A new alien race with a natural inclination towards the dark side could be the main antagonist. They see the Jedi as a threat to their way of life, which is based on conquest and domination. Luke has to figure out a way to either defeat them or find a way to coexist while still upholding the Jedi values.
One possibility for the main antagonist is a group of bounty hunters. Since Luke is now a criminal, they would be after the bounty on his head. They could be led by a particularly ruthless and skilled bounty hunter who has a personal vendetta against Luke. Maybe Luke once thwarted this bounty hunter's plans in the past, and now he sees this as a chance for revenge. Additionally, the New Republic could also act as an antagonist in a sense. They would see Luke as a threat to the peace and stability they are trying to build and would send their own forces to capture him.
The new story could focus on Luke's early days before 'A New Hope'. We could see him growing up on Tatooine, his first encounters with the Force, and how he got the idea to become a Jedi. There could be new characters introduced, like a hermit who gives him some initial training in the ways of the Force. It could also show his relationship with his friends at that time and how they influenced his journey to becoming a Jedi. This would give fans a deeper understanding of Luke's character and his origin story.
It could be the remaining Jedi. Since Luke has joined the dark side, the Jedi who still uphold the light side would be his natural antagonists. They would see him as a threat to all they stand for and would try to stop him from spreading the influence of the dark side. For example, Leia, if she still adheres to the Jedi teachings, would be in direct opposition to Luke.
Yes, there are often new novels related to Luke Skywalker being released. Check with major bookstores or online book retailers to find the latest ones.
Luke's friends from the light side could also be important. Characters like Leia, Han Solo, or Chewbacca. Their reactions to Luke's turn and their attempts to bring him back would be significant aspects of the story. There could also be new characters created specifically for this novel, perhaps some Jedi who were thought to be dead but are actually in hiding and oppose Luke's new path.
Palpatine could still be the main antagonist even if Luke turns to the dark side. He might try to use Luke as a more powerful weapon against any remaining Jedi or the Rebel Alliance. Palpatine would see Luke's newfound dark side power as a means to further his own control over the galaxy.
It could be the remaining Jedi. Since Luke is turning to the dark side, the Jedi who still uphold the light side values would be against him. They would see him as a threat to the balance they are trying to maintain and would try to stop him from fully embracing the dark side.
Anakin could also face an internal antagonist in the form of his own dark side. The pressures of the Clone Wars, his fear of losing Padmé, and his growing power could all contribute to his inner struggle. This internal battle could be personified as an antagonist that constantly tries to sway him to make wrong choices.
In fanfiction, when Luke meets Anakin, they might have an intense emotional reunion. Luke could finally get the father - son relationship he always desired. Anakin might impart some long - lost Jedi wisdom to Luke,弥补 the time they lost when Anakin was Darth Vader.
Sith cults could also be antagonists. They might sense the power of the unborn child in the Force and want to turn it to the dark side. They could launch attacks on Luke and Mara to either kidnap Mara or influence the unborn child through dark side magic or the Force.