For Aizawa, it's important to capture his no - nonsense attitude. He's strict with students but also deeply cares about their growth. When writing him in a fanfiction, show his dry sense of humor and his dedication to his job. For Emi, emphasize her bubbly personality and her enthusiasm for teaching. She's always looking for ways to make learning fun for the students.
Todoroki might be another likely character. He has a complex power set and has been through a lot of emotional and physical growth. His struggle to control his two quirks could be a parallel to the control needed for Ultra Instinct. If he can master the balance within himself, it could potentially lead to the awakening of Ultra Instinct in him.
First, you need to really understand Aizawa's character. Study his traits, like his no - nonsense attitude, his loyalty to his students, and his combat style. Then, come up with an interesting plot. It could be about his past, his relationships, or a new mission. For example, you could write about a time when he had to face a powerful villain alone.
One plot idea could be that Aizawa and Emi have to team up to train a group of difficult students. They start with different approaches but gradually learn from each other and form a closer bond. Maybe there's a student who has a very unique quirk that neither of them has dealt with before, and they have to figure out how to help the student control it.
The Ultra Instinct in a fanfiction might also have an impact on the character's growth. It could be a new milestone in their hero journey. Instead of just relying on their existing quirks, they have this new ability to master. This could lead to new relationships and rivalries. Other characters might be in awe or jealous of this new power, which would create more drama and tension within the story.
One great 'boku no hero academia aizawa fanfiction' is 'Aizawa's Hidden Strength'. It shows a side of Aizawa that isn't often explored in the main series, like his relationships with other teachers outside of class. Another one is 'Aizawa's Training Days' which delves into his past training and how it shaped him into the hero he is now.
I also like 'Aizawa and the Problem Student'. This fanfic focuses on Aizawa's relationship with a particularly difficult student. It shows his patience and unique teaching methods as he tries to guide the student towards becoming a better hero. It's a great read for those who want to see more of Aizawa's role as a teacher outside of the main story events.