Another plotline could be that Naruto from the future comes to a time where all his friends are in danger. He has new powers and abilities that he has to use to protect them. But at the same time, he has to figure out who the new enemy is, which could be a group that emerged as a result of some political changes in the ninja world after his time.
One interesting plotline could be Naruto seeing how his actions in the past have shaped the future of the Hidden Leaf. For example, if he discovers that a decision he made led to a new alliance or a new type of jutsu being developed.
One possible plotline could be Naruto seeing a future where his friends are in great danger and he has to find a way to change the course of events. For example, he might see that Sasuke is about to be captured by a powerful enemy, so he starts training extra hard to be able to rescue him.
One possible plotline could be Naruto traveling to a future where the Hidden Leaf Village has achieved a new level of technological advancement. He might be shocked to see how ninjutsu has been integrated with high - tech devices. Another could be a future where old enemies have formed new alliances and Naruto has to figure out how to deal with this changed political landscape.
One possible interesting plotline could be the exploration of a new power that the main character discovers, which is a result of their strong will. This power might set them on a journey to change the Naruto world in unexpected ways.
One interesting plotline could be Naruto exploring his darker side in more depth. Maybe he discovers a hidden power within him that is related to the 'darkness' and has to learn to control it without being consumed by it.
One interesting plotline could be Naruto's journey of self - discovery in exile. He might meet new allies who help him harness his powers in ways he couldn't in Konoha. Another could be his attempts to prove his innocence or show Konoha what they lost by exiling him.
Another plotline could involve the Jedi watching the future of individual planets. For example, they see a planet on the brink of destruction due to environmental disasters and use their knowledge to guide the planet's inhabitants to save it. This could also lead to new alliances and diplomatic efforts among different species.
One interesting plotline could be the mystery behind the mask. Maybe it has some special power that only Naruto can unlock or it could be related to an ancient prophecy. Another could be a new villain who uses the mask to create chaos in the ninja world and Naruto has to stop him.
Perhaps Naruto discovers a new medical jutsu that combines his chakra control with traditional medical knowledge. This could revolutionize the medical field in the Naruto universe. He might use it to heal previously incurable diseases or injuries, and in the process, gain the respect of the medical community. This could also lead to some interesting interactions with other medical ninja, like Shizune or Tsunade.
Well, in some fanfics, there's a plotline where Hinata loses her memory and Naruto has to make her fall in love with him all over again. It's a classic but still very engaging. There are also stories where they are arranged to be married for political reasons at first, but then they actually fall in love for real during the process. And a really unique one is when Hinata becomes a super powerful ninja overnight and Naruto has to deal with his feelings of being a bit overshadowed while also being proud of her.
One interesting plotline could be Naruto joining the Akatsuki and trying to change it from the inside. He might use his ideals of friendship and peace to influence the other members who have mostly known a life of darkness and violence.