Yes, there are quite a few out there. Some explore how All Might's relationship with Izuku would change if he was his father. For example, in some fanfics, All Might starts training Izuku much earlier in his life, which gives Izuku a huge advantage in developing his quirk. These fanfics often delve into the emotional side of their relationship as well, like how Izuku might feel having a hero as a father.
One common theme is the passing on of the hero legacy. All Might would be in a unique position to train Izuku and teach him everything he knows about being a hero. Another theme is the exploration of family secrets. How did Izuku not know All Might was his father? And how does this revelation change their relationship and the world around them?
In many adopted Izuku fanfictions, his character develops confidence. For example, if he's adopted into a loving family, he no longer has the self - doubt that plagued him before. He starts to believe in his abilities more. This new family support gives him the boost he needs to train harder and become more assertive in his hero journey.
In these fanfictions, Izuku often has to face a lot of internal conflict. For example, if he's experimented on and gains new powers, he might question his identity. Is he still the same Izuku who wanted to be a hero just for the sake of helping others? This self - discovery is a big part of his character development.
In some fanfictions, Izuku becomes more confident. With the One Punch power, he no longer has to worry about being physically overpowered. So he can stand up to bullies like Bakugo more easily, which boosts his self - esteem.
Izuku with Star Platinum's power would become more strategic. Star Platinum has unique abilities like time - stop. Izuku would need to learn how and when to use these powers effectively. This would force him to think several steps ahead in a fight, changing his character from someone who might have been more impulsive in combat to a more calculated fighter.
These fanfics explore Izuku's character differently by highlighting his adaptability. Since he doesn't have a quirk like others, he has to adapt to different situations in unique ways. He might use his knowledge of quirks to his advantage in a way that those with quirks don't even consider. Also, his relationships are often more complex as he has to overcome the stigma of being quirkless. He might form deeper bonds with those who see his true value regardless of his lack of a quirk.
Well, initially, Izuku might be overwhelmed by his new cosmic quirk. But as he trains, he becomes more confident. For example, he could start by accidentally causing small cosmic disruptions and then learn to control them precisely.
In izuku muscle growth fanfics, Izuku often becomes more confident. His physical growth gives him a sense of self - assurance that he may not have had before. He starts to believe more in his abilities, which in turn changes his approach to challenges.
Izuku might become more self - conscious about her appearance in this fanfiction. Since she is a girl, she could face different beauty standards, which may influence her confidence in different ways compared to when she was male - presenting in the original story.