A really cool plot could be that a blade master from another dimension accidentally gets sucked into the Naruto world during a portal experiment gone wrong. This blade master has powers that are completely foreign to the Naruto characters. They then team up with Naruto and his friends to fight a new and powerful enemy that threatens both their worlds, all while the blade master tries to find a way back home.
Perhaps a plot where a blade master is secretly an ancient shinobi from a forgotten clan in the Naruto world. The character could hold the key to unlocking a powerful jutsu that is related to blade manipulation. As the story unfolds, they must fight against those who want to use this power for evil while also rediscovering their true heritage.
Another plot could involve a character from Blade of the Immortal being transported to the Naruto universe. This character could be an enemy at first, but then as they learn about Naruto's world and his ideals, they become an ally. They could teach Naruto some unique fighting techniques with the Blade of the Immortal.
Another interesting plot would be if the Executioner's Blade had a mind of its own. It could choose its wielder, and Naruto has to prove himself worthy to it. This could lead to a journey of self - discovery for Naruto as he tries to understand what the blade wants from him and how he can use it for good.
One interesting plot idea could be the discovery of a hidden power within the Dragon Blade that only Naruto can unlock. This power could be linked to an ancient prophecy. Another could be Naruto teaming up with new characters from the Dragon Blade lore to face a common enemy that threatens both the Naruto world and the world related to the Dragon Blade.
One idea could be a story where the character with blade arms has to protect a hidden village from a new and powerful enemy. Maybe they use their unique blade arms to fend off attacks and discover a secret about their origin in the process.
Well, perhaps the ethereal blade is a gift from a mysterious sage. It can only be used by those with a pure heart, like Naruto. In the fanfiction, Naruto has to prove his worthiness to the blade by going through a series of trials. These trials could involve facing his inner demons and past traumas. And as he overcomes each trial, the blade's power grows stronger within him.
Perhaps the story could revolve around a Raiton master who has lost their memory. As they journey through the Naruto world, they start to regain bits of their past while also teaching others about Raiton techniques. They might have a special connection to a long - lost Raiton - based jutsu that could change the balance of power in the ninja world.
One idea could be Naruto using his pranks to outwit the Akatsuki members. For example, he could set up a series of fake traps that make the Akatsuki waste time and resources. Another plot idea might be Naruto pranking the villagers in a way that actually ends up bringing the community closer together. Maybe he stages a fake emergency that makes everyone realize how much they care about each other.
One interesting plot idea could be the main character mastering a new and unique form of chakra control. For example, being able to combine different elemental chakra in ways not seen before in the Naruto universe.
One idea could be a story where Naruto discovers he has the power to control all the elements in a completely new way. For example, he might combine wind and fire to create a unique attack that no one has ever seen before. Another plot could involve Naruto training with an ancient elemental master who teaches him secrets about the elements that were long forgotten. Maybe Naruto has to use his new elemental skills to stop a powerful enemy who is also an elemental user but is misusing their powers for destruction.
One idea could be the main character, who is a henge master, getting involved in a mission where they have to use their henge skills to infiltrate an enemy stronghold. They could transform into various characters to gather intelligence.