Maybe they would meet the younger versions of the Jedi Masters. They could learn a great deal from them and bring back long - lost Jedi knowledge to their own time. It would be really interesting to see how the younger Jedi Masters interact with Luke and Rey.
In this fanfiction, they could also influence the technology development in the past. Since they have knowledge of more advanced technology from their time, they might introduce some new concepts that could speed up the development of things like starship designs or lightsaber technology in the past.
Well, they might prevent some great tragedies in the Star Wars universe. For example, they could stop Anakin from turning to the Dark Side. This would completely change the course of history in the galaxy.
The Sith, of course. Even in the past, the Sith would be a major threat. They might try to stop Luke and Rey from changing things that would be detrimental to their plans for galactic domination.
Luke could also go back to meet his father, Anakin, when he was still a young boy. He could be like a mentor to him, teaching him about the Force in a different way. This might prevent Anakin from ever turning to the dark side, which would rewrite the entire Star Wars story. He could introduce Anakin to different ways of using the Force that are more positive and less focused on power and control.
Well, one possibility is that they could completely rewrite the history of the ninja clans. Naruto, with his positive influence, might be able to make the Uchiha clan feel more accepted in the Leaf Village, preventing the Uchiha massacre. Obito, having seen the destruction his actions caused in the future, could help Naruto in these efforts. Also, they could work together to train younger versions of themselves and their friends to be even stronger, which would have a huge impact on future battles.
Well, they might change some major events. For example, they could prevent a big battle that had a lot of casualties in the original timeline. Maybe they'd help their parents at a younger age, giving them an edge in fights. They could also introduce new techniques to the past, which would change the power balance among the Z - fighters.
Maybe they would meet their ancestors. Percy could see his Greek hero predecessors and Artemis might interact with the first hunters she ever had. This could lead to some interesting exchanges, like learning forgotten hunting techniques or ancient combat skills.
In a time - travel fanfiction like this, they could also have the opportunity to meet long - lost characters or discover secrets that were lost in time. Naruto and Shikamaru could learn about the origin of some of the powerful jutsus in their world. And perhaps they could use their knowledge of future technology or ninja tools to create something revolutionary in the past. This could potentially change the balance of power among the ninja villages. However, they would also have to be careful not to be discovered as time - travelers, as that could lead to all sorts of complications.
They might change some crucial events in their past. For example, Stefan could prevent some of the bad things he did while being a ripper. Caroline, on the other hand, could go back to when she was a human and make different choices about her relationships or her path in life.
Well, they could also change their own relationships. Maybe Naruto wouldn't be so alone as a child, and Ino could become a stronger ninja earlier. They might train together in ways they didn't before, using the knowledge of future jutsu and strategies. They could also influence the relationships between different ninja clans, like improving the relations between the Uzumaki and the Yamanaka clans.
Well, they might change some important events. For example, they could prevent certain tragedies from happening in the wizarding world. Maybe they'd save some characters who died in the original timeline.
Well, they could change their own relationships. Perhaps Hermione would be able to help her younger self be more confident. Ron might stop himself from making some of the silly mistakes he made in the past. And Harry could get to know his parents better. They could also influence the development of magic in Hogwarts. For instance, introduce some new spells or magical concepts they learned in their original time.