It could be an older version of Orochimaru who has also found a way to time travel. He might try to change the past to his advantage, like getting rid of the Third Hokage before he can become a threat to his future plans. Orochimaru is always power - hungry and his older self could be even more dangerous with knowledge of the future.
A possible plot is that the Third Hokage travels back to when he first became Hokage. He realizes all the mistakes he made in his first term and gets a second chance to do things right. He could focus more on training the younger generation, like Naruto and Sasuke's predecessors, in a better way. He could also be more proactive in dealing with external threats and internal conflicts, which would have a huge impact on the future of Konoha.
One great 'Naruto Hokage Time Travel Fanfiction' is 'A New Beginning'. It has an interesting plot where Naruto travels back in time and uses his knowledge to change many things in the ninja world. The character development is really well - done, especially how Naruto becomes more cautious and strategic with his second chance at life.
Another possibility is Naruto traveling back to his own childhood days. He could mentor his younger self, teaching him advanced jutsu and wisdom he's gained over the years. This would make his younger self much stronger much earlier, and might also change how he interacts with Sasuke. For example, he could help his younger self better understand Sasuke's pain and prevent some of their earlier conflicts.
One common theme is redemption. Since Kakashi can go back in time, he often tries to make up for past mistakes or prevent tragedies that occurred in the original timeline. For example, he might try to save a character who died before. Another theme is the changing of fates. He can change the destiny of not only himself but also of his friends and the whole village. He can use his knowledge of future events to better prepare for threats.
One common theme is redemption. Sasuke, for example, might get a chance to correct his past mistakes during the time travel. Another theme is the exploration of their relationship. Since Naruto and Sasuke have a complex bond, time travel can show how it could have been different or how it's strengthened. Also, changing the fate of the ninja world is a big theme. They might try to prevent certain disasters or change the course of history.
Another idea for this fanfiction is that Naruto's time travel as the 6th Hokage could lead to him meeting his predecessors in a different way. He could learn new jutsu or leadership skills directly from them. For instance, he could have in - depth conversations with the 1st Hokage, Hashirama, about how to better manage the relationships between different ninja clans and build a stronger, more united village.
If Kakashi travels back in time, his actions could have a butterfly effect. For example, if he saves someone who was supposed to die, that person's actions in the future could be completely different. This could lead to changes in alliances, battles, and even the political structure of the village.
No. In the official Naruto series, Naruto is the son of the Fourth Hokage, Minato Namikaze. Fanfiction might play around with this concept for creative or alternate universe purposes, but it goes against the original lore.
In this fanfiction, Naruto might save the Third Hokage by using his newfound powers. Maybe he taps into a deeper level of his chakra and arrives just in time to fend off the enemy attacking the Third. His determination and growth as a ninja would play a crucial role in this rescue.