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.
A cool plot could be that the Sage of Six Paths somehow gets reborn in Naruto's time but with his memories intact. They then have to deal with the political unrest in the ninja world together. Or perhaps a crossover where the Sage of Six Paths' spirit enters Naruto's body during a critical battle, giving him an unexpected boost in power and knowledge.
One idea could be that Naruto, with the power of the Sage of the Six Paths, gets transported to a different ninja world. There, he has to team up with new and strange characters to fight against an evil force that is threatening both worlds. Maybe this new world has different chakra rules and Naruto has to adapt quickly.
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.
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 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.
One idea could be Naruto from the Six Paths Sage mode getting crossed over into a modern-day world. He could use his powers to fight against new types of villains like super - powered criminals. Another plot could involve a crossover with a different anime universe, like Naruto meeting characters from One Piece and having to team up to stop a common threat that endangers both their worlds. Maybe a powerful ancient evil that has the ability to disrupt the balance of chakra in Naruto's world and the Devil Fruits' power in One Piece's world.
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.
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.
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.