Power struggle is also a common theme. Moriarty is a very powerful character in his own right, and in the Harry Potter world, there are different levels of power. Fanfictions often explore how Moriarty would fit into this power structure, whether he would try to take over or form alliances. Another theme is the exploration of morality. The Harry Potter series has its own moral code, and when Moriarty enters the picture, it challenges and sometimes blurs that code.
A prevalent theme is the exploration of power dynamics. Moriarty, with his non - magical but highly intelligent mind, challenges the power structures in the wizarding world. He may form alliances with dark wizards or find ways to undermine the power of the Order of the Phoenix. There's also the theme of mystery and intrigue, as his presence always brings an air of uncertainty and the need for the Harry Potter characters to solve the 'Moriarty puzzle' in these fanfictions.
Power dynamics is a common theme. Moriarty is a very powerful and manipulative character, so seeing how the OC interacts with his power, whether they resist or are drawn to it, is often explored.
A common theme is the concept of a different reality. In these fanfictions, the world is different enough that a kiss between Sherlock and Moriarty is possible. It might also involve the theme of love as a form of madness. Since both characters are highly intelligent, their love or attraction, shown through a kiss, could be seen as a kind of insanity that defies logic.
Well, it would probably be a very different take on the Harry Potter universe. Moriarty might use Harry as a tool in his grand schemes. Maybe he'd make Harry into a sort of 'dark wizard' in training. However, Harry's own innate sense of good might constantly be at war with the teachings of Moriarty. It would be a battle between the dark influence of Moriarty and Harry's true nature.
One plotline could be Moriarty infiltrating Hogwarts as a new teacher. He could secretly be plotting to steal powerful magical artifacts while also manipulating the students and staff. Harry and his friends would start to notice strange things happening around the school and suspect the new teacher. Another could be that Moriarty teams up with Voldemort, combining their evil minds to take over both the wizarding world and the Muggle world. This would put Harry in an even more difficult situation as he has to face two powerful villains at once.
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 possible plot could be Moriarty trying to infiltrate the wizarding world of Harry Potter for his own business gains. Maybe he wants to get his hands on some magical artifacts to sell in the Muggle world. Another could be Harry Potter teaming up with Moriarty's intelligence to solve a mystery in the wizarding business world, like uncovering a plot to monopolize the sale of certain potions.
Another theme is the exploration of Moriarty's character. In crossover fanfics, we can see how he adapts to new environments and how his intelligence and villainy are portrayed in different universes. It's interesting to see how he interacts with characters who have different moral compasses and abilities.