku all for one fanfiction could be where Izuku uses the All for One power in unexpected ways to save his friends. For example, he might use it to transfer quirks temporarily to those in need during a battle, creating unique and exciting fight scenes.
Obviously, Izuku is the main character. He's the one who is mastering One For All. All Might also often appears as he was the previous user and is Izuku's mentor in many fanfictions. Bakugo can also be a significant character as he serves as both a rival and sometimes an unexpected ally to Izuku in his journey with One For All.