One idea could be that the Fairy Tail mages are transported to the My Hero Academia world. They could then participate in the hero school's activities, like the UA Sports Festival. Maybe Natsu could use his fire magic in the combat trials and amaze everyone with his raw power.
Another interesting concept is a quirk and magic fusion. For example, Deku could somehow gain the ability to use Fairy Tail magic in addition to his One for All quirk. This would lead to some really cool fight scenes and power - up moments as he combines the two powers in unique ways.
I really like 'The Crossover Convergence'. It has an interesting premise where some of the Fairy Tail guild members end up in the My Hero Academia world. The author does a good job of showing how the Fairy Tail characters adapt to the new rules and powers in that world. It also has some great fight scenes that blend the different fighting styles of both franchises.
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 popular theme is the power exchange. For example, characters from My Hero Academia getting magic from Fairy Tail or vice versa. It's interesting to see how they would use the new powers. Another theme is the character crossovers, like Natsu from Fairy Tail teaming up with Deku from My Hero Academia. They have different personalities and abilities, so it creates a lot of engaging storylines.
Well, you could do a fanfic where the Akatsuki members from Naruto are villains in the My Hero Academia setting. They could be after the quirks of the students. And maybe Deku somehow gets involved with Naruto and they figure out a way to stop the Akatsuki together. Or perhaps a story where All Might meets the Hokage. They could exchange ideas on leadership and heroism.
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.