In these fan fictions, a frequent theme is the exploration of different cultures. The wizarding culture in Harry Potter and the Sith / Jedi culture in Star Wars. There's also the theme of technology vs. magic. Darth Vader comes from a highly technological universe, while Harry Potter is set in a more magical one. How these two elements interact can be a major theme. Additionally, the theme of loyalty is often explored, as both universes have strong concepts of loyalty - to friends, to a cause, etc.
Common themes include the idea of different forms of power. Harry has his magic, and Vader has the Force. So there could be a power struggle or an exchange of knowledge about their powers. Another theme is the idea of redemption. Since Vader had his redemption arc in Star Wars, some fan fictions might explore if he could have a similar arc in the Harry Potter universe. And of course, there's the theme of two different worlds colliding, which brings a lot of chaos and new possibilities for the story.
Yes, there are some out there. You can start by looking on fan - fiction websites like FanFiction.net or Archive of Our Own. Just search for 'Harry Potter Darth Vader' in their search bars and you'll find various stories that combine the two universes in really creative ways.
If it was a fanfiction like that, it would completely distort the perception of Harry Potter. Harry is a symbol of hope and light in his own universe, but if he was like Darth Vader, he'd be seen as a much darker and more menacing figure. As for Darth Vader, his iconic status as a Sith Lord might be diluted if his traits were randomly imposed on Harry Potter. It would be a very odd mash - up.
One common theme is redemption. Many stories explore the idea of Darth Vader being redeemed through the influence of a female character. Another theme is power struggle. Since Vader is a very powerful figure, female characters often find themselves in a power struggle with him or within his sphere of influence. And there's also the theme of family, as some fanfics create a family connection between Vader and a female character.
One common theme is the struggle with the dark side. It often shows how the character is slowly drawn to the power of the dark side and the internal conflict that comes with it.
The exploration of the Force is also a big theme. Sometimes, the Force itself is what heals Vader, either through a new understanding of it or a unique manifestation of its power. It could be that the Force heals his physical injuries as well as his broken spirit.
Power is a common theme. Vader's already immense power in the Star Wars universe gets juxtaposed with the powers in other fictional worlds he crosses into. For example, if he crosses into a world with magic, how does his Force - based power compare?
Power is a common theme. Female characters in these fanfics often strive for power, either in the shadow of Vader or against him. They might be inspired by his strength or seek to overcome it.
One common theme is redemption. Writers often explore the idea of Darth Vader being redeemed through his connection with Ahsoka. Another theme is the struggle between the light and dark side, as Ahsoka represents the light and Vader the dark. Also, the theme of broken relationships is present, given their past as master - apprentice.
In such a fanfiction, Harry Potter becoming a Darth Vader fan could lead to him adopting some of Vader's more authoritarian and decisive ways. He might start to use more forceful methods to deal with his enemies in the wizarding world, which would surely cause a stir among his friends and foes alike. For example, instead of relying solely on magic spells in a traditional way, he could be influenced by Vader's use of the Force and try to develop something similar in the magical realm.
It's the clash of cultures and power systems. Darth Vader comes from a world where the Force is central, and in Harry Potter, it's magic. The fanfics can explore how Vader's Sith training and his dark nature would play out in a world full of Hogwarts students and wizards. Also, his iconic look and menacing presence are so different from the typical Harry Potter characters, which makes for a really interesting contrast when he's interacting with them.