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.
Team Rocket might also show up. They're always after rare and powerful Pokémon. In this fanfiction, they could try to capture Mew when they find out about Ash's connection to it. This would lead to some comical and action - filled scenes as Ash tries to protect Mew from them.
There could be other trainers as well. For example, some of Ash's friends like Brock and Misty might be in the story. They could either help Ash in his new adventure with Mew or be a bit skeptical about the whole thing at first, thinking it might be too dangerous for Ash to be involved with Mew.
Perhaps it would be a combination of forces that save Ash. His own Pokémon, led by Pikachu, could start the rescue mission. Along the way, they might encounter some friendly Pokémon trainers who offer their help. And there could also be some unexpected help from a Pokémon that Mew least expects. This Pokémon could have some sort of connection to Mew and be able to convince it to let Ash go or help Ash escape while Mew is distracted.
In fanfiction, the relationship between Ash and Female Mew can be very interesting. It often involves unique storylines where Ash might encounter Mew in a different context than in the original Pokémon series. For example, the fanfiction could explore how Ash's adventures change when he has a special bond with Female Mew. Maybe they go on a journey together to discover new Pokémon or face a powerful enemy that only they can defeat as a team. This relationship in fanfiction can bring out different aspects of Ash's character, such as his compassion and determination in a new light.
Obviously, Ash is one of the main characters. He is the protagonist who is on the mission to catch Mew.
Maybe in the fanfic, a mad scientist creates a device that accidentally swaps Ash's essence with Mew's. As Mew - in Ash's body - Ash has to figure out how to reverse the process while also dealing with Team Rocket, who notice something very strange about 'Ash'. Meanwhile, the real Ash, in Mew's form, tries to use Mew's abilities to stop the scientist from causing more chaos.
Often, it starts with Ash being in awe of Mew's rarity and power. Mew, seeing Ash's pure heart, decides to approach him. Then they start to trust each other more as they face challenges together, like saving a group of Pokemon from a natural disaster.
The main character is surely Ash. He is the one who is being betrayed. Mew is another important one. It might be that Mew is the cause, directly or indirectly, of Ash's betrayal. Then, Ash's Pokémon partners are likely to be main characters too. They might be confused or forced to side against Ash. And there could be some antagonists in the story, perhaps some evil trainers or organizations who are behind the plot to make Ash look bad and get betrayed.
Well, if Ash were to turn into Mew in a fanfiction, it would be quite a wild turn of events. Mew is known for its ability to transform and its vast psychic capabilities. Ash, with his new form, could potentially travel to different dimensions that were previously inaccessible. He could also communicate with Pokémon in a whole new way, using Mew's psychic powers to understand their deepest thoughts and feelings.
There are indeed some. In these fanfictions, Mew might be portrayed as a special Pokemon that has a deep bond with Ash. It could be in a way where Mew helps Ash in his Pokemon journey in unexpected ways. For example, Mew might use its psychic powers to communicate with Ash's other Pokemon to make them stronger or understand Ash better. Some fanfictions also create a backstory for how Mew and Ash first met, which can be really interesting to read.
Perhaps in this fanfiction, Ash discovers that he has a deeper connection to Mew than he ever thought. It could involve Mew choosing Ash as a special trainer to carry out a very important mission in the Pokémon world, such as saving a certain region from a new and powerful threat. This would lead Ash to face many challenges and grow in ways he hasn't before.
One common theme is friendship. Ash and Mew often form a special bond in these fanfictions, like in 'The Friendship of Ash and Mew' where they rely on each other to overcome difficulties. Another theme is adventure. They go on various quests together, exploring new places and encountering different Pokémon.