Pikachu's Pokémon friends could also be main characters. For example, Pikachu's best friend, a Squirtle, could be there to offer moral support. It could bring little gifts like small shiny stones to cheer Pikachu up during the pregnancy and be there when the baby is born.
One possible plot could be that Pikachu is in a Pokémon center being cared for by Nurse Joy. The other Pokémon in the center are all very excited and protective. Pikachu's trainer is by its side, constantly reassuring it. As the time for giving birth approaches, Pikachu becomes a bit nervous but also shows great determination. Finally, it gives birth to a cute little Pichu.
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.
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.
Well, clearly Ash and Pikachu are the main characters. Ash is the Pokémon trainer and Pikachu is his trusty and most well - known Pokémon companion. They are the central focus in any such fanfiction as their relationship is at the heart of the Pokémon series.
Well, clearly Ash and Pikachu are the main characters. Ash is the trainer and Pikachu is his beloved Pokémon partner. They are the core of the story and most of the events revolve around their relationship and their adventures together.
An ancient and powerful Pokémon with the ability to influence Pikachu's mind could be the antagonist. It might see Pikachu's potential and wants to use it for its own dark purposes. By making Pikachu leave Ash, it can start to manipulate Pikachu more easily.
Team Rocket could still be the main antagonists. They might see Ash as Pikachu and think it's a new, rare Pikachu. So they try to capture him more desperately than ever. They could have some new gadgets designed specifically to catch this 'strange' Pikachu which is actually Ash.
It could be a dark wizard who wants to capture Pikachu for its powerful electric abilities. He might plan to use Pikachu's electricity to power some sort of dark magic device.
It could be a mad scientist. The scientist has been researching ways to combine organic and electrical energy. He sees Pikachu as the perfect specimen and Samus as someone who will try to stop his unethical experiments. So he sets out to capture Pikachu and eliminate Samus.
It could be a Pokemon itself. Maybe a dark - type Pokemon with a grudge against humans and Pikachu in particular. This Pokemon could be using its powers to cause chaos in the city, and Pikachu has to figure out its motives and stop it before it's too late.