When Sasuke travels to the Sannin era, his abilities are a mixed bag. His fire - based jutsu from his Uchiha heritage would be formidable. However, compared to the Sannin, his understanding of nature chakra might be lacking. Jiraiya, for instance, had a deep connection to nature chakra. Sasuke would have to learn quickly to keep up. His Sharingan could give him an edge in combat, but he would also need to adapt his fighting style to the more raw and less refined combat of that era.
Sasuke's abilities would be both advanced and out of place. His Sharingan skills would be very powerful compared to most in the Sannin era. But he would lack some of the basic knowledge and skills that were common in that time. For example, he might not be as well - versed in some of the traditional ninjutsu styles.
Sasuke's abilities in a time travel to the Sannin era would be a point of interest. His Sharingan gives him the ability to copy jutsu, which could be a huge advantage. But the Sannin had their own unique abilities. Tsunade's superhuman strength and medical ninjutsu, Orochimaru's snake - based jutsu and immortality experiments, and Jiraiya's toad - related jutsu. Sasuke would have to find a way to combine his modern - day skills with the knowledge and abilities of the Sannin era. He would also have to be careful not to over - rely on his Sharingan, as it could attract unwanted attention from those who might want to study or steal its power.
In a Sasuke time travel to the Sannin era fanfiction, Sasuke would be faced with a lot of opportunities and challenges. He could use his knowledge from the future to his advantage. For example, he might know about certain threats that the Sannin were not aware of. He could also be a key player in the battles of that era. His Sharingan would be a very valuable asset. However, he would also have to adapt to the different political and social situations of that time. His interactions with the Sannin would not only change his own future but also the future of the shinobi world as a whole.
Orochimaru's experiments and his knowledge of forbidden jutsu would be far ahead of the time he travels back to. He could use this to his advantage, perhaps by creating new techniques based on the limited knowledge of the past. However, he also has to be careful not to change the future too much as his actions in the past could have unforeseen consequences for his future self.
Luffy's abilities would be quite different in Roger's time. His rubber powers would be something unheard of. He would likely be seen as a very strange and powerful individual. Roger and his crew might be both intrigued and cautious around him. His Gear techniques would be a huge advantage as no one in that era would have seen anything like it.
He could change the fates of the Sannin. For example, if Naruto helps Jiraiya in his battles, Jiraiya might not die later. This would have a huge impact on the overall Naruto story. Also, Naruto's Rinnegan abilities could make him a target for the villains of that era. They would either try to steal his power or kill him, which would create new storylines.
In the past, Tom's magical abilities were already quite strong even as a young student. His natural talent for magic was evident. However, if Harry travels back in time, he would bring with him the knowledge and skills he has learned in his own time. So in terms of spellcasting knowledge, Harry might have an edge as he knows spells that were not yet invented or commonly known in Tom's time. But Tom's raw power and his understanding of magic from his own era's perspective would be formidable.
If Sasuke travels to the past, his relationships would be completely transformed. With his clan members, he would have a chance to interact with them in a new light. He might try to warn them about their impending doom, which could change the dynamic from one of normal family relations to one of him being a seer of sorts. Regarding Kakashi, Sasuke could either use his knowledge of Kakashi's teaching methods to his advantage or try to change how Kakashi trained him. And when it comes to his enemies in the past, like Orochimaru, Sasuke might approach him differently. He could try to avoid Orochimaru's influence altogether or try to turn Orochimaru into an ally against the greater threats that he now knows about from the future.
One possibility is that Naruto with his Rinnegan powers could disrupt the power balance in the Sannin era. His modern jutsu and knowledge might give him an edge. For example, he could use his Rasengan in ways that the shinobi of that time have never seen. He might also form unexpected alliances, like befriending Orochimaru before he goes bad, which could change the entire future of the Naruto world.
His combat abilities might be overpowered in some earlier time periods where the fighting styles are less developed. For example, if he travels back to a time when lightsaber combat was more rudimentary, his advanced techniques could make him seem like a god of war.
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.
Naruto would be an ideal time - travel companion for Sasuke. They have a complex relationship and Naruto's positive attitude and determination could balance out Sasuke's more brooding nature. Naruto could also offer different perspectives on how to handle situations in the past. Plus, their combined skills would be a force to be reckoned with in any time period.