Here's a plot: There is a prophecy in the wizarding world that foretells the coming of a great dark force from another dimension, which is actually the Sith Empire. Harry Potter and his friends initially don't believe it, but as strange events start to occur, like dark magic being used in ways they've never seen before, they realize the threat is real. They then embark on a journey to find out more about the Sith Empire and try to stop it from invading their world. Along the way, they learn about the similarities and differences between their magic and the Sith's use of the Force.
One idea is that a young Sith apprentice gets lost in a magical portal and ends up in the Harry Potter universe. This apprentice then tries to find a way back to the Sith Empire while causing chaos in the wizarding world. Some wizards might be intrigued by the apprentice's dark powers and start to follow him, leading to a split in the wizarding community between those who support the Sith ways and those who oppose them.
One idea could be that a Sith Lord somehow infiltrates Hogwarts. Maybe he uses the Dark Arts in a way that the wizards have never seen before, creating chaos. Another could be a wizard being tempted by the Sith Lord's power and turning to the dark side, much like in Star Wars. They might start using their magic in cruel ways.
One idea could be a young wizard from Hogwarts being secretly recruited by a Sith Lord. Maybe they discover a hidden connection between the Dark Side of the Force and some of the darkest magic in the wizarding world, like the Unforgivable Curses. The wizard, as a Sith apprentice, could then start using Sith powers alongside magic, creating a whole new kind of chaos in both the Star Wars and Harry Potter universes.
Another plot could involve Harry building a magical business empire. He might start a potion - making business that uses ethical and sustainable methods of gathering ingredients. With Hermione's help in business management and Ron's knowledge of the wizarding market, they could grow the business into a large corporation, with branches in different magical communities, also providing jobs for underprivileged wizards and witches.
One idea could be exploring a different path for Neville Longbottom. Maybe in this fanfiction, he becomes the chosen one instead of Harry. He could discover a new type of magic that gives him an edge against Voldemort.
One interesting idea could be the clash of different magical and dark side elements. The Harry Potter universe has its own magic system, and the Sith from Star Wars bring a different kind of dark power. In a harem aspect, perhaps different female characters from both universes are brought together, each with their own skills and personalities, creating unique interactions and storylines.
One idea could be a story where a Sith Assassin somehow gets transported to the Harry Potter universe. Maybe they initially see it as a strange and weak world compared to their own, but then they discover the unique magic there. They could try to use their Sith powers to dominate, but find that the magic of Hogwarts and its defenders are not so easy to overcome.
One idea could be a crossover where a powerful Sith Sorcerer somehow finds his way into the Harry Potter universe. Maybe he's on a quest for a unique magical artifact that only exists in the wizarding world. He could start causing chaos, and the Hogwarts students have to figure out a way to stop him using both their magic and their knowledge of the wizarding world's secrets.
The concept of a Harry Potter and Sith Empire fanfiction is really exciting. We could see Harry Potter characters being trained in the ways of the Sith. Imagine Harry being tempted by the power of the dark side. He already has a connection to a powerful form of magic, and the Sith could see great potential in him. On the other hand, the Sith might face challenges in the wizarding world. For instance, the protective spells around Hogwarts could be a major obstacle for them. And the Ministry of Magic might initially not understand the threat of the Sith until it's too late.
Another idea is that the Sith Empire decides to use a new form of Sith magic during the Clone Wars. This magic starts to corrupt the planets it is used on, and the Jedi have to find a way to stop it. The story could show the different reactions of various species to this new threat. For example, some might be more susceptible to the corruption while others are more resistant. The Jedi would have to form alliances with these different species to combat the Sith Empire's new weapon. This would involve a lot of political maneuvering as well as physical battles. It could also explore the nature of the Force and how the Sith's use of it in this new way affects the balance.
Well, if Harry Potter becomes a Sith, he would likely be a very powerful one. He already has strong magical abilities, and adding the dark side powers of the Sith would make him extremely formidable. Maybe he could use the Force to enhance his spells, or create new and terrifying dark magic. He might also have a new look, with a Sith robe and a red lightsaber.