Well, perhaps a group of outcast ninjas who have been mistreated by the major villages join forces. They develop a new and powerful fighting style that no one has seen before. They start by infiltrating the smaller villages, taking them over quietly, and then use the resources and manpower of those villages to launch a full - scale attack on the larger ones, aiming to take over the entire Naruto world.
A time - traveling villain could be an interesting concept. This villain comes from a future where the Naruto world is in ruins due to some great disaster. He travels back in time with the knowledge of future events and powerful future - era jutsu. He decides to take over the world in the past to prevent the disaster from happening in the first place, but his methods of taking over are extreme and involve subduing all the powerful shinobi clans and villages.
Well, one interesting idea could be the unique powers that come with the demon takeover. For example, the main character might gain super strength or the ability to control certain elements. Another aspect could be the internal struggle the character faces when the demon influence starts to take over their mind.
One idea could be Naruto as a street artist in a modern city. He uses his ninja skills to create amazing and fast art, like how he throws kunai, he throws paintbrushes to make unique patterns. Another is having Sasuke as a corporate spy, using his Sharingan to gather information secretly in high - tech business meetings.
One idea could be that Naruto characters are transported to the World of Warcraft universe. They could form alliances with different races like the Night Elves, with Naruto's ability to befriend others coming in handy. Another could be that the chakra system in Naruto somehow interacts with the magic in WoW, creating new and powerful spells.
One idea could be that Naruto arrives in a world full of magic. He tries to understand and master the new magic system using his ninja skills as a base. For example, he might find that his chakra control can be adapted to control magical energy in a unique way.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
One idea could be a 'what if' scenario where Naruto has a different elemental affinity from the start. For example, if he was born with a natural affinity for water instead of wind.
One idea could be a crossover where Naruto somehow ends up in the world of Koneko. He could meet Koneko and they team up to face a common enemy. Maybe an evil force that is threatening both their worlds.
Well, a plot idea might involve Naruto being a servant in a world full of mythical creatures. He could use his combat skills and ability to make friends to form alliances between different species. Also, he could be a servant in a high - tech world where his ninja techniques are seen as a novelty, and he has to prove their worth. And then there's the idea of Naruto serving a time - traveling master, going to different historical periods and changing things for the better.
One idea could be Naruto arriving on Earth during a major global crisis, like a widespread natural disaster. He could use his ninja skills to rescue people. For example, his shadow clone jutsu would be very useful in searching for survivors in multiple locations at once.
One idea could be a story where a powerful shinobi becomes a slavemaster in a hidden part of the Naruto world. He could train slaves to be his spies. For example, he finds an orphan with special chakra abilities and trains him to infiltrate enemy villages. Another plot could involve a slavemaster who uses his slaves to gather rare herbs and resources in dangerous areas. Maybe he has a group of slaves that are immune to certain poisons and sends them into a poisonous swamp to find a valuable plant for a powerful jutsu.