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.
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.
Pikachu would likely be very angry. It loves Ash deeply and being separated from him would make it furious. It would probably immediately start attacking Team Rocket with its electric attacks. It might also try to find a way to communicate with Ash, perhaps by using its electrical signals in a way that Ash could somehow detect from a distance.
Ash would be completely devastated. Pikachu has been his closest companion since the start of his journey. He would probably go into a state of shock at first, unable to believe that Pikachu was gone.
One common reason could be jealousy among other Pokemon. Some Pokemon might be jealous of Pikachu's closeness to Ash and its popularity. So, they might plot against it and end up killing it. Another reason could be a misunderstanding. For instance, a wild Pokemon might misinterpret Pikachu's actions as a threat and attack it fatally.
Well, Pikachu's popularity in fanfics is no surprise. It's been the face of Pokemon for a long time. In fan-written stories, Pikachu can be depicted in various ways. Sometimes it's a super powerful version of itself, being able to defeat even the toughest of opponents single - handedly. And since it's so well - known, readers are immediately drawn to stories that feature Pikachu, whether it's a story about its origin or its future adventures.