One interesting plot could be Naruto getting a second chance at life and using his knowledge from his first life to prevent the Fourth Great Ninja War. He could focus on training his friends earlier and revealing Orochimaru's plans much sooner. This would change the entire course of the shinobi world and lead to new alliances and power dynamics.
One possible plot could be that Naruto somehow stumbles upon the Book of Life. Maybe he's on a mission in a mysterious land and finds it. The Book of Life has the power to rewrite destinies, and Naruto, being Naruto, wants to use it to bring back his fallen comrades like Jiraiya. But he soon realizes that meddling with the Book of Life has unforeseen consequences. It could start to distort the balance of the ninja world as the fates of many are intertwined. Villains might also get wind of it and try to snatch it from Naruto to fulfill their own evil desires.
Well, perhaps Naruto could find himself in the middle of a crucial battle during the Second Shinobi War. He could befriend some of the young shinobi who later become important figures. He might help them out in a difficult situation, like rescuing a group of shinobi from an ambush. This would change the course of the war in small ways and also form strong bonds with those from the past.
Well, the plot could revolve around a shinobi who has a special ability that is both a curse and a gift. During the Second Shinobi War, this shinobi is hunted by different factions because they believe his ability can be used to tip the scales of the war. However, the shinobi doesn't want to be a part of the war and is constantly on the run. In the end, he might be forced to use his ability to save a large number of people, including those from the villages that were hunting him, and in doing so, he changes the perception of his ability.
One idea could be a character who was thought to be dead is brought back to life by a powerful and mysterious jutsu. But this character has to adapt to the new Naruto world which has changed a lot since they 'died'.
A really interesting plot twist could be that the cause of the Second Great Ninja War in the fanfiction is not what it seems in the original Naruto lore. Instead of territorial disputes or power struggles, it could be due to an ancient curse that has been awakened. This curse affects the minds of the ninja, making them more aggressive and starting the war. And only a few special characters might be able to figure out the real cause and try to stop it.
One possible interesting plot could be Naruto finding out that the 'game' has hidden quests related to his family's past. For example, he discovers a quest that leads him to learn more about his mother's clan and the special powers they held. This could add a whole new layer to his character development as he tries to master these newfound abilities within the game - like framework of his life.
In 'Naruto Life as a Devil' fanfiction, the plot could center around Naruto being sent to a different dimension where he is turned into a devil. In this dimension, there are different rules and power hierarchies. He may have to form alliances with unlikely characters in order to survive. He could also be on a quest to find a way to return to his normal self and the Konoha he knows, all while learning to control his devilish powers which might include things like shadow manipulation or enhanced physical abilities.
One possible plot could be Naruto being assigned to Team 10 temporarily. He could bring his unique energy and skills to the team. For example, his Rasengan technique might inspire new ideas among Team 10 members for their own jutsu development. His never - give - up attitude could also influence them during difficult missions, like when they face a powerful enemy ninjas and are on the verge of defeat.
Perhaps Naruto is in Kumo to search for a missing Konoha ninja. While there, he uncovers a conspiracy within Kumo that threatens both villages. He then has to team up with some of the Kumo ninjas who initially distrusted him to stop the threat.
One possible plot could be Naruto arriving in Gotham and using his ninja skills to combat the crime lords. His ability to move stealthily and use his jutsu might give the criminals a run for their money. He could team up with Batman, and together they'd be an unstoppable force against the likes of the Joker and Penguin.