Another idea is that the Sage of Six Paths appears in a time of great turmoil when Naruto and Sasuke are at odds again. His presence forces them to re - evaluate their relationship and the meaning of power. He reveals secrets about their past lives and how they are connected not just to each other but also to the very fabric of the ninja world. This causes them to team up once more to face a common enemy that is threatening to destroy everything they hold dear.
One plot idea could be that Naruto and Sasuke are sent back in time by the Sage of Six Paths to prevent a great disaster that is going to happen in the future. They have to work together to figure out how to change the course of events while also learning more about the Sage's powers and their own destinies.
Maybe the Sage of Six Paths gives Naruto and Sasuke a special mission to unite all the hidden villages in a new way. They face resistance from some who fear change, but with the knowledge and power passed down from the Sage, they start to make progress. Along the way, they also discover new forms of chakra that the Sage had hidden away. This could lead to some really cool battles and character development for both of them.
One interesting plot idea could be that Naruto and Sasuke have to go on a joint quest assigned by the Sage of Six Paths in a dream. They are sent to a parallel universe where the ninja world is ruled by dark forces and they have to find a way to bring back the light. Another idea is that the Sage of Six Paths gives them new powers that they have to master together to defeat an ancient evil that has been awakened. Maybe they also have to deal with their own inner demons during this process as the new powers also come with some psychological challenges.
One interesting plot could be about Naruto exploring more of the Sage of Six Paths' untold teachings. For example, he discovers a new jutsu that was lost in time but was once known to the Sage. This could lead to him becoming even more powerful and facing new threats in the ninja world.
One idea could be exploring the training of Naruto by the Sage of the Six Paths in more detail. Maybe the Sage could teach him some long - lost jutsu. Another idea is to have Naruto travel back in time to the era of the Sage and witness the creation of ninjutsu first - hand.
Perhaps a fanfiction where Naruto, as the Sage of Six Paths, has to face a new and powerful enemy that threatens the entire ninja world. He would have to use his newfound powers and wisdom to protect everyone.
One idea could be Naruto having to face an ancient evil that threatens to disrupt the balance between the six paths and the avatar world. He might have to learn new jutsu inspired by the avatar elements. Another could be Naruto forming an alliance with avatar characters to fight a common foe, like a powerful dark spirit that can cross between their universes.
Perhaps a plot where Naruto has to teach the Sage of Six Paths Senjutsu to a new generation of ninjas. This could involve dealing with their different learning abilities and personalities, and also facing threats from those who want to misuse this powerful technique. It could also show how Naruto has grown as a teacher and a leader.
One idea could be Naruto traveling to a different universe where the Sage of Six Paths is still alive and they team up to face a new, powerful enemy. Another could be a fusion of their powers in a strange way due to a magical artifact in the crossover world. Maybe Naruto gets to learn new jutsu directly from the Sage in a more in - depth way than he did in the original story.
One idea could be exploring the backstory of the Sage of Six Paths in more detail. Maybe his early life, his training, and how he came to be the powerful figure he is. Another plot could involve a modern - day ninja somehow getting in touch with the power or spirit of the Sage of Six Paths and having to deal with the consequences. For example, they might gain new abilities but also attract dangerous enemies.
In some fanfictions, the reincarnation might lead to a different kind of bond between the main character and the tailed beasts. For example, they could communicate on a deeper level and share knowledge that was lost in the past. This could change the power dynamics in battles and how the character progresses in the story.
A cool plot could be that the Sage of Six Paths, seeing Naruto from the future, mistakes him for an omen. Naruto then has to prove his good intentions and work with the Sage to unite the early ninja world in a different way than history originally told, which could lead to a completely different future for the ninja world.