One popular theme is the adventure of Pikachu and the trainer in the world of Pokemon Red. They might go on a journey to discover rare Pokemon. Another theme could be Pikachu's special bond with the trainer, showing how they communicate and support each other. Also, stories might focus on Pikachu's growth in power and its role in battles against tough opponents.
You can try looking on fanfic websites like FanFiction.net or Archive of Our Own. They usually have a large collection of Pokemon - related fanfics, including ones related to Pikachu from Pokemon Red.
In a 'pokemon red's pikachu fanfic', it might focus on Pikachu's growth. For example, how it becomes stronger not just in terms of battling but also in its understanding of the Pokemon world. It could also explore Pikachu's emotions, like how it feels when separated from Ash or other trainers in the fan - created scenarios.
Writing a great Pokemon Red and Pikachu fanfiction involves several steps. You need to immerse yourself in the world of Pokemon. For the characters, base Pikachu's behavior on what we know from the games and anime. In terms of plot, you could create a conflict such as Pikachu being separated from the trainer. Develop the story gradually, with each chapter building on the last. Add details about the Pokemon battles, the scenery, and the relationships between the characters to make it engaging.
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.