A major theme is the combination of magic and ninjutsu. Since both Naruto and Harry Potter have their own forms of magic, in yaoi fanfiction, seeing how these magical elements blend in the context of relationships is common. There's also the theme of acceptance. The characters may have to deal with the fact that their yaoi relationships are different from what is considered normal in their respective worlds. And the theme of adventure often comes in, as they go through various challenges together in a relationship that spans two very different fictional settings.
One common theme is the clash and combination of different powers. Harry has magic from the wizarding world and Naruto has chakra - based ninja abilities. Another theme is the exploration of different cultures. The wizarding culture of Harry Potter and the ninja culture of Naruto are quite distinct. And of course, the yaoi theme focuses on the romantic relationship between male characters from the two series.
One common theme is the exploration of forbidden love. In the Harry Potter world, there are strict social and magical rules, and yaoi fanfiction often plays with the idea of characters defying those norms for love. Another theme is the discovery of self - identity. Characters may struggle with their feelings towards the same sex while also dealing with their identity as a wizard or witch.
Well, a frequent theme is the exploration of opposites. Harry is the symbol of good and Voldemort of evil in the original story. In yaoi fanfiction, writers often play with this dichotomy, seeing how these two extreme characters could come together. Also, there's often a theme of secrecy and forbidden love, as their relationship would be frowned upon in the wizarding world.
Since I don't encourage or promote inappropriate content, let's consider general Naruto fanfiction themes instead. Common themes include friendship, like Naruto's bond with Sasuke. Another is the pursuit of power, as seen with characters training hard to become stronger. And of course, the idea of protecting the village is also a major theme throughout the Naruto series.
There's 'NaruHarry: Cross - World Connection'. This fanfiction explores how Naruto and Harry meet through some sort of magical or interdimensional event. It shows their growth together as they face challenges from both the wizarding world and the ninja world, with their relationship at the center of the story.
One common theme is the struggle against prejudice. In the Harry Potter universe, werewolves are often discriminated against. In yaoi fanfiction involving them and other characters, they might face additional challenges due to their non - traditional relationship. Another theme is the power of love and acceptance. The stories often show how the characters' love for each other helps them overcome the difficulties.
Often, you'll see themes of friendship turning into something more. Since both Harry and Peter are used to having strong friendships in their own stories. Also, the idea of protecting each other in their respective dangerous worlds can be a theme. They both face threats, and in fanfiction, they might protect one another in unique ways that bring them closer together. There could also be themes related to identity, as they both have secret identities in a way. Harry is a wizard in a Muggle world, and Peter is Spider - Man in his normal life.
One common theme could be the exploration of the relationship between the human (from Harry Potter world) and the creature. It often involves how they overcome the differences between them, like cultural differences if the creature has its own society in the fanfic.
Often, there's the theme of adaptation. How the characters from Harry Potter, who are used to a world of spells and potions, adapt to the mechanical and technological world of Transformers. And vice versa for the Transformers characters in the magical world. In terms of the yaoi aspect, themes of love and attraction between male characters from the two different universes are common. It might also include themes of acceptance, as these relationships might not be the norm in either of the original universes.
One common theme is the exploration of an unlikely relationship. Since Harry Potter and a Beast character come from different worlds in a sense, their relationship development is often a central theme.