One common theme is the idea of acceptance. Since their relationship is rather unusual in the Pokemon universe, the fanfictions often focus on how they accept each other for who they are. For example, Ash accepts Mewtwo's power and complex nature, and Mewtwo accepts Ash's simple yet strong-hearted personality.
Another theme is the power of friendship evolving into love. Usually, Ash first befriends Mewtwo, and through their shared experiences, like fighting against common enemies or exploring new regions, that friendship blossoms into something deeper. This is seen in many fanfictions where they gradually realize their feelings for each other are more than just platonic.
Overcoming differences is also a prevalent theme. Ash is a human and Mewtwo is a powerful Pokemon. Their different natures, abilities, and life expectancies are often explored in these fanfictions. They have to work through these differences to be together, and this struggle and how they overcome it is a major part of many of the stories.
A common theme is the exploration of power. As Ash becomes Mewtwo, he has to deal with a great amount of power that he's not used to. Another theme is identity. He has to figure out who he is now that he's no longer the regular Ash. Also, friendship is often a theme. His friends may have different reactions to his transformation, and he has to navigate those relationships.
One common theme is friendship. Despite their differences, Ash and Mewtwo often form a deep friendship in fanfictions. For example, they might support each other through tough battles or personal crises.
Adventure is also a big theme. They go on various quests together, exploring new regions and facing different Pokemon. Sometimes, the theme of redemption also appears, especially if the fanfiction is set around a 'bad' Mewtwo that is redeemed through its interactions with Ash and Lillie.
One common theme is the exploration of an unorthodox bond. Given that Mewtwo is a genetically - created Pokémon and Ash is a regular human trainer, their relationship in yaoi fanfiction can be a study in contrast and connection.
One common theme is the power dynamic. Since Mewtwo is such a powerful Pokémon and Ash is a determined trainer, exploring how they interact with that difference in power is popular. For example, Mewtwo might initially be dismissive of Ash but then come to respect him.
Well, often there is the theme of the power dynamic. Since Mewtwo is so powerful, how does that play into their relationship with Ash? Also, the theme of discovery is common. They discover new things about each other, like Mewtwo learning about Ash's unwavering determination, and Ash learning about Mewtwo's complex thoughts and feelings. It's also about breaking barriers, as they come from very different 'worlds' in a sense.
A common theme is the power of friendship evolving into something more. Since Ash has a history of befriending Pokémon, with Mewtwo it could be taken to the next level romantically. Another theme could be the breaking of boundaries, as a human - Pokémon relationship like this goes against the norm in the Pokémon universe.
One common theme is the exploration of trust. When Ash and Mewtwo's relationship is broken by the idea of betrayal, it makes the reader think about how fragile trust can be. Another theme could be redemption. If Mewtwo has been made to betray Ash against its will, the story might focus on how it tries to make amends.
Themes can vary widely. However, the concept of trust is often explored. How does Ash gain Mewtwo's trust? It could be through his actions in battles, his respect for Pokémon, or his ability to see Mewtwo not just as a powerful entity but as a being with feelings. Additionally, the theme of the underdog (Ash) facing the seemingly unbeatable (Mewtwo) is quite prevalent. It makes for an exciting narrative as we see Ash use his wits and heart to achieve the seemingly impossible task of catching Mewtwo.
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'.