One idea could be a story where a young cloud shinobi discovers a hidden power within himself that has the potential to change the balance of power in the ninja world. He then has to struggle with whether to use it for good or be tempted by the dark side.
A really interesting plot could be a time - travel fanfiction. A character from the future, perhaps one of Naruto's descendants, travels back in time to prevent a great disaster that is about to befall the shinobi world. This would involve a lot of twists as they try to change the past without disrupting the timeline too much.
Another plot could focus on a new character in the 'naruto path of shinobi' world. This character could be from a small, unknown village and have a unique ability that catches the attention of the major villages. They then have to navigate the politics and power struggles among the different shinobi groups.
Another interesting concept is a time - travel fanfiction. Maybe a character from the future goes back in time to change an important event in the Naruto world, like preventing the Uchiha massacre. This would have a huge impact on the entire storyline.
One idea could be focusing on a young, unknown shinobi who rises to prominence during the war. They might have a unique jutsu that catches everyone's attention.
Another plot could revolve around a young shinobi from a major clan who tries to prevent the wars by forging alliances between the clans. This would involve a lot of political intrigue and character development as they face opposition from within their own clans.
In a Naruto 4th Shinobi War fanfiction, we could have a plot where the Akatsuki actually had a hidden agenda that was not related to the tailed beasts at all. They could be using the chaos of the war as a distraction to perform some other dark ritual. And perhaps a young shinobi discovers this and has to race against time to stop them while also fighting in the war.
One idea could be focusing on a young and inexperienced ninja who gets thrust into the chaos of the Third Shinobi War and has to quickly learn to survive. Maybe they form an unlikely alliance with a ninja from an enemy village because they both realize the senselessness of the war at a personal level.
One idea could be exploring the backstories of minor characters during the war. For example, how the normal shinobi were feeling and what they were doing on the sidelines. Another could be a what - if scenario where a different alliance was formed among the shinobi villages.
One idea could be a story where Naruto enters a virtual gaming world that mimics the shinobi world. He has to use his real - world skills to overcome new digital challenges. For example, he might face digital clones of his toughest enemies with different abilities.
One idea could be a story where a new, unknown shinobi emerges during the wars with a unique power that changes the balance of power. This shinobi could initially be seen as an enemy but later turn out to be an ally with a noble cause.