Another plotline could be centered around Naruto's relationships. His friends and allies might react differently to his new status. Some might be in awe, while others might be a bit jealous or worried. This could create some interesting dynamics and conflicts within the story.
Perhaps a plotline where Naruto uses his new status to bring about true peace in the ninja world. He could start by uniting all the hidden villages in a more profound way than ever before, sharing the secrets of the Sage of Six Paths to promote harmony and understanding among different ninja clans. This would involve complex diplomatic efforts and also dealing with those who oppose this radical change.
Another idea is that the Six Paths power in fanfiction could have unforeseen side effects on Naruto. He could start to have visions of the past Sage of Six Paths' life in more detail, and these visions could either guide him or mislead him. This would add a new layer of mystery and internal conflict to Naruto's character as he tries to figure out what these visions mean and how to use the power without being consumed by it.
Obviously, Naruto is one of the main characters as the story is centered around him being the son of six paths. Sasuke could also be a main character as he has always been Naruto's rival and friend. Their relationship would likely be further explored in this fanfiction.
One interesting plot could be exploring how Naruto's new powers from the Six Paths change his relationships. For example, how does he interact with Sasuke now that he has such god - like abilities? Maybe he becomes more of a mentor figure to the younger generation in the village.
One interesting 'Naruto is Sage of Six Paths' fanfiction could be where Naruto uses his new powers in unexpected ways. For example, he might be able to travel through different dimensions more easily. Another could be a story where he has to teach the next generation about the power of the Sage of Six Paths.
There are fanfictions where Naruto having the Six Paths power changes the entire power dynamic in the ninja world. In some, he becomes a sort of unifying figure. Since he has such great power, he uses it to bring all the ninja villages together in peace. He might share the knowledge of the Six Paths power with other ninjas, so they can all become stronger and protect their villages better.
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 backstories of each of the Six Paths of Pain in more detail. Maybe show how Nagato came to choose them and what their lives were like before being made into his powerful tools. Another plot could be a scenario where a character tries to redeem the Six Paths of Pain instead of simply fighting them. This could involve a deep understanding of their pain and the reasons behind Nagato's actions.
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 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.