Well, Bakugo Katsuki can be quite popular too. His reaction to Izuku's transformation is often explored in these fanfictions. Some writers might show him being more protective or having a more complex relationship with Izuku as a girl. Additionally, All Might could also be a popular character as he might be involved in guiding Izuku through this strange new situation, whether it's about her new identity or how it affects her hero training.
Izuku herself is obviously a very popular character in this type of fanfiction. Since the whole story revolves around her transformation into a girl. Her friends like Ochaco Uraraka also tend to be popular as they often play important roles in Izuku's new life as a girl. Their relationship might change and develop in interesting ways.
In 'izuku turns into a girl fanfiction', Todoroki Shoto can be a popular character. He might have a different dynamic with Izuku now that she is a girl. Maybe he shows more concern or a different kind of friendship. And some female characters who might have been in the background before could become more prominent. For example, Momo Yaoyorozu could potentially have new interactions with Izuku as they are both female heroes - in - training and could bond over different things.
Well, obviously Izuku is one of the main characters, even when he's turned into a cat. His friends like Bakugo and Ochaco are also likely to be main characters. They would be the ones trying to figure out what happened to Izuku and how to turn him back. And maybe All Might could also be a main character, if he gets involved in the whole situation to help his young protege.
Obviously, Bakugo would be one of the most affected. His relationship with Izuku has always been complex, and Izuku becoming a girl would surely change the dynamic between them. He might have to re - evaluate his feelings of rivalry and superiority. All Might would also be affected. As Izuku's mentor, he would need to adjust his training methods and support system to fit Izuku's new situation as a girl.
Female Naruto herself is obviously a very popular character in these fanfictions. After all, she is the central figure with the gender - swapped concept. Sasuke also remains popular as his relationship with female Naruto can be explored in new and exciting ways. Their dynamic can be more complex and filled with different emotions compared to the original story.
Definitely his friends from U.A. High. Bakugo would be an interesting character in this scenario. He might initially be annoyed but then develop a soft spot for baby Izuku. Ochaco would also be there, using her quirk in creative ways to take care of him, like floating toys to keep him entertained.
Izuku himself is obviously a very popular character as he is the main focus. People are interested in seeing how he wields the power of the White Dragon Emperor.
Sasuke is a very common character paired with 'girl Naruto'. Their relationship, which was already complex when Naruto was a boy, becomes even more so in these fanfictions. There's often a lot of tension and unspoken feelings between them. Another common pairing is with Naruto and Kakashi. In some stories, Kakashi becomes a mentor in a different way to 'girl Naruto', guiding her through the new challenges she faces as a female ninja.
Perhaps a jealous classmate who has always been in Izuku's shadow. Now that Izuku is a girl, this classmate sees an opportunity to undermine her. They spread rumors about how Izuku's transformation is some sort of cheat or that she's not the same reliable person she was as a boy. This classmate's actions and attempts to sabotage Izuku would make them the main antagonist.
Well, in some fanfictions of this kind, Izuku as a girl might discover new aspects of her Quirk. Since the physical change could potentially affect how she uses her power. Also, there could be a plotline where she has to deal with romantic interests in a new way. As a girl, she might attract different kinds of attention from her male classmates, and she has to navigate through those new feelings and situations.
Peter Parker from Spider - Man could be an interesting choice. Imagine if Peter was turned into a girl. He would still have his spider - powers, but would have to deal with the added complications of being a female superhero in a male - dominated world.
Bakugo is often paired with Izuku in izuku time skip fanfiction. Their relationship, which was initially one of rivalry, can develop into a more complex and collaborative partnership over the time skip. They might learn from each other's strengths and work together to face powerful villains.