Another way is through a connection with his past. Maybe he discovers something about his family, like an heirloom or a hidden message from Padmé. This rekindles his humanity and makes him want to turn away from the dark side. He then uses his skills and power to fight for the right causes, like protecting the innocent and overthrowing the Emperor.
Yes, in some fanfics, C3PO might recognise Darth Vader. C3PO is a protocol droid with a vast knowledge database. If the fanfic adheres to the basic Star Wars lore, C3PO would likely be aware of Vader's identity and his importance in the Galactic Empire. However, the nature of fanfics allows for a lot of creative liberties, so there could also be scenarios where C3PO's recognition of Vader is altered or not as straightforward due to some unique plot twists or alternate universe settings.
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.
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.
One of the best Darth Vader stories is his origin as Anakin Skywalker in 'The Phantom Menace'. We see his discovery as a young slave with extraordinary Force abilities. Another great one is in 'Revenge of the Sith' where his fall to the dark side is fully realized. It shows his complex relationship with Padmé and his struggle with the Jedi Council.
One of the best Darth Vader novels is 'Lords of the Sith'. It really delves into the relationship between Darth Vader and Emperor Palpatine. It shows their power dynamics and Vader's complex feelings towards his master. Another great one is 'Darth Vader: Dark Lord of the Sith'. This novel explores Vader's early days as a Sith, his training, and his internal struggles as he fully embraces the dark side.
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.
The rise of Darth Vader was a complex process. His own internal struggle was a major part. Anakin was a very powerful Jedi, but he had a lot of emotional turmoil. His love for Padmé was so strong that it became a weakness that Palpatine could exploit. Also, the Jedi Order's rigidity contributed. They had strict rules and were slow to adapt. Anakin, who was full of passion and different ideas, felt restricted. This, combined with the external influence of Palpatine and the overall situation in the galaxy during the Clone Wars, ultimately led to his transformation into Darth Vader.