The legendary Pokemon that the protagonist may interact with can also be very popular characters. For instance, if the story involves a close relationship with Arceus, that character would be highly regarded. Arceus being the creator of the Pokemon universe has a lot of mystery and power associated with it, and seeing how it interacts with the reincarnated character can be really exciting for readers.
Trainer characters who are friends or rivals to the reincarnated protagonist can also be popular. They add depth to the story by providing different perspectives on the Pokemon world. Their own goals and dreams, whether it's to become a Pokemon master or to research Pokemon behavior, can create interesting storylines when they cross paths with the main character who has a unique reincarnated perspective.
Pikachu is often a popular choice. It's one of the most well - known Pokemon, and being reincarnated as Pikachu gives a lot of opportunities for fun and action - packed stories. Its electric powers and cute appearance make it appealing.
Ash is often a popular character in these fanfictions. Since he's such a well - known Pokemon trainer in the original series, when someone is reincarnated, they might interact with him in interesting ways. Another popular character could be Pikachu. If the protagonist is reincarnated as a Pokemon, Pikachu is a common choice for a friend or rival. And of course, the various legendary Pokemon like Arceus or Lugia can also be central characters in these stories, as their power and mystery are very appealing.
In these fanfics, Pikachu is without a doubt one of the most popular characters. Its popularity in the main Pokemon series carries over here. It can be written as being curious, mischievous, or even a bit scared in different situations. Next, Psyduck is also quite popular. Its confused nature makes for some hilarious reaction - based scenarios. And who can forget about Jigglypuff? When it gets angry because no one is listening to its song in the fanfic, it creates really engaging and funny storylines.
The protagonist who is reincarnated as Harry Potter is obviously very popular. Readers are interested in how they navigate the world with their new - but also familiar - identity. Hermione Granger is also popular as she often has interesting interactions with the reincarnated character. Her intelligence and strong - willed nature make her a great character to include in these fanfics.
Obviously, Spider - Man himself is always popular. His new incarnation in the fanfic, with whatever unique twists the author gives him, is a central focus.
Rimuru Tempest is an obvious choice as he is the main character in the original series. He has a lot of potential for further development in fanfics. Veldora is also popular. His powerful dragon form and his comical personality can add a lot of fun elements to the story. And Shizu, her backstory and connection to Rimuru make her a great character to include.
Batman is quite popular. Reincarnating as him gives the character a chance to have all his gadgets and detective skills. Also, Superman is a common choice. Having his superpowers and being able to fly around Metropolis would be exciting. Wonder Woman is another one. Her connection to the Amazonian culture and her superhuman abilities make for great fanfiction material.
The main character from the Pokemon Black and White games, Hilbert or Hilda, are also quite popular. Fanfic writers like to expand on their adventures in Unova, give them new challenges and relationships. Also, characters like Team Plasma members are popular as they can be portrayed in different ways, either as villains with more depth or even as characters who have a change of heart in the fanfic.
Red, the main protagonist from the Pokemon Red game, is often very popular in fanfics. He is usually portrayed as a strong and determined trainer.
Snorlax is often a popular character in Pokemon Sumo fanfic. Its large size gives it an obvious advantage in sumo - style battles. Another one could be Machamp with its four strong arms. It can use its strength and multiple limbs to outmaneuver opponents.