Darth Vader could be an unexpected ally in a time travel scenario. If Luke travels to a time when Vader was still Anakin Skywalker and on the verge of turning to the dark side, Luke could try to prevent his fall. In the process, Anakin might become an ally, using his skills as a powerful Jedi to help Luke in whatever mission he has in that time period.
Obi - Wan Kenobi could be a great travel companion. Their relationship is so complex, and Obi - Wan could either be there to guide Anakin or to try and stop him from changing too much. Another possibility is Padmé. Since she was such an important part of Anakin's life, she could accompany him and influence his decisions during the time travel adventures.
Boruto could be an unexpected ally. Maybe he somehow gets caught up in the time - travel event with Sarada. They have a strong bond in their own time, and that would carry over. They could work together to face the challenges of the different time periods, like when they encounter powerful and dangerous ninjas from the past or future.
Poison Ivy could be her ally during time travel. Since they have a strong bond in their own time, Ivy could follow Harley through time accidentally. And Ivy's connection to nature might be useful in different time periods. For instance, in a pre - industrial Gotham, Ivy could use her powers to communicate with the natural world to find a way to get them back to their own time.
Maybe Rumplestiltskin. Even though they have a complicated history, in a different time period, they might find common ground. He could be interested in her time - traveling abilities and offer his own brand of help in exchange for something from her future knowledge.
If baby Luke time - travels to a post - apocalyptic future in the Star Wars universe, he could be the key to rebuilding the Jedi Order. His very existence could inspire the survivors to start anew. They might look at his pure connection to the Force as a sign that there is still hope for a better future, and they would protect and train him to become a great Jedi, changing the fate of the galaxy once again.
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.
It could be that Luke has a unique connection to the Force that gives him the power of time travel. He might have to enter a deep meditative state, and during this trance, he can project his consciousness through time. If he wants to physically travel, he has to use a great deal of his Force strength to fully materialize in another time.
A really interesting plot would be if Luke's time travel was accidental and he ended up in a parallel universe. In this universe, the roles of the Sith and the Jedi are reversed. He would have to figure out how to get back to his own universe while also dealing with the strange new world he's in. Here, he might learn things about the Force that he never knew before, like different ways to use it that are unique to this parallel universe.
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.
One great Luke Skywalker fanfic to start with could be 'The Life and Times of Luke Skywalker' as it delves deep into his character, exploring his journey not just as a Jedi but also as a person. It gives a very in - depth look at his relationships, his growth, and his struggles, which is really engaging for any Star Wars fan.