Maybe in the future fanfiction, Naruto has to deal with a new threat from a far - off land that has a completely different style of ninjutsu. He has to learn about their ways in order to defeat them. For example, they might use elemental ninjutsu in a combined and more complex way than what is known in the Leaf Village.
One idea could be Naruto's son or daughter discovers a new and powerful jutsu that was lost in time. This jutsu could potentially change the balance of power in the ninja world.
One idea could be exploring how Naruto's children deal with new threats to the Hidden Leaf Village. Maybe they face a villain who has found a way to use ancient, forbidden jutsu that Naruto and his friends had long forgotten about.
In 'Naruto Future Memories Fanfiction', there could be a plot where Naruto's future memories show a world where the ninja villages have all been destroyed. He then has to find a way to change the course of history. He may start by looking into the root causes of the destruction in his memories, like a powerful and evil enemy that no one was prepared for. He might then gather all the ninja villages together to form a united front against this potential threat, using his knowledge from the future memories.
One idea could be an OC who is a time - traveler from the future. They come back to the Naruto world to prevent a great disaster that they know will occur in the future. This OC could have unique powers related to time manipulation or future - sight.
One interesting plot idea could be Naruto's son, Boruto, facing a new and powerful enemy that has ties to an ancient evil from the past that was thought to be sealed away long ago. This enemy could be manipulating the new generation of shinobi in the Hidden Leaf Village, causing chaos and mistrust among them.
One idea could be Naruto becoming a mentor to a new generation of ninja. He could pass on his unique skills and the importance of friendship and hard work.
In the 'everyone sees naruto's future fanfiction', it could be that they see Naruto's future self as being too powerful for his own good. He might be on a path that leads to him being isolated because of his strength. His friends then would strive to guide him onto a different path, one where he can still be strong but also maintain his relationships.
One idea could be Naruto seeing a future where the Hidden Leaf Village is in ruins due to a new, powerful enemy. He then spends his present time training harder and forging new alliances to prevent this future. Another plot could involve him seeing his friends in danger in the future, so he starts to teach them new jutsus in the present to better protect themselves.
Perhaps the characters from the Future Diary world end up in the Naruto universe. Yuno could form an interesting relationship with Naruto. She might see his strong will and be both intrigued and challenged by it. They could team up to fight common enemies, with Yuno's unpredictable and often violent nature contrasting with Naruto's more positive and forgiving attitude.
Maybe in the future fanfiction, the Glee Club has inspired a new generation of performers. The old members become mentors to these young talents. There could be a plot where they compete in a new, high - stakes singing competition against other groups inspired by different musical shows.
One idea could be to explore what would happen if Yuno was a pacifist from the start. Instead of her violent ways, she tries to win the survival game through cooperation and strategy. Another could be a story where the rules of the Future Diaries are changed slightly, like the diaries predicting different time frames or having limited visibility. Also, a fanfiction where the characters are transported to a different world while still having their diaries could be really cool.