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.
Luke's character would develop a darker side, not in terms of being evil, but in having to face the inner turmoil of his vampiric existence. He'd have to constantly fight the urge to feed, which could make him more empathetic towards those who struggle with their own inner demons. His relationships with other characters would change significantly. Han and Leia might be hesitant to trust him at first, but as he proves himself, they'd come to accept him again. His physical abilities would also change, and he'd have to adapt his fighting style to his new vampire - enhanced strength and speed.
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.
If Luke joined the Empire in a fanfic, it would be a complete deviation from his original path. He might use his Force abilities to rise quickly within the Empire's ranks. However, his friends like Han and Leia would likely become his enemies, leading to intense and tragic confrontations.
As they go on adventures together, their bond would strengthen. They could face a great enemy like a powerful dark side user. In the heat of battle, they would rely on each other and start to trust more deeply. Ahsoka might see some of Anakin in Luke, which would make her more protective of him, and Luke would see Ahsoka as a wise mentor figure.
His character would likely become more complex. He would have to make tough decisions as an emperor, which might make him more calculating and less impulsive. He may also grow more powerful in the Force as he has to deal with the responsibilities of ruling.
Luke's character would become much more complex. He would likely start to show more aggression and a lack of mercy. His once - bright eyes might become clouded with darkness. For example, he could start using the Force in cruel ways, like choking his enemies without hesitation as Vader did.
When traveling to the future, Luke could become more desperate. Facing a world in chaos or a new, powerful enemy, he'd have to quickly adapt and find solutions. This would make him more willing to take risks and use powers in ways he hadn't before. His view of the Force might also expand as he encounters new forms of it in the future.
His character would develop in a very different direction. He'd be more independent and self - reliant. No longer bound by the strict Jedi code, he could explore the darker aspects of his personality. He might become more cynical and worldly. His skills with a lightsaber could be used more for intimidation and self - defense in the cutthroat pirate world. His view of the Force might also change, seeing it as a tool to gain power and wealth rather than just a spiritual guide.
His character would become more cynical. He'd lose his naivete and optimism. Instead of believing in the good of people, he'd see only their flaws.
If Deadpool joined the X - Men in fanfiction, his character could develop in several ways. He might learn to be more empathetic as he is surrounded by mutants with different backgrounds and struggles. The X - Men's mission of peaceful coexistence could influence him to be less bloodthirsty. Also, being part of a team could give him a sense of belonging that he may not have had before, which could make him more stable and less erratic.