One interesting plot could be Naruto using his future knowledge to prevent some of the tragedies that happened in the original story. For example, he might be able to stop the Uchiha massacre. Another plot could be him training his younger self, leading to a much stronger Naruto earlier on. And perhaps he could also change the relationship between the different ninja villages, promoting more peace and cooperation from an earlier stage.
In this fanfic, an interesting plot could be Naruto's interaction with the past versions of his teachers. He could give Iruka some advice on how to better teach young ninjas, based on his own experiences. He might also help Kakashi deal with his past traumas more quickly. And Naruto could use his knowledge of the future to assist the Hokage in making better decisions for the village, which would have a huge impact on the overall story and the future of the ninja world.
One interesting plot could be Naruto using his future knowledge to prevent the death of some important characters like Jiraiya. He might be able to warn Jiraiya about Pain's true identity in advance and change the outcome. Another plot could be Naruto influencing the relationship between Sasuke and the village earlier, preventing Sasuke from leaving in the first place. He could also use his experience to train more effectively from a young age and become even stronger faster.
In some 'naruto goes mad' fanfictions, Naruto might be driven mad by the loss of his friends. For example, if Sasuke were to die in a battle, Naruto could lose his grip on sanity. Another plot could be the result of some dark jutsu being used on him, like a genjutsu that messes with his mind. Maybe a powerful enemy targets his mental state to turn him into a weapon against the Hidden Leaf.
In some 'naruto goes blind fanfiction', an interesting plot could be Naruto having to rely on his other senses more. For example, his sense of smell and hearing become super sharp, allowing him to detect enemies and navigate in battles like a true ninja. He might also develop new jutsus that are more suitable for his blind state, like a sound - based attack that can stun opponents.
One interesting plot might be Ash's struggle to adapt to the laid - back lifestyle in Alola. He's used to the more fast - paced adventures in other regions, but in Alola, things move at a different tempo. Also, there could be a plot where he teams up with local trainers to solve a mystery related to an ancient Alolan Pokémon legend. Maybe there's a hidden power or a lost Pokémon that they need to find.
Well, in some 'naruto goes to alternate universe fanfiction' plots, Naruto might find himself in a world where all the ninja clans have merged into one big super - clan. He'd have to navigate the complex politics within this new structure. Also, there could be a plot where he enters an alternate universe where the Fourth Great Ninja War never happened, but there are new threats emerging that he has to face. And then there's the idea of a universe where Naruto's parents are alive, and he has to deal with a completely different family dynamic.
Another plotline could be Naruto influencing the relationships between characters. He could try to bring Sasuke back to the village much earlier in the timeline, preventing a lot of the pain and conflict that occurred between them. Or he could help his parents, Minato and Kushina, in ways that would change the future of the entire Hidden Leaf village.
One interesting plot could be Naruto using his future knowledge to prevent some tragic events in the past. For example, he might stop the death of certain characters or change the course of a big battle.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.
One interesting plot could be Naruto Uchiha using his future knowledge to prevent the Uchiha massacre. He might try to change the minds of the village elders and stop the cycle of hatred before it spirals out of control.
One interesting plot could be that female Naruto goes back in time and uses her knowledge from the future to prevent the destruction of her village. She might try to stop certain villains from emerging or change the fates of her friends who died in the original timeline. For example, she could stop Orochimaru's early evil plans, which would have a huge impact on the story's development.