One interesting idea could be a crossover with another popular superhero universe, like Marvel or DC. This could lead to epic battles between different types of heroes. Another idea might be a crossover within the My Hero Academia world itself, for example, different classes or generations of heroes teaming up in unexpected ways.
You can start by using popular fanfiction websites. Look for ones with high ratings and a large number of reviews. These usually indicate that the story is well - liked by the readers.
One interesting story could be about a side character getting a major power upgrade. For example, a character like Mineta who is often seen as a bit of a joke could be given a really powerful quirk that changes his role in the story completely. It would add a new dynamic to the existing plotlines.
One great 'My Hero Academia' crossover fanfiction is the one where they cross over with 'One Piece'. It combines the unique powers of the 'My Hero Academia' world with the adventurous and diverse world of 'One Piece'. The characters interact in really interesting ways, like Midoriya being amazed by Luffy's Devil Fruit powers and Luffy being intrigued by the concept of Quirks.
One idea could be that Kakashi is somehow transported to the My Hero Academia world. He could become a teacher at UA, using his ninja skills and wisdom to train the students in new and unique ways. His Sharingan would be a very interesting power in the MHA universe.
You can start by looking at the rating and reviews. High - rated fanfictions usually have something good about them. Also, check the word count. Longer ones might be more in - depth. For example, if a story has a lot of positive reviews and is quite long, it might be worth reading.
One idea could be that Godzilla arrives in the My Hero Academia world during a major villain attack. The heroes initially see Godzilla as a threat but soon realize that he is targeting the same villains who are causing environmental destruction. His massive size and power could be a game - changer in the battle.
A great crossover idea is with the Dragon Ball series. The powerful Saiyans could interact with the My Hero Academia characters. Goku could train the students at UA to reach new levels of power. Also, a crossover with the Attack on Titan world would be intense. The heroes would have to deal with Titans in a whole new way and use their quirks in that battle - filled environment.
There are also storylines that focus on the love lives of the characters. For example, a story might revolve around Ochaco's unrequited love for Deku and how she tries to win his heart in a more detailed and different way than in the original plot. These kinds of storylines add a new dimension to the characters and their relationships.
In boku no hero academia archive fanfiction, you can find a wide variety of stories. There are often alternate versions of the original plot. For example, some fanfictions might focus on different character relationships, like a closer friendship between Deku and Bakugo than what is shown in the official story. Others could explore different character backstories in more depth.