A game enthusiast could be the main character. They have a deep knowledge of Pokemon games, so when they are turned into a Pokemon, they can use their knowledge of types, moves, and strategies to their advantage. They might recognize certain areas in the Pokemon world from the games and try to find hidden secrets or items that could help them in their new form.
It could be an ordinary teenager. Teenagers are often the main characters in fanfiction because they can have relatable insecurities and a thirst for adventure. They might be a bit of a misfit in their own world and then find a new sense of purpose when they turn into a Pokemon.
Maybe a young scientist. Since they are used to observing and studying things, when they turn into a Pokemon, they can use their scientific knowledge to understand the Pokemon world better. For example, they could study the evolution process of Pokemon from the inside. They might also try to find a scientific explanation for why they turned into a Pokemon in the first place.
One possible plot could be a person suddenly wakes up in the Pokemon world as their favorite Pokemon. They then have to figure out how to survive in this new world, make friends with other Pokemon, and avoid being caught by trainers. Maybe they also discover they have some special abilities that are unique to them even among Pokemon.
It could be an ordinary person, like a college student. They are just going about their normal day when suddenly, they are turned into a gorilla. This would make for an interesting contrast between their normal life and the chaos that ensues when they become a gorilla.
The main character could be a talented pokemon stylist. They have a passion for making pokemon look their best with unique haircuts. They travel around different regions to learn new haircut techniques and to show off their skills on various pokemon.
It could be Ash. He's the classic Pokemon protagonist and has been through so many trials already. His will has been tested countless times, like when he faced the Elite Four or when he had to rescue his Pokemon from Team Rocket. In this fanfiction, he could face a new kind of test that really pushes his will to the limit.
A Pikachu could be a great main character. Pikachu is popular and has a lot of potential for character growth. It could start as a timid Pokemon but become a strong leader during the uprising.
It could be a scientist who is involved in the study of Pokemon genetics. While trying to understand the mechanics of evolution better, they accidentally stumble upon the new evolution and then become involved in the events that unfold as a result, both in the scientific and the trainer communities.
It could also be an experienced pokemon trainer who has seen a lot in their travels. After encountering a mirage pokemon by accident and realizing how different and powerful they are, they become determined to become the mastermind in the world of mirage pokemon. They use their existing pokemon training skills and knowledge to study these special pokemon, making them a formidable force in the fanfiction.
Squirtle. Squirtle is cute and friendly. If it adopted a human child, it could show the child the underwater world of Pokemon. The Squirtle could teach the child how to swim, and they could explore underwater caves together. It would be a really fun and light - hearted story with Squirtle as the main Pokemon.
It could be an ordinary person, like a young student who was always curious about the magical world of Faust Alicorns. Maybe they accidentally stumbled upon a magic spell or artifact that caused the transformation.
It could be one of the baby ponies themselves. Maybe the story could be told from their perspective as they experience the world in this new, baby - like state and how they interact with their friends and family who are now taking care of them.