Luke's character development in such a fanfiction would be complex. Initially, he would be full of defiance towards Vader, but as the captivity continues, he might start to feel a sense of hopelessness. However, this would also be a time for self - discovery. He could learn to control his emotions better, as any outburst could be used against him by Vader. His view of the Force could also expand. He may come to realize that the power of the Force is not just about combat but also about inner peace and understanding. And through his interactions with Vader, he might develop a stronger sense of purpose in his journey as a Jedi, vowing to not let the dark side overtake him or others.
In fanfiction, if Luke and Leia were captured by Vader, one possible scenario could be that Vader tries to turn them to the dark side. He might use his knowledge of their true parentage as a tool, revealing it in a way that shakes their beliefs. Maybe he offers them power and a place by his side in ruling the galaxy.
The relationship could develop in a complex way. Since Vader has captured Luke, there's a power imbalance. However, as they interact, Luke might try to reach out to the good in Vader. Vader, in turn, might be conflicted. He could start to protect Luke from the Emperor's harsher plans, leading to a strange alliance within the captivity.
They could use the Force to overpower their captors. Luke is quite strong in the Force and together with Leia, they might be able to create a distraction and break free.
If Darth Vader travels to a time when he was still Anakin Skywalker, he might have a chance to redeem himself earlier. Seeing his younger self could make him realize the mistakes he made and try to change the path that led to his dark transformation. His character could become more complex as he battles with his past self's idealism and his current self's dark nature.
In fanfiction, their relationship could develop more quickly towards mutual understanding. Maybe Luke could convince Vader to turn away from the dark side much earlier, and they could start training together as Jedi. This would be a huge shift from the original story.
Well, in a fanfiction where Luke is captured by Vader, there might be a plot where Vader tries to make Luke his apprentice in a more psychological way. He could isolate Luke and feed him false information about the Jedi and the Rebellion. Luke, on the other hand, might resist by connecting with the Force in new and unexpected ways. Maybe he manages to communicate with other Jedi spirits who guide him through the tough situation. And, there could be a sub - plot where Luke's friends are trying to rescue him, leading to an exciting showdown between the Rebels and Vader's forces.
Naruto's character would experience a significant transformation. He'd be exposed to a whole new level of power and control in Vader's world. His development could go in different directions. He could either become more like Vader, ruthless and power - hungry, which would be a huge deviation from his original self. Or he could use the knowledge he gains to become a stronger defender of what he believes in. He might also learn to be more strategic and less impulsive, as the Star Wars universe demands a different kind of thinking compared to the ninja world he comes from. His relationships would also change, as he'd have to interact with different species and characters in the Star Wars setting, and these new relationships would shape his character further.
Their relationship could develop uniquely if Darth Vader starts to have dreams about Baby Luke's future as a great Jedi. These dreams make him question his loyalty to the dark side. So he begins to secretly guide Luke in the ways of the Force, like leaving behind ancient Jedi texts for the baby to find when he's older.
In such a fanfiction, Harry would grow in his understanding of the dark side of magic. Being captured by Voldemort means being exposed to the darkest and most malevolent forms of magic. This would make him more cautious in his own use of magic, but also more knowledgeable about how to counter dark magic. His character would also become more patient. He can't rush into things as he is in a very dangerous situation. He has to bide his time, wait for the right moment to escape or fight back. This new - found patience would be a valuable asset in his future battles against Voldemort. Moreover, he would develop a stronger sense of self - identity. He would be constantly reminded of who he is and what he stands for in the face of Voldemort's attempts to break him.
Luke joining the Empire in a fanfic would be a huge shift for his character. His naivete might be exploited by the Empire. He could be made to believe that the Empire's way was the only way to bring order to the galaxy. As he got more involved, he'd see the atrocities committed by the Empire. This would cause him to reevaluate his decision. His character development would then be about redemption, trying to make up for the wrongs he'd done while with the Empire. He might even try to use his position within the Empire to undermine it from the inside, which would be a very different kind of hero's journey from what we're used to in the Star Wars franchise.