One interesting storyline could be Mount Lady facing a new type of villain that can manipulate the earth in ways she's never encountered. This forces her to use her quirk in creative ways to overcome the threat.
A great storyline might involve Mount Lady mentoring a young hero - in - training. She has to teach them about controlling their power, just like she had to learn, and along the way, they both grow as heroes. It could also show a different side of her, more nurturing and responsible.
In some fanfictions, there might be a storyline focused on the origin of the 'Flame On' concept. It could be tied to an ancient civilization within the 'My Hero Academia' world. A group of young heroes stumbles upon this secret and has to protect it from villains who want to use it for their own evil purposes. They learn about the true power of the flame - on quirk and how it can change the balance of power in their world.
One interesting storyline could be Izuku and Melissa teaming up to create a new support item. Since Melissa is great at making support items in the 'My Hero Academia' world, and Izuku has a deep understanding of how quirks work. They might combine their skills to make something that helps Izuku enhance his quirk in a new way.
Another character often paired with Mount Lady is All Might. Maybe in a 'what - if' scenario where they train together, or she has to save him at some point. Their interactions could explore different power dynamics within the My Hero Academia universe.
One interesting storyline could be Deku finding himself in Wakanda through some sort of quirk accident. There, he meets Black Panther and they team up to fight a common enemy. Maybe a villain has stolen some important Wakandan technology and is using it to create chaos in both their worlds.
One possible storyline could be how Female Izuku deals with her pregnancy while still trying to maintain her hero training. Maybe she has to find new ways to use her quirk safely for the sake of the baby.
One popular storyline could be about a character receiving a mysterious gift that unlocks a new quirk or power. For example, Midoriya might get a gift from an unknown source that gives him the ability to control time for a short period, adding a whole new dynamic to his battles and character development.
One possible storyline could be the characters from My Hero Academia celebrating Christmas together at UA High. They could exchange gifts, with Deku getting a special All Might-themed item from his friends. Another idea is that the villains, for a change, have a truce during Christmas and experience the holiday spirit in their own way. Maybe Shigaraki gets a small moment of peace and reflects on his life.
One popular storyline is the 'What if' scenarios. For example, what if the main character had a different quirk? Another is the character development outside the canon story, like exploring Bakugo's past more deeply. And there are also storylines where minor characters get more spotlight and their own heroic arcs.
One great storyline in My Hero Academia god fanfiction could be a god - like villain. This villain could have powers that seem almost unbeatable, like the ability to rewrite reality. It would create a huge challenge for the heroes, forcing them to think outside the box and work together in new ways. Maybe they'd have to find a way to nullify the villain's god - like powers.
There could be a fanfiction where Melissa and Deku are paired for a school project at U.A. High. They initially have different ideas but gradually learn to work together. During the project, they discover a hidden danger within the school that is related to a new type of quirk - erasing device. Together, they have to find out who is behind it and stop it before it affects all the students.