Another theme is adaptation. He has to adapt to the new rules, cultures, and powers of the crossover world. For example, if it's a crossover with a magic - based world, Naruto has to learn how magic works and how to use it. This theme of adaptation makes for some interesting character development.
One common theme is redemption. Naruto, being banished, often has to prove himself all over again in the new crossovers, seeking redemption for whatever led to his banishment in the first place.
One common theme could be the clash of cultures. Naruto's ninja culture and the Pokemon trainer culture are very different. So exploring how characters adapt to this new culture they're exposed to is a theme.
In these types of fanfics, a frequent theme is the exaggeration of Sasuke's flaws. His actions might be blown out of proportion to justify his banishment. Also, there could be a theme of Naruto's superiority being emphasized, with the idea that he has the moral high ground and the power to make such a drastic decision regarding Sasuke. This can sometimes lead to a rather unbalanced view of the relationship between the two characters compared to the original Naruto series.
One common plot element could be Naruto being unjustly banished from the Hidden Leaf Village. Then, in the crossover aspect, he might end up in a different world or situation where he has to prove himself. Regarding Sasuke bashing, Sasuke could be portrayed as a villain or someone who betrays Naruto more severely than in the original story.
One common theme is the underdog story. The banished prodigy has to face many challenges alone and prove themselves. Another theme could be redemption. They might strive to regain their former status in the ninja world. Also, themes of friendship and loyalty often come up as they find new allies in their exile.
Conflict is a very common theme as well. There are often conflicts between Percy and the new characters he meets, either because of misunderstandings or because they have different goals. And there's also the overarching conflict of Percy trying to find a way back home or to reverse his banishment. This conflict drives the plot forward and keeps the story exciting.
One frequent theme is the exploration of different cultures. Naruto comes from a ninja - based feudal Japanese - inspired world, and Twilight has a more modern American - inspired setting. So, seeing how the characters interact with these different cultural elements is often explored. Also, themes of friendship and loyalty are carried over from Naruto and get mixed with the complex relationships in Twilight.
A significant theme in 'naruto mha crossover fanfic' is the exploration of different power structures. Naruto's world has a more traditional hierarchical power structure with villages and clans. In MHA, the power structure is based on hero agencies and schools. When these two worlds collide, the fanfic often explores how the characters from each world adapt to the other's power structure. This can lead to some really interesting story developments, like Naruto trying to understand the concept of hero rankings in MHA or MHA characters getting involved in the politics of Naruto's villages.
Friendship is also a big theme. Since both Ranma and Naruto value friendship highly in their original series, in the crossovers, they usually form a strong bond. They learn from each other's strengths and support each other in facing various challenges.
One common theme is the clash of cultures. The ninja way from Naruto and the vampire - werewolf society in Twilight are very different. So seeing how the characters from each side react to the other's way of life is often explored.