His character could develop a more gentle side. Mew is often associated with kindness and playfulness. As Ash becomes a Mew fan, he might start to exhibit these traits more. For example, he could be more patient with his other Pokémon and more understanding of their needs, rather than just focusing on winning battles.
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.
One possible plot could be that Ash has a strange encounter with a Mew. Maybe he discovers a hidden power within himself that is related to Mew. This new power could attract Mew to him, and they form an unexpected bond. Ash then has to learn to control this new power while also facing challenges from other trainers who are jealous of his newfound connection with the rare Pokémon Mew.
At first, Ash might be in awe of Mew. He has heard so much about this rare and powerful Pokémon. Mew, on the other hand, would be curious about Ash's determination and his bond with his Pokémon. As they spend time together, Ash would start to learn from Mew's unique abilities and wisdom. Mew might show Ash how to communicate better with his Pokémon on a deeper level. Their relationship could develop into a sort of mentorship, with Mew guiding Ash in his Pokémon training journey.
Mew often interacts with Ash in a very friendly and helpful way. Since Mew is a very powerful and intelligent Pokémon, it might guide Ash in his journey. For example, it could show Ash shortcuts to new Pokémon areas or give him advice on how to handle difficult Pokémon battles.
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.
As a Mew fan, Ash might start to study different aspects of Pokémon lore more deeply. This could make him wiser in the ways of Pokémon. He could also develop a more empathetic side towards Mew - like Pokémon, seeing them as not just creatures to battle with but also as beings with their own unique qualities and stories.
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.
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.
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.
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.