Well, in Naruto and Big Hero 6 fanfiction, a cool crossover could involve the sharing of powers. For example, some of the Big Hero 6 characters could learn chakra control from the Naruto characters. Tadashi might be interested in how ninjas train. And from the other side, Naruto could learn about modern technology and robotics from Big Hero 6. It would be fun to see how they interact and how their different skills and personalities blend together.
One interesting crossover could be where the characters from Big Hero 6 visit the Naruto world. Hiro could use his tech skills to help out in battles, like creating new types of ninja tools. Baymax could be there to heal the injured ninjas. Another idea is that Naruto characters go to the world of Big Hero 6. Naruto might be amazed by all the high - tech stuff there.
One interesting crossover could be Naruto learning about Baymax's medical technology. It would be cool to see Naruto's reaction to such advanced non - chakra - based healing methods.
A cool crossover in the fanfiction could be that some of the spells from Harry Potter are used in the Big Hero 6 world. Like the invisibility cloak could be something that the Big Hero 6 team tries to replicate using their technology. Or the characters from Big Hero 6 could help the Harry Potter crew in a battle using their advanced robotics and inventions.
One interesting crossover could be the tech sharing between Hiro from Big Hero 6 and Iron Man. Hiro might learn some advanced Stark Industries tech, which could enhance Baymax's capabilities. For example, adding more combat functions to Baymax.
In a fanfic crossover, we could see Tadashi from Big Hero 6 and Elsa having a conversation about their responsibilities. Tadashi was responsible for Hiro and his growth, and Elsa is responsible for Arendelle. They could share their experiences of feeling the weight of their duties and how they overcame their insecurities to fulfill them. This could be a really deep and emotional part of the crossover story.
One interesting crossover could be the combination of Naruto's ninja skills with the supernatural elements of High School DxD. For example, Naruto's shadow clone jutsu might be used in a unique way during a battle in the High School DxD universe. Maybe the clones could be used to distract the devils and angels while the main character executes a strategic move.
One interesting crossover could be the characters from Naruto learning about the unique shield abilities in Rising of the Shield Hero. For example, Naruto might be intrigued by Naofumi's shield and how it can transform and be used in different ways. Another aspect could be the ninjas from Naruto teaching the heroes in Shield Hero some of their combat techniques.
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.
One interesting crossover could be a story where a character from Naruto with the Sharingan, like Sasuke, ends up in the My Hero Academia world. He might use his Sharingan abilities in unique ways during hero training or battles. For example, the Sharingan's ability to copy techniques could be used to quickly learn the quirks of the My Hero Academia characters.
One interesting crossover could be the characters swapping their powers. For example, Deku having Naruto's chakra and being able to perform jutsus. It would be really cool to see how he would use them in the My Hero Academia world. Another could be the heroes and ninjas teaming up to fight a common enemy. Maybe the League of Villains and some of the Akatsuki members joining forces, and then the heroes and ninjas having to combine their skills to defeat them.