One interesting idea could be how the characters' relationships change. For example, if Deku was a girl, his interactions with Bakugo might be different, perhaps less aggressive from Bakugo's side. Another idea is the change in character design. A female All Might might have a different style of hero costume, and her way of inspiring others could also be distinct. Also, the storylines could shift, like a female Todoroki dealing with her family issues in a more feminine - yet still strong - way.
Well, in this type of fanfiction, the power dynamics within teams can be really interesting. Let's say Kirishima was a girl. Her hardening quirk could be seen in a different light, maybe more of a defensive support role rather than the front - line fighter role he usually has. Also, the backstories of the characters could be adjusted. A female Kaminari might have a different reason for being so energetic and outgoing. And the shipping aspect would be completely different. Instead of the common ships we see in the original, new ships could emerge, like a gender - swapped Mina and Jiro having a different kind of friendship - turned - relationship.
Deku is definitely one of the most popular. Fans like to explore how his character would develop if he were female, especially considering his relationship with other characters like All Might and his classmates. Bakugo is also a common choice. Imagining him as a girl could completely change his hot - headed and aggressive personality, or at least how others perceive it. Ochaco is another popular character for gender - swapping. Her sweet and kind personality as a male could bring new dynamics to her relationships with the other characters.
A cool fanfiction concept could be to have a character lose their quirk and then have to find a new way to be a hero. This would show their determination and resourcefulness. Or, you could write about a new villain who has a quirk that specifically targets the heroes' weaknesses, and how the heroes would have to work together to overcome this threat.
One idea could be creating an OC with a unique quirk like the ability to control shadows but with a drawback that it only works during a full moon. Another is an OC who is a hero from a foreign country with a quirk based on their cultural heritage, for example, a quirk related to traditional dance forms that can be used to disorient villains. You could also have an OC who is a villain turned hero and has to deal with the prejudice from both sides.
One idea could be exploring Overhaul's backstory in more depth. Maybe show his childhood and what led him to become the villain he is. Another could be a redemption arc for him, where he teams up with the heroes against a greater evil.
Another interesting idea is to create a fanfiction where the characters from 'boku no hero academia' visit the Cubicity world and have to adapt to its strange rules and customs. They could face new challenges and form unexpected alliances.
Another idea could be alternate universes where the roles are reversed. The heroes are the ones causing trouble and the villains are trying to maintain order. It gives a whole new perspective on the characters and their relationships. In these fanfictions, the character development can be really fascinating as they adapt to these new roles.
One idea could be Batman somehow getting transported to the Boku no Hero Academia universe. He could use his detective skills and gadgets to help the heroes there. For example, he might be able to analyze the quirks in a way the local heroes haven't thought of before.
You could also do a fanfiction where Tsukauchi discovers a secret ability within himself. This could completely change his role in the hero world and lead to some really interesting character development as he tries to figure out how to use this new power.
Well, there's 'Female Deku in a Male - dominated World'. This fanfiction focuses on Izuku as a female in the often male - centric world of My Hero Academia. It delves into how she would face different challenges and opportunities compared to her male counterpart. It's really interesting to see how the author adapts the original story to fit this new gender - swapped scenario.
One idea could be that the heroes have to use their quirks in new and creative ways to fight off the zombies. For example, Bakugo's explosion quirk could be used to blow up large groups of zombies at once. Another idea is that some of the students get bitten and start to turn, creating a moral dilemma for their classmates on whether to save them or put them down. And a third idea could be that the zombie virus is actually a new type of quirk that has gone out of control, so they need to find the source of this 'quirk' to stop the apocalypse.