Well, one possibility is that they could use their future knowledge to prevent some of the tragedies that occurred in the original timeline. For example, they might be able to save some characters who died. They could also change the relationships between different ninja clans, making the ninja world more harmonious. And perhaps they would train harder in the past to become even more powerful ninjas in the future.
Their relationships would likely become stronger. They would have to rely on each other more in the unfamiliar past environment. For example, Naruto might look up to Kakashi even more as he sees how much Kakashi has grown and changed. Sasuke might be more open to the idea of teamwork as they face challenges together in the past.
In a Sakura and Kakashi time travel fanfiction scenario, they could be sent back to the time of the First Hokage. Here, they would encounter a much different ninja world. Sakura could learn about the original medical ninjutsu techniques from that era, while Kakashi could study the combat styles of the early ninjas. They could also play a role in some of the historical events, like the founding of Konoha. Their actions in the past would surely create a ripple effect that would change the future they came from.
Well, if Team Minato meets Team Kakashi in a fanfiction, it could lead to some epic battles or friendly competitions. Maybe they would have a sparring match to see which team is stronger. Team Minato with their speed and unique jutsus, and Team Kakashi with their diverse skills. Or they could collaborate on a mission, with Minato's leadership guiding both teams. It would be exciting to see how the different personalities interact, like Obito from Team Minato and Kakashi from Team Kakashi. They have a complex history that could be explored further in such a meeting.
Obviously, Kakashi is one of the main characters since it's about his time travel. Minato is also a central figure as he is part of Team Minato that Kakashi travels back to be with. And of course, the other members of Team Minato like Obito and Rin are likely to be important characters as well.
There's also 'Back to the Beginning: Team 7's Time Travel'. Here, Team 7 travels back to a crucial point in the Naruto universe's history. They end up changing some small things which have big consequences later. It's full of action and the character development is really well - done.
They might encounter advanced technology that they don't understand at first. For example, flying cars or instant teleportation devices. Their ninja skills could be put to the test in new and unexpected ways against futuristic enemies.
Kakashi's abilities would likely be enhanced in the past. He has all the knowledge and skills he's gained in the future. So, his combat skills would be more refined. His Sharingan would be even more powerful as he would know better how to use it. He might also be able to teach his younger self some new jutsu that he learned over the years.
In a 'Team 7 meets Anbu Kakashi' fanfiction, it's possible that they get involved in a dangerous mission together. Anbu Kakashi would be leading the team. His Anbu experience would come in handy in terms of stealth and quick decision - making. Team 7 would have to learn to adapt to his more strict and secretive Anbu - style leadership. They might face enemies that are much stronger than what they usually encounter, and Kakashi would have to protect them while also teaching them how to fend for themselves in such high - stakes situations.
A really cool plot might be that Kakashi time travels and discovers a hidden conspiracy in the past that was related to Team Minato. He then has to work with his past comrades, including Minato, to uncover the truth and prevent a great disaster that he knew about from his own time.
One good plot could be Kakashi going back in time and using his future knowledge to prevent the death of his comrades in Team Minato. For example, he might be able to stop Obito from getting crushed in that rockslide. Another plot could involve him trying to change the course of the war by influencing key decisions made by his team. He could also go back and try to train himself better in the past, using the skills he's learned in the future.