Well, a popular theme is the exploration of dark magic. In adult fanfiction, it might not be as straightforward as in the original books. Writers could delve into how characters are tempted by dark magic, or how they resist it in more complex ways. There's also the theme of romantic relationships between secondary characters. For instance, Neville and Luna could have a more in - depth relationship story. And then there's the theme of magical education reform. How could the Hogwarts curriculum be changed to better prepare students for the real wizarding world?
One popular theme could be alternative universes where the characters have different careers or relationships. For example, Hermione might be a famous wizarding world historian and her relationship with Ron or Harry could be explored in a new light. Another theme could be post - war Hogwarts, showing how the characters deal with the aftermath of the battle and how it changes their lives. And sometimes, there are themes about the characters' family backgrounds and how that influences their actions in the wizarding world.
Some common themes include time - travel. In HP adult fanfiction, this can be used to change certain events in the wizarding world's history. It often involves characters like Hermione using her intelligence to manipulate time. Another theme is magical creature lore. Writers might explore how the characters interact with more dangerous or rare magical creatures, like thestrals or basilisks, in new and unexpected ways. Also, there are themes related to the political structure of the wizarding world, like the Ministry of Magic's inner workings and how characters get involved in it.