Yes, there might be. Fanfic websites like FanFiction.net or Archive of Our Own could potentially have such a fanfic. You can search for it using the relevant tags and keywords on these platforms.
Darth Vader could encounter advanced droids that have developed personalities and even some form of Force - like abilities in this future. These droids might be a new challenge for him as they are not like the droids he is used to dealing with in his own time. He may also meet future versions of his former allies or enemies, who have been reincarnated or cloned in some strange new way, with different personalities but still with a connection to their past selves.
In the 'naruto is like darth vader fanfiction', their journey of self - discovery could be seen as similar. Naruto has to constantly figure out his place in the ninja world and how to control his power. Darth Vader is on a journey of self - discovery too, as he grapples with his identity as Anakin Skywalker and his role as Darth Vader. They also have a sense of isolation in some ways. Naruto often feels alone in his struggles, and Darth Vader is isolated in his dark armor, cut off from his former self and many human connections.
Maybe Naruto gets transported to the Star Wars universe and somehow becomes like Darth Vader. He could start using the dark side of the Force while still having his ninja skills.
Darth Vader's new suit was a marvel of Sith engineering. It was darker, more menacing than ever. The black armor seemed to absorb all light around it. The red glow of his eyes was intensified, making him look even more terrifying. With his new suit, he moved with a newfound grace, his every step sending a shiver down the spines of those who beheld him. His new suit also had enhanced weaponry, a lightsaber that was more powerful and a wrist-mounted blaster that could take out multiple enemies at once.
Darth Vader could meet advanced droids that have personalities and abilities far beyond what he's used to. These droids might see him as a relic from a bygone era. He could also meet future scientists who are intrigued by his cybernetic enhancements and try to study him. Additionally, there's a chance he meets descendants of his former allies or enemies, which would create a complex web of relationships and interactions.
He might be shocked by the advanced technology. The Empire's weaponry would seem primitive compared to future tech. He could also be intrigued by the new forms of the Force if they had evolved.
Well, it's likely that there are bounty hunters. Since Vader often has need of their skills for certain tasks. They would be characters who are in it for the money but also fear Vader. And then there are the stormtroopers. They are a constant presence, following Vader's commands and being part of his military operations.