If Naruto ate the Pika Pika no Mi in fanfiction, he'd be a really unique character. He could potentially use his new light - based powers in combination with his existing ninja skills. For instance, he could use light clones instead of shadow clones. And his rasengan could be infused with light energy, making it even more powerful and destructive. His mobility would also change as he could move at the speed of light in certain situations, allowing him to quickly get in and out of battles.
Naruto's character development would be quite interesting. With the Pika Pika no Mi, he would start to view battles and challenges from a different perspective. He might become more strategic, using his light powers to outwit his opponents. Also, his relationships with other characters could change. Some might be in awe of his new powers, while others might be a bit jealous. He'd also have to deal with the limitations of the devil fruit, like not being able to swim, which could add an element of vulnerability to his otherwise fearless character.
The change in its appearance can make it scary. For example, if its usually cute yellow fur turns dark or if its bright red cheeks become a sinister red glow. Also, if it starts to behave in an uncharacteristic way, like making menacing noises instead of its usual cute sounds.
Obviously, the main characters are usually Pikachu. But sometimes, there could be other Pokémon that play important supporting roles. For instance, a Pichu could be a sidekick or a younger Pokémon that the Pikachus are protecting.
One interesting plot could be two Pikachus from different regions meeting and learning about each other's unique electric attacks. For example, one Pikachu might know a special move that the other has never seen before. They could then teach each other and become stronger together.
Naruto would probably be really excited. He'd treat Pikachu like a new friend and teammate. He might try to learn all about Pikachu's powers and how it can help in battles. For example, he'd be eager to see Pikachu use Thunderbolt in a fight against an enemy ninja.
Lucario is also a popular choice to be paired with Pikachu in crossovers. Lucario has its own unique abilities related to sensing and combat. When combined with Pikachu's electric attacks, they can form a formidable team. The contrast between Lucario's more serious and stoic nature and Pikachu's cute and energetic personality also adds depth to the story.
Well, Naruto's chakra-based powers and Pikachu's electric powers can combine in some fanfictions. For instance, Naruto could use his Rasengan and Pikachu could add its electric charge to it, creating a super - charged attack that is more powerful than either of their individual attacks.
Brock could be a great addition. He could provide some comic relief and also be the voice of reason. For example, when Ash and Pikachu get into some crazy situations, Brock could be the one to offer practical solutions.