A new character could be introduced as a Sith Lord. Maybe a wizard who has been studying dark and forbidden magic from other dimensions. He could have a red lightsaber - like wand and use powers that combine magic and Sith - like abilities. For example, he could use mind control not just on muggles but also on some weak - willed wizards.
Well, first, Harry would need to study the ways of the Sith. He has to understand his enemy. Then, he could combine his wizarding skills with some new knowledge. For example, he might learn how to use his magic to counter the Sith's mind - control abilities. He could also use his Patronus, which represents hope and light, to drive away the darkness of the Sith. And of course, he'd need to find the Sith's weakness, like in the way he found Voldemort's Horcruxes.
Well, it's hard to say if it's popular. On one hand, some fans might be intrigued by the idea of mashing up the wizarding world of Harry Potter with the dark and powerful Sith Lords from Star Wars. They might be curious to see how the magic of Harry Potter could interact with the Force. However, many fans of both franchises might be purists and not be interested in this sort of crossover. So overall, it's probably not a widely popular fanfiction concept.
Well, if Harry Potter becomes a Sith Lord in fanfiction, it would be a total upheaval of his character. The Sith are all about power, domination, and the dark side of the Force. Harry, who was raised with love and values like friendship and loyalty, would have to completely abandon those. He'd probably start wearing Sith robes and have a red lightsaber. His spells would take on a more sinister edge, and Hogwarts would be in for a lot of trouble as he tries to assert his newfound Sith - like authority.
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.
The most interesting aspect could be the power dynamics. Harry Potter, as a wizard, has his own set of magical abilities. But as a Sith Lord, he would have access to the dark side of the Force. It would be fascinating to see how he balances or clashes these two different power sources. For example, would he use magic to enhance his Force abilities or vice versa?
One interesting concept could be a crossover where the magic of Harry Potter's world interacts with the Force in the Sith's domain. Maybe Harry discovers a hidden connection between his wizarding abilities and the dark side of the Force, leading to a struggle within himself as he's tempted by the power the Dark Lord of the Sith represents. Another concept could be a battle of ideologies, with the values of Hogwarts clashing against the Sith's teachings of power through domination.
The story would become much darker. Harry would no longer be the hero fighting for good. Instead, he'd be causing chaos and destruction. His friends would either try to save him or become his enemies.
You should look for how the self - inserted Sith Lord changes the existing relationships in the Harry Potter series. For instance, will they turn Harry to the dark side? Or how they interact with Dumbledore, who is a very powerful and wise character. The description of the Sith Lord's appearance and their unique Sith artifacts in the wizarding world is also interesting. Moreover, the story should have a good pacing, not too rushed when introducing the Sith Lord's backstory and powers, and not too slow in getting to the main action and conflicts.
If Harry Potter becomes a Sith in fanfiction, it would be a wild departure from his original character. He'd likely trade his Gryffindor values for the dark and power - hungry ways of the Sith. His magic could take on a more menacing form, and his relationships would be severely strained. For example, his friendship with Ron and Hermione might turn into enmity as he delved deeper into the dark side.