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.
Darth Vader would likely be conflicted. On one hand, he could see the potential in his younger self to become a powerful Sith. On the other hand, he might be reminded of his own lost innocence. He might give his younger self some warnings about the path he is about to take, but also encourage the dark journey.
There's a fanfic titled 'Vader's Redemption'. In this story, Vader starts to question his loyalty to the Emperor much sooner, especially after some profound encounters with Luke. It's a great read as it shows the internal struggle of Vader while also exploring the bond between father and son in a new light. It's full of action-packed scenes and deep emotional moments.
Darth Vader was once Anakin Skywalker, a Jedi with great potential. But he was lured to the dark side by Palpatine. He became a Sith Lord. Vader was a fearsome figure in a black suit with a red lightsaber. He carried out the Emperor's evil commands, like hunting down Jedi. However, in the end, he redeemed himself by saving his son, Luke Skywalker, from the Emperor's wrath at the cost of his own life.
Darth Vader was once Anakin Skywalker, a Jedi with great potential. He was lured to the dark side by Palpatine. His fall was tragic. He became a Sith Lord, a powerful enforcer for the Empire. He wore the iconic black suit and had a menacing presence. He was involved in many battles, like the destruction of Alderaan. In the end, he redeemed himself by saving his son, Luke Skywalker.
In a fanfiction scenario, Darth Vader time traveling to the Clone Wars could also lead to some interesting battles. He might bring with him advanced technology or fighting techniques from the future. This could make him a formidable force on the battlefield. He could face off against some of the great Jedi of that era in new and unexpected ways, changing the dynamics of combat and potentially leading to different outcomes for various battles.
Well, a really good fanfiction is 'Darth Vader: Clone Wars Origins'. It gives a unique perspective on how Vader's character might have developed during the Clone Wars. It has some great action scenes and explores his relationship with other key characters like Palpatine. Another one to check out is 'Vader in the Clone Wars: The Untold Story'. This fanfic fills in some gaps in the official story and shows Vader's influence on the events of the Clone Wars in a different light. And then there's 'Clone Wars: Vader's Redemption', which takes a more speculative approach to Vader's character and his potential for change during the Clone Wars.
One interesting female Darth Vader fanfiction is 'The Empress of the Sith'. It reimagines Vader as a female character and delves into her rise within the Sith order. The story has great character development and some intense lightsaber battles.