One great Naruto MHA fanfic is 'Naruto in the My Hero Academia World'. It's really interesting to see how Naruto's ninja skills translate into the MHA universe with its own set of superpowers. Another good one could be 'MHA meets Naruto: The Crossover'. It often has unique plotlines that combine the best elements of both series.
A significant theme in 'naruto mha crossover fanfic' is the exploration of different power structures. Naruto's world has a more traditional hierarchical power structure with villages and clans. In MHA, the power structure is based on hero agencies and schools. When these two worlds collide, the fanfic often explores how the characters from each world adapt to the other's power structure. This can lead to some really interesting story developments, like Naruto trying to understand the concept of hero rankings in MHA or MHA characters getting involved in the politics of Naruto's villages.
One interesting fanfiction could be about a crossover where characters from MHA and Naruto meet in a special dimension. For example, Deku could meet Naruto and they learn from each other's unique powers. Another might be a story where the quirks in MHA are introduced to the Naruto universe and how it disrupts the existing power balance. There could also be a fanfic that focuses on a character from MHA being transported to the Naruto world and having to adapt to the ninja way.
You can find Naruto MHA fanfics on websites like Archive of Our Own (AO3). It has a large collection of fan - made stories, and you can easily search for Naruto MHA crossovers. Fanfiction.net is also a good place. There are many different authors posting their works there, so you're likely to find some interesting Naruto MHA fanfics.
The MHA characters' reactions could vary widely. For instance, All Might might see the Naruto fanfiction as a great source of inspiration. He could admire the way the characters in Naruto strive for their goals, just like heroes in their own world. Todoroki might be a bit detached but still interested. He'd analyze how the power systems in Naruto compare to quirks in their world. Mineta would probably be more interested in any fan service - like elements if there were any, but that's not a very positive reaction. Overall, it really depends on each character's personality.
You can start by looking on fanfiction.net. It has a large collection of both MHA and Naruto fanfictions, and you can easily search for crossovers. Archive of Our Own (AO3) is also a great place. It has a more organized tagging system, which makes it easier to find specific types of fanfictions, like those focusing on certain character relationships or plot elements that involve both MHA and Naruto.
Perhaps an ancient artifact in the MHA world has the power of the Naruto toads sealed within it. A villain discovers it first but a young hero - in - training manages to steal it away. Once in their possession, they unlock the toad quirk. They would then need to train hard to master it, just like Naruto did. They could call on the toads for help in battles, use their strong physical attacks and even learn some of the toad - related ninjutsu, adapting it to fit the rules and physics of the MHA world.
One idea could be that Naruto characters visit the MHA world and have to adapt to the modern society and different power system. For example, Naruto might be intrigued by how quirks work compared to chakra. Another plot could involve villains from both universes teaming up, forcing the heroes from Naruto and MHA to collaborate. They would need to combine their unique fighting styles and powers to defeat the combined threat.
Characters' personalities play a huge role. For example, Dabi, who has a bit of a dark and brooding personality, might be drawn to the more complex and morally grey characters in Naruto fanfiction. He might relate to some of the characters who have had a tough past. In contrast, Ochaco, being a positive and empathetic character, would focus on the emotional parts of the fanfiction, like the friendships and the characters' dreams. And then there's Tokoyami, with his rather mysterious and deep - thinking nature. He'd be delving into the philosophical aspects of Naruto, such as the concept of the ninja way.
They would be very powerful. Just like Naruto can summon giant toads, this character could summon toads in the MHA world. They could use the toads as mounts or have them fight alongside. For example, they could have a toad use its tongue to grab villains and hold them in place.