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.
In a Harry Potter Sith Apprentice fanfiction, it could be interesting if Voldemort somehow made a pact with the Sith. A young Death Eater could be chosen to be a Sith apprentice. This would give the Death Eater new powers and abilities. They could use the Sith's lightsaber skills in combination with their Dark Magic. The story could follow their journey as they try to bring the Sith's way of ruling through fear and the wizarding world's idea of pure - blood supremacy together, creating a more terrifying and powerful regime that both the Jedi and the Order of the Phoenix would have to face.
Well, perhaps a character who has always felt like an outcast at Hogwarts, like a Slytherin who is constantly looked down upon. This character could be approached by a Sith in disguise. As a Sith apprentice, they could learn to use the Force to enhance their already cunning Slytherin traits. For example, using mind tricks to manipulate other students, much like the Imperius Curse, but with a Sith twist. They could also start building their own army within the school, using a combination of Sith fear - inducing tactics and wizarding spells.
One idea could be an apprentice learning advanced potions from Snape. They might discover a new potion formula together. Another could be an apprentice in the art of defensive magic under Moody. They could learn unique spells and how to counter dark magic attacks.
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.
Well, an interesting plot could be that the apprentice is sent on a secret mission by Grindelwald. On this mission, they encounter a magical creature that has the power to change loyalties. This makes the apprentice question their place by Grindelwald's side. Also, the apprentice might find a hidden diary of an old wizard who was once in a similar position, and through reading it, they start to see the flaws in Grindelwald's plans.
One idea could be that the apprentice discovers a new type of wood with extraordinary magical properties. For example, a wood that can channel the magic of multiple elements at once. This could lead to a race among dark wizards to get their hands on wands made from this wood, and the apprentice has to protect the secret of its origin.
One idea could be an apprentice who discovers a long - lost spell that can bring inanimate objects to life in a very different way than the usual magic. For example, they make Hogwarts portraits come down and interact physically with students.
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 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.
A plot idea might be that Snape, in taking Harry as an apprentice, is actually trying to atone for his past mistakes. He trains Harry in a very strict but effective way, and they end up bonding over their shared experiences with Voldemort. Harry could learn how to better control his emotions and magic from Snape, which helps him in future battles.
Maybe Harry discovers that Voldemort has a hidden motive for taking him as an apprentice. It could be that Voldemort believes Harry has a power that can be harnessed for a greater, more complex plan that involves not just ruling the wizarding world but changing the very fabric of magic itself. Harry then has to figure out how to either use this to his advantage or stop Voldemort from achieving his goal.
In some 'Harry Potter Sith fanfiction', a plot twist could be that a seemingly good character is actually being influenced by Sith powers all along. For example, a teacher at Hogwarts who is secretly using Sith mind - control techniques on students to further their own dark agenda.