One main theme is the clash of different worlds. Harry Potter's magical world and Giratina's Pokémon world are very different, so when they come together, there's a lot of exploration about how their rules and cultures collide. Another theme could be friendship. If Harry befriends Giratina, it shows how friendship can transcend different species and realms. Also, power and its proper use. Giratina is a very powerful being, and in the fanfiction, it often has to do with how that power is harnessed in the context of the Harry Potter universe.
One interesting 'Harry Potter Giratina Fanfiction' could be 'The Encounter of Harry and Giratina'. In this fanfic, Harry stumbles upon Giratina during one of his adventures in the Forbidden Forest. Giratina, being a powerful and mysterious Pokémon, creates a whole new set of challenges and opportunities for Harry. It's a great read for those who like to see crossovers between different fictional universes.
One main theme is the clash of cultures. The magical and often more civilized world of Harry Potter against the wild and war - like Dothraki culture. For example, in many fanfics, the Dothraki's view on honor and combat is contrasted with the values of the wizarding world.
One main theme is the clash of different worlds. Harry Potter comes from a world of wizards and magic, while Klaus is from a world of vampires and werewolves. So, there's often a lot about how these two different worlds interact and how the characters adapt to each other's rules.
One main theme is the clash of different power systems. Since the Kyuubi has its own set of powers from the Naruto universe and Harry Potter has magic, seeing how they interact and sometimes clash is a big theme.
Survival is a big theme. Since it's set in a caveman - like setting, characters have to find ways to survive using both magic and basic instincts. For example, they might need to use magic to hunt for food or build shelters.
The idea of different cultures and races coming together is also a big theme. Just think about the various species in Dragonlance and the different student groups in Harry Potter. Fanfictions often explore how they would interact, cooperate or even conflict with each other.
Another theme is discovery. The characters are constantly discovering new things about each other's worlds. Lyra might discover the secrets of the Forbidden Forest in Hogwarts, and Harry might learn about the concept of Dust in Lyra's world. This theme of discovery adds an element of excitement and mystery to the fanfictions.
One main theme is redemption. Just like in the gospel, characters in Harry Potter might be shown finding redemption for their wrongdoings. Another could be the struggle between good and evil, which is central in both Harry Potter and gospel teachings.
One main theme is the clash of two different mythologies. The wizarding world of Harry Potter has its own set of rules and magic, and when combined with vampire lore, there can be a lot of interesting clashes. For example, how would vampire immortality compare to the long - lived wizards like Dumbledore? Another theme could be the idea of secrecy. Vampires are often secretive in their own lore, and in the Harry Potter world, there are many secrets as well.
One main theme could be the battle between good and evil. Just like in the original Harry Potter series, but with an exorcist twist. Another might be the exploration of the unknown and the supernatural. For instance, dealing with entities that are beyond the normal magical creatures in the Potterverse.