Aside from the Pokémon characters, there can be some human characters who live in the Pokémon world. They could be researchers who are interested in baby Mew. They study its behavior and abilities, which sometimes puts baby Mew in a bit of a tricky situation, but also helps it grow and understand more about itself.
Well, obviously baby Mew itself is a common character. There are often other Pokémon characters like Pikachu. Pikachu might be a friend or a protector to baby Mew in the fanfiction. Another common character could be a Pokémon trainer. The trainer might find baby Mew and take it under their wing.
Ichigo is often very popular. Her transformation into a Mew Mew and her strong - willed personality make her a favorite. She's the main character, so she's usually at the center of many fanfiction stories, whether it's about her relationships with the other Mew Mews or her battles against the aliens.
There could be a mentor figure, someone who helps her understand and control her mew mew power. This character might be an older person with some knowledge of such powers.
In this type of fanfiction, Sasuke could be one of the most popular characters. His cool and brooding nature would contrast with the more light - hearted Mew Mew characters. Also, characters like Ryou from Mew Mew Power, who has a bit of mystery to him, might attract a lot of attention. The combination of his knowledge of the Mew Mew world and his interactions with Naruto characters could make for some engaging storylines. And Naruto's friends like Shikamaru might also be popular as his laid - back yet intelligent personality could add a different flavor to the crossovers.
Pikachu would most likely be there. Since Pikachu is Ash's closest companion, it would be involved in any story related to Ash. Maybe Pikachu could also have some sort of interaction with Mew, like being a bit jealous at first of Ash's new connection with Mew.
Obviously, baby Rosalina herself is the main character. There might also be her mother or caretaker in some fanfictions. And sometimes, there could be other baby versions of well - known space - related characters like baby Mario or baby Luigi who interact with her.
Obviously, Mikey himself as a baby is a central character. His family members often play important roles too. For instance, his older brothers or sisters who might protect him or play with him.
Obviously, baby Quasimodo himself is a central character. Then there's Frollo, who plays a significant role in Quasimodo's life in the original story and would also be important in fanfiction about his baby days.
The baby metroid itself can be considered a central 'character' in its own right. It has its own behaviors and reactions that can influence the other characters around it. For example, its need for energy or its growth spurts might force the other characters to make certain decisions. And of course, there may be characters from the Metroid universe's background lore that show up to interact with the baby metroid situation, like the Chozo who have a connection to the Metroids in the official lore.
In 'bella as a baby fanfiction', apart from Bella and her immediate family, there could be characters who have a special connection to Bella's future self. Maybe there's an old wise woman in the neighborhood who somehow senses that this baby will grow up to be someone special. So she starts to protect Bella from an early age, becoming an important character in the story. And also, if it's set in a particular fictional universe, there could be some creatures or beings that are drawn to Bella because of her unique presence even as a baby.
Zoey (Mew Zoey) is often quite popular in fanfic. Her leadership skills and strong character make her an interesting focus. Fans like to explore her relationships with the other Mew Mews more deeply and might write stories about her facing challenges alone or making tough decisions for the team.