One idea could be a battle where Naruto uses his unique jutsu in a strategic way inspired by the Art of War. For example, he could use the concept of 'know your enemy' to outwit an opponent who has a new and powerful ability. He might study their fighting style beforehand and then use his own skills to counter it effectively.
Another plot could involve different ninja clans coming together to form an alliance, similar to how armies might unite in the Art of War. They could face a common enemy that threatens the entire ninja world. Naruto could be the key figure in bringing them together, using his charisma and understanding of the importance of unity as per the principles of the Art of War.
One idea could be a crossover where Naruto characters are brought into the Asterisk War world. They could participate in the Festas and show off their unique ninja skills. Another could be a story where a character from Asterisk War discovers a hidden Naruto jutsu and tries to master it. Maybe a story about how the values of the Naruto world, like friendship and perseverance, influence the characters in Asterisk War.
One idea could be exploring the backstories of minor characters during the Fourth War. For example, how the ordinary shinobi coped with the chaos and fear. Another could be a different strategy for the Allied Shinobi Forces that changes the course of the war in unexpected ways.
One idea could be exploring an alternate timeline where the main characters have different allegiances. For example, Sasuke could side with Orochimaru permanently and Naruto has to find a way to bring him back without fighting. Another could be a story where the Akatsuki are actually working for a greater good that was misinterpreted, and Naruto teams up with them to fight a common enemy.
One idea could be a war game where the characters are divided into teams based on different ninja villages. For example, Naruto could lead a team from Konoha against Sasuke's team from a new, self - made village. Another idea is a war game that involves time - travel, where characters from different eras of the Naruto world have to fight in the same battlefield. Maybe the older generation of Hokages fight alongside the new generation in a unique war game scenario.
One idea could be the discovery of a new, extremely powerful beast that changes the power dynamics in the Naruto world. Maybe it has unique abilities that no one has ever seen before.
Another plot idea is that Kratos somehow ends up in the Naruto universe. He could be mistaken for a powerful rogue ninja at first. His brute strength and combat skills would make him a force to be reckoned with. He might get involved in the conflicts between the ninja villages, and his no - nonsense attitude could either cause more chaos or actually help bring about peace in a rather unexpected way.
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.
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.