One interesting story could be where Izuku gains some of Captain Marvel's powers and has to learn to control them in a world full of villains. He might struggle at first, like he did with One For All, but gradually master it.
There are fanfictions that focus on Captain Marvel's origin story but with a twist. Maybe in this version, she gets her powers from a different source than in the official story. It could explore how this new origin affects her personality and her relationships with other characters in the Marvel universe.
Well, in some Captain Marvel lemon fanfiction, they might explore her relationships in a more romantic and sometimes over - the - top way. But this kind of fanfiction can be quite divisive among fans. Some fans like the creative take on her character, while others think it strays too far from the essence of Captain Marvel. For example, a story could have her falling in love with an unexpected character and having to deal with the challenges that come with that in a very different setting than what we see in the official Marvel movies or comics.
A great fanfiction could be set in a post - Endgame world. Captain Marvel has been away for a long time and when she returns, she finds that Black Widow's sacrifice has left a big hole in the Avengers. She decides to honor Black Widow's memory by training a new generation of female heroes, inspired by Black Widow's skills and tenacity.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and you might be able to find some great izuku captain marvel ones there.
A crossover with Doctor Strange could be really cool. Maybe they have to deal with a magical threat that is spreading across different dimensions. Captain Marvel's strength and Doctor Strange's magic would create an interesting dynamic as they try to figure out how to stop it.
One idea could be a time - travel fanfic where Captain Marvel and Captain America team up in a different era. Maybe they end up in the 1920s and have to deal with a Hydra - like threat that's starting to form early. Another could be a fanfic where they swap powers for a day and have to learn to adapt to each other's abilities. For example, Captain America trying to control Captain Marvel's photon blasts and Captain Marvel having to rely on just her combat skills like Cap usually does.
One idea could be Captain Marvel bringing back some alien tech that the Avengers have to figure out how to use. It could lead to new powers for some of the members or a new way to defend Earth.
One interesting plot could be a race. Sonic challenges Captain Marvel to a race, not realizing she can fly at incredible speeds. Captain Marvel accepts, thinking it will be easy. But Sonic's ability to use his environment and his quick thinking gives him an edge. In the process, they learn more about each other's abilities and personalities. And then they have to face a threat that requires both their skills to defeat, like a powerful magic - using villain who can manipulate time.
Imagine a fanfiction where Captain Marvel uses her energy - based powers in a completely new way during the final battle in Avengers: Endgame. Instead of just punching and flying around, she could manipulate the energy fields in a way that disrupts Thanos's entire army. This would be a creative take on her character and her abilities.
One interesting Captain Marvel tickle fanfic could be one where she is in a light - hearted sparring session with a fellow hero and it turns into a ticklish encounter. Maybe the other hero accidentally discovers she is ticklish and there's some friendly teasing involved.