One popular plot is Jiraiya going back in time and using his knowledge to prevent the Uchiha massacre. He could train Sasuke differently, or even find a way to resolve the conflict between the Uchiha and the village. Another plot might be Naruto traveling back with Jiraiya. They could team up to change events that led to the rise of Akatsuki, like stopping Nagato from going down the dark path. There are also plots where Jiraiya tries to change his own past mistakes, such as not being able to save Orochimaru from the darkness earlier.
A possible plot in Jiraiya time travel fanfiction could be Jiraiya traveling back to the time when the Uchiha clan was still intact. He could try to prevent the massacre, which would have a huge impact on the Naruto story. This would change the relationship between Sasuke and Naruto, as Sasuke's motives for revenge would no longer exist.
Well, in some fanfictions, Naruto time - travels to the time of the Senju and befriends Hashirama. They then work together to build Konoha in a different way. Maybe Naruto convinces Hashirama to make different alliances or to set up different training systems for the young shinobi. It often involves Naruto using his future - perspective to shape the village in a more positive light.
One popular plot is the main character traveling back in time to change certain events in the Naruto world and ending up with a harem. For example, they might prevent a major battle and in the process, gain the affection of multiple female characters like Sakura, Hinata, and Ino. Another plot could be that the time - traveler has some special knowledge from the future that makes them very attractive to the characters around them, leading to a harem situation.
One popular plot could be that Naruto and Kushina are sent back in time to a period before Naruto was born. In this new timeline, Kushina gets to know Naruto as a young man rather than just her baby. They form a deep bond as they face various challenges together, like protecting the village from a new, unexpected threat. This gives them a chance to have a different kind of mother - son relationship that evolves into a more complex, loving bond.
One popular plot could be Naruto and Kushina traveling back to the time when the Nine - Tails attacked Konoha. They could then use their knowledge to prevent the disaster. Maybe Kushina could find a way to better control the Nine - Tails and Naruto could help in the fight against any external threats.
Another plot could involve time travel as a means of fixing the Uchiha massacre. In this fanfiction, Naruto travels back and his harem, which consists of Uchiha members, helps him in this mission. They use their unique Uchiha abilities and their bond with Naruto to try and prevent the tragedy. This can lead to a lot of emotional and action - filled scenes as they face off against those who want the massacre to happen.
In this type of fanfiction, a frequent plot is Naruto traveling back to the time when Orochimaru was still a threat. He could use his knowledge of Orochimaru's plans to stop him before he became too powerful. He might also be able to save some of Orochimaru's victims, like the people he experimented on. Another plot is Naruto going back to the time when Pain attacked the village. He could come up with a better strategy to defeat Pain and save more of the villagers. And sometimes, the plot involves Naruto using his second chance to understand the secrets of the tailed beasts earlier and form a stronger bond with Kurama.
A third plot might be that they travel to a time way before the founding of the ninja villages. Here, they could witness the origin of ninjutsu and the early clans. They may try to influence the development of the ninja world from its very roots, perhaps even trying to create a more unified and peaceful ninja society from the start without all the future conflicts that were based on old grudges and power struggles.
One common plot is going back to prevent a major disaster. For example, they might go back to stop the Uchiha massacre. This gives them a chance to change the future of the ninja world.
Maybe they leave to find a cure for a strange disease that has started to affect the ninja world. Jiraiya has some clues about a special herb in a far - off region and they embark on a journey. During this, Naruto learns about the importance of perseverance from Jiraiya. They face many enemies who don't want them to succeed in their mission.