Another plot could involve Vegeta traveling to the future. He might find a desolate world ruled by an even more powerful enemy. This would force him to team up with unexpected allies, like former foes, to change the future. He could learn new techniques and bring that knowledge back to his own time.
One idea could be that Goku and Vegeta travel back in time to the Saiyan - Planet. They could try to change the fate of the Saiyans, like preventing Frieza from destroying their planet. This would bring a whole new set of challenges as they would have to deal with the Saiyan culture and politics of that time.
Maybe there could be a story where Android 18 gets sent to a different dimension and Goku and Vegeta have to follow her to bring her back. In this dimension, the rules of power and fighting are different. They all have to adapt quickly. Goku and Vegeta might learn some new skills from Android 18 as she has a different way of approaching combat situations due to her android nature.
Another aspect could be the impact on power levels. If a Saiyan travels through time and trains with their past or future selves, their power levels could skyrocket in unexpected ways. They might also bring back knowledge of new training methods from different time periods, which could revolutionize how Saiyans train and become stronger.
In some narusasu time travel fanfiction, Naruto might go back to the time when Orochimaru was first targeting Sasuke. He could then use his skills and knowledge to keep Sasuke safe and away from Orochimaru's influence. A different plot could be Sasuke traveling to a time when Naruto was ostracized as a child and being the one to support Naruto, which would change their relationship dynamic from the start. Also, they could travel to a time during a major battle and use their combined future knowledge to turn the tides in their favor.
One idea could be Madara traveling back to the era of the Sage of Six Paths. He could try to change the very foundation of ninjutsu, which would create a whole new timeline. Maybe he would attempt to gain the power of the Sage for himself much earlier in history.
One plot idea could be Naruino traveling back in time to prevent a great disaster in their world. Maybe a powerful enemy once defeated them in the past, and by going back, they can change the outcome. Another could be traveling to the future to see how their actions in the present have affected the world. For example, they might find that their current choices led to a utopia or a dystopia.
One plot idea could be Arya traveling back in time to the days before her family's downfall. She could use her knowledge and skills to prevent certain events from happening. For example, she might stop Ned Stark from making some of the political missteps that led to his execution. Another idea is Arya traveling to the future of Westeros. She could see the long - term consequences of the power struggles she was part of and try to change things in her own time. Maybe she'd witness a new dynasty rising or a great war that she could try to avert.
Maybe Chuck travels to the future and discovers that his actions in the present have led to a dystopian world. He then has to go back and make different choices to avoid that future. This could involve complex character development as he grapples with the knowledge of what might be.
Well, Anakin might time travel to a crucial moment in the Galactic Republic's history, like the Trade Federation's blockade of Naboo. He could use his skills and future knowledge to prevent the events that led to so much chaos. He could also travel to a time where he meets his future children as a stranger and has to figure out how to interact with them without revealing his true identity, all while trying to change the course of his own dark future.
One idea could be a character going back in time to prevent a major villain's origin. For example, if someone went back to stop All for One from corrupting Tomura Shigaraki as a child. Another plot could involve a hero traveling to the future to see the outcome of their current actions and then coming back to make changes. Maybe a student like Izuku Midoriya goes to a future where the heroes have lost and tries to change the present to avoid that fate.