One common theme is the battle between good and evil. Both Harry Potter and Buffy are all about fighting against dark forces. In fanfiction, this often means combining the Death Eaters or Voldemort from Harry Potter with the vampires, demons and other baddies from Buffy's world.
Another theme is the discovery of self - identity. Just as Harry learns about his role as 'The Boy Who Lived' and Buffy comes to terms with being the Slayer, in fanfiction characters from both series often have to re - evaluate who they are when their worlds collide. For example, a Hogwarts student might find they have some slayer - like abilities in a crossover story.
Power and responsibility is also a big theme. Both Harry and Buffy have a great deal of power, Harry as a wizard and Buffy as a slayer. In the fanfiction, they often have to grapple with how to use their power in the right way, especially when they are in an unfamiliar situation like when Buffy is in the wizarding world or Harry is in Sunnydale.
One common theme is the clash of different magical systems. Harry Potter's magic is more structured and based on spells and wands, while Buffy deals with more instinctive and primal supernatural powers. When these two worlds collide in fanfiction, exploring how they interact and conflict is a big theme.
One common theme is the exploration of power. Since the 'Master of Death' concept involves a great deal of power, it's often about how the characters handle it. Another theme is crossover elements, like mixing the magic from 'Harry Potter' with the supernatural fighting in 'Buffy'.
A common theme is the battle between good and evil. In 'Harry Potter', Harry battles Voldemort; in 'Buffy', she fights vampires and other demons; and 'Morningstar' also has elements of this struggle. So in fanfiction, authors often create scenarios where characters from these different universes team up to fight a greater evil.
One common theme is the exploration of relationships. For example, romantic relationships between characters that were not fully explored in the original books, like the relationship between Harry and Hermione. Another theme is the expansion of the magical world, such as new spells or magical creatures. Also, there are fanfictions that focus on the backstories of minor characters, giving them more depth and significance.
Love and sacrifice are also prevalent themes. We see how the love of Lily Potter saved Harry in the original series, and fanfiction often expands on this idea of love being a powerful force. There are also fanfictions that explore the idea of redemption for characters like Draco Malfoy, showing that even those on the wrong side can have a chance at changing and making amends.
One common theme is adventure. Combining the action - packed world of 007 with the magical adventures of Harry Potter makes for some thrilling stories.
One common theme is the clash of different power systems. Naruto has its chakra and ninja techniques, while Buffy has her slayer powers. Fanfictions often explore how these powers interact when the characters meet. Another theme could be friendship. Characters from both universes might form unexpected friendships.
The exploration of their different cultural backgrounds is also a theme. Giles is from England with a very different upbringing compared to Buffy's American experience. Fanfictions might delve into how these differences play out in their relationship, whether it causes misunderstandings or brings them closer together. There are also fics that look at how they might interact in a more modern - day setting outside of the supernatural world, just as two people with a complex history trying to navigate normal life.
One common theme is redemption. Faith has done a lot of wrong things and many fanfictions focus on her journey to make up for her past actions. Another theme is the complex relationship between Buffy and Faith, whether it's a love - hate relationship or a growing understanding between them.