Well, one possible plot could be that his friends have to take care of him. They might struggle at first, not knowing how to handle a baby Izuku. For example, Bakugo could be really frustrated but gradually learn to be gentle. Ochaco might be really good at soothing baby Izuku when he cries.
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.
In the 'dadzawa and baby izuku fanfiction', it could also focus on the emotional bond between them. Maybe it shows how Izuku, as a baby, brings out a softer side of Dadzawa. For example, Dadzawa might be more patient and nurturing than he is with others in the story.
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.
One idea could be that in this fanfiction, Wolverine turns into a baby due to a powerful mutant's accidental spell. The X - Men then have to take care of him while also trying to find a way to reverse the transformation. They might discover new aspects of Wolverine's personality as a baby, like his unwavering determination is now shown through his attempts to crawl towards danger.
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.
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.
A more emotional plot could be Izuku as a cat being found by a villain who initially wants to use him against the heroes. But over time, the villain starts to develop a strange bond with the cat - Izuku. This then makes the villain question his own motives and actions.
Another aspect is the character development. He has to learn to control this new form, which means dealing with new instincts and emotions. It's like he has a whole new side of himself to explore and understand. For example, in some fanfictions, his dragon form makes him more confident in some ways but also more reckless in others. This internal struggle is really engaging to read about. Moreover, the relationships around him change too. His friends might be in awe or a bit scared at first, and how they all adapt to this new Izuku is a big part of the story.
In this fanfiction, Izuku's character development could be a journey of self - discovery. He might initially be influenced by the villain's negative view of heroes. But as he meets real heroes or witnesses heroic acts, he would start to question the villain's teachings. His development could also involve learning to control his emotions better. The villain's environment might be harsh and unpredictable, so Izuku would need to become more resilient. He would gradually grow into a complex character who has elements of both the villain's influence and his own independent, heroic spirit.