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.
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.
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.
One interesting plot could be Izuku developing new and unique powers that no one has ever seen before. For example, he might gain the ability to manipulate time on a small scale, which would add a whole new dimension to his battles and his journey to become the strongest.
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.
Well, perhaps there's a plot where Naruto as a cat has to team up with other ninja animals to go on a mission. They might face challenges like crossing a dangerous forest or finding a hidden treasure. And his cat form could give him some unique abilities, like super - sensitive hearing that helps them detect approaching enemies.
Another plot might be a young cat's journey to discover a long - lost prophecy that could save all the clans from a great danger. This cat has to overcome many obstacles and meet various characters along the way.
One possible plot could be Lelouch, as a girl, using her new identity to infiltrate an all - female organization that was previously off - limits to him as a male. She could use her charm and wits in ways that are different from when she was male, creating unique storylines.
One interesting plot could be Mario, now as a girl, having to navigate the Mushroom Kingdom in a different way. Maybe she discovers new powers that come with her new form and uses them to save the kingdom from a new threat.
One interesting plot could be Batman, as a girl, using her unique charm and different approach to outwit villains. Maybe she uses her new - found femininity to get closer to female villains and understand their motives better. For example, she could infiltrate an all - female criminal organization in a way that the male Batman couldn't.
One interesting plot could be Naruto, as a girl, having to deal with the different reactions from his friends. For example, Sasuke might be initially shocked but then gradually develop a different kind of friendship. Another plot could be Naruto using her new female form to infiltrate an all - female group in the ninja world to gather intelligence for the village. Also, Naruto as a girl might have to face new challenges in training, like having to adapt to different fighting styles that are more suitable for a female body.