In an 'Ash into Mewtwo' fanfic, one aspect could be the change in relationships. His Pokémon might not recognize him at first, and he'd have to find a way to communicate and regain their trust. Also, trainers like Misty and Brock would be shocked. The fanfic could delve into how Ash tries to convince them that he's still the same person inside, just in a different form.
Well, one way is through shared dreams. Mewtwo could enter Ash's dreams and they could communicate on a deeper level there. This would be a very unique way to develop their relationship as it's not a typical form of interaction. Ash could learn more about Mewtwo's fears and hopes in these dream encounters.
The relationship could start with mutual respect. Ash respects Mewtwo's power and intelligence, and Mewtwo respects Ash's courage. Then, through shared experiences like helping other Pokémon in need, they start to trust each other more. This trust can then turn into a deeper emotional connection.
A possible plot for an 'Ash into Mewtwo' fanfic is that the transformation is a result of a wish granted by a magical Pokémon. Ash, now in Mewtwo's body, decides to use this opportunity to understand Mewtwo better. He travels to the places Mewtwo has been, meets the Pokémon Mewtwo has interacted with, and tries to solve the mysteries surrounding Mewtwo's creation. Along the way, he also has to face the consequences of having such a powerful form, like being hunted by Team Rocket who want to use him for their evil plans.
One common theme is friendship. Despite their differences, Mewtwo and Ash often form a deep bond of friendship in fanfics. Another theme is redemption. Mewtwo, with its troubled past, may find redemption through its relationship with Ash. Also, adventure is a popular theme. They go on various adventures together, facing challenges and growing closer as a result.
Well, friendship is a very common theme. Despite their differences, Ash and Mewtwo form a friendship in these fics. It's about how two very different beings can come together and support each other. Another theme is growth. Both Ash and Mewtwo grow as characters through their interactions. Ash might become more aware of the complex nature of Pokemon like Mewtwo, and Mewtwo might learn about the beauty of the world and relationships, which is often beautifully portrayed in 'ash x mewtwo fanfic'.
A theme that often comes up is the reaction of others. His friends, like Pikachu and Misty, might be shocked or scared at first when they see Ash as Mewtwo. Also, there's the theme of adaptation. Ash has to adapt to his new form, which may be very different physically and mentally from his original self. For example, he might have to get used to Mewtwo's telepathic abilities and the way he moves.
Perhaps in the fanfic, a new and mysterious Pokémon arrives. This Pokémon is able to manipulate the thoughts of those around it. It makes Mewtwo believe that Ash is a threat to all Pokémon. So Mewtwo starts to act against Ash. Ash, on the other hand, is clueless as to why Mewtwo has suddenly turned on him. He has to dig deep into the secrets of this new Pokémon and find a way to reverse what it has done to Mewtwo.
One possible motive could be that Mewtwo sees Ash as a threat to its own power or freedom. Ash is constantly on a journey to catch and train Pokémon, and Mewtwo, being a powerful and intelligent Pokémon, might view Ash's actions as a potential danger to its kind or its own existence.