Perhaps a powerful villain from the My Hero Academia world who is jealous of Naruto's power and wants to steal it for himself. He sees Naruto as a threat to his own plans of world domination and teams up with some of Naruto's old enemies from the Naruto universe to try and take him down. Midnight and Naruto then have to fight against this combined force.
One possible plot could be that Naruto is somehow transported to the My Hero Academia universe. He meets Midnight and they team up to train students in a new, combined style of combat that incorporates Naruto's ninja skills and the quirks of the My Hero Academia world.
One common theme is her role as a teacher. Many fanfics explore how she imparts knowledge and wisdom to the students at U.A. Another theme is her heroism. They often show her in action, using her quirk to fight villains. Also, her relationships with other characters, like fellow teachers or students, are a popular theme.
In Naruto x My Hero Academia fanfiction, a cool concept is when the Naruto characters are inserted into the My Hero Academia world. Like Naruto being enrolled in UA. He would surely cause a stir with his energetic and head - strong personality. His Rasengan could be seen as a very unique 'Quirk' in that world. And Hinata could be in the same class as Ochaco, and they could become friends while learning different fighting styles from each other.
One interesting crossover could be the characters swapping their powers. For example, Deku getting Naruto's chakra and being able to use jutsus like the Rasengan. It would be cool to see how he'd adapt to that new power source and how it would change his fighting style in the My Hero Academia world.
There could be a really interesting fanfiction where Momo from My Hero Academia meets Naruto. Maybe they are in a world where quirks and ninjutsu co - exist. Momo's intelligence and ability to create objects could be paired with Naruto's determination and powerful jutsus. They could go on adventures together, facing villains from both universes.
It's not strange when you consider that creativity knows no bounds. My Hero Academia characters reading Naruto fanfiction is just another example of the crossover potential in the world of fiction. It could lead to new ideas for their own world, whether it's in terms of new hero abilities or ways to deal with villains. It's all about the exchange of ideas, even if it's across different fictional realms.
Well, Naruto fanfiction might inspire them to look for similar themes in My hero academia. For example, the idea of the underdog rising to power. Naruto was often underestimated at first, and in My hero academia, characters like Midoriya start off weak but grow stronger. So they might start seeing more potential for growth and development in My hero academia characters as they do in Naruto fanfiction.
One idea could be a fanfiction where Midnight teams up with some of the younger heroes - in - training for a special mission. It could show her mentoring them and passing on her skills and knowledge.
Well, it could be that Momo is transported to the Naruto world. She would be a bit out of place at first with her different abilities. But she quickly learns about chakra and how to use it in her own way. Maybe she creates some unique ninja tools with her quirk that help Naruto and his friends in a battle against a powerful enemy.