In a My Hero Academia medieval fanfiction, you might consider making the characters take on different social roles based on their quirks. For instance, Bakugo, with his explosive quirk, could be a blacksmith who creates powerful weapons that use some form of explosive element. Ochaco could be a peasant girl with a 'gravity' quirk that she discovers is actually a form of magic passed down in her family. The story could then revolve around how these characters rise above their expected social statuses and come together to fight a common threat, like an invading army of 'quirkless' barbarians who want to destroy the world of quirks.
One idea could be to have the characters in a medieval setting with their quirks being seen as magic. For example, Deku could be a young squire with a hidden 'power of magic' (his quirk) that he has to keep secret at first. Another idea is to make the League of Villains as a group of outlaws or dark wizards. They could be causing chaos in the medieval kingdom, and the heroes would have to band together as knights or mages to stop them.
Well, you could explore the idea of a medieval hero academy. Instead of modern training facilities, it would be in an old castle or monastery. The students would learn not only about controlling their quirks (which could be related to things like archery skills being a quirk or the ability to communicate with animals), but also about medieval chivalry and honor. And for a plot twist, perhaps there's a prophecy that one of the students will either save or destroy the kingdom, much like the main plot of My Hero Academia but in a more medieval context.
A cool concept for My Hero Academia fanfiction is to have a time - travel plot. A character could go back in time and change a significant event in the My Hero Academia world. This could lead to a completely different storyline. Or you could write a story centered around a villain redemption arc. For instance, giving a more in - depth look at how a villain like Shigaraki could potentially be redeemed and how the heroes would react to that. Additionally, fanfiction about a tournament between different hero agencies could be really exciting.
One idea could be a crossover where the heroes from My Hero Academia are transported to the Marvel universe. They could team up with the Avengers to fight a common enemy, like a powerful villain who has the ability to steal quirks and superpowers. For example, imagine Deku working alongside Spider - Man, learning new ways to use his quirk from him.
One idea could be a crossover with the Naruto universe. The characters from My Hero Academia could interact with Naruto characters. For example, Deku might learn some new fighting techniques from Naruto. Another idea is a crossover with the Harry Potter world. The students at U.A. could visit Hogwarts and experience magic, while the Hogwarts students could learn about quirks.
Well, you could focus on the social aspects in a My Hero Academia college fanfiction. Maybe some characters struggle to fit in because their quirks are considered odd or too powerful. Or perhaps there are rivalries between different departments, like the combat - focused department and the support department. You could also write about a college event, like a hero - themed sports festival, where the characters show off their quirks in new and exciting ways.
One idea could be that the Autobots and Decepticons arrive in the My Hero Academia world. The heroes could be initially confused by these giant robots with strange powers. For example, Izuku Midoriya might try to understand their technology and powers in relation to his own Quirk. He could see the Autobots' ability to transform as a super - power similar to a Quirk and try to learn from them. The villains in My Hero Academia might team up with the Decepticons for their own evil purposes, leading to epic battles between the combined forces of heroes and Autobots against the villains and Decepticons.
One idea could be a crossover where the characters from My Hero Academia end up in the Sekirei world. They might have to adapt to the rules there, like the Sekirei Plan. For example, Midoriya could befriend some of the Sekirei and try to help them without using their power in a harmful way. Another idea is to have a Sekirei gain a Quirk-like ability, which would be very unique in the Sekirei world and cause all sorts of interesting situations. Maybe a Sekirei with a strength - enhancing Quirk could be a great asset in the Sekirei battles.
One idea could be a story where Eraserhead and Ms. Joke team up on a particularly difficult mission. Maybe they have to infiltrate a villain's lair and their different quirks work in harmony to overcome various obstacles.
One idea could be a story where a character's quirk goes horribly wrong in a very creepy way. For example, if Deku's One For All started to consume his mind instead of empower him, making him lose his sense of self and become a menacing figure. Another could be about a hidden villain within UA who uses their quirk to create disturbing illusions that drive students mad. And a third idea might be a fanfiction where the Nomu are given a more sinister backstory, like they were once normal people whose quirks were brutally experimented on, turning them into the terrifying creatures they are now.
One idea could be exploring the backstories of minor characters during a certain period. For example, how a sidekick trained under a pro - hero before the main events of the series. Another could be a story set during a time when the hero society was in a state of transition, like when new laws about hero work were being introduced.
One idea could be a crossover where Naruto characters end up in the My Hero Academia world. For example, Naruto could meet Midoriya and they could learn from each other's determination. Another could be a story where the quirks in My Hero Academia are similar to the ninja abilities in Naruto. Maybe a character has a quirk like shadow clones. A third idea might be a time - travel fanfiction where a My Hero Academia character goes back in time to the Naruto era and has to adapt to the different fighting styles and cultures there.