Perhaps in the fanfiction, Sasuke turns out to be a double agent for an even greater threat that no one expected. This would turn the whole 'Naruto and Sasuke's relationship' on its head. Also, the discovery of a new type of chakra that is both powerful and dangerous could be a major plot twist. It could force all the characters to re - evaluate their fighting styles and alliances.
One of the most exciting plot twists could be the return of a long - thought - dead character with new powers. Maybe a villain from the past comes back stronger and with a different motive, like Orochimaru returning with a new form of immortality technique. Another could be Naruto suddenly losing his powers and having to find a new way to fight, which would completely change the dynamics of the story.
One of the most exciting plot twists could be a character who was thought to be a villain turning out to be a hero all along. For example, in some fanfictions, a Sith - like character might actually be working undercover to save the galaxy. Another great twist could be a major character's unexpected death that changes the whole course of the story. It shakes up the familiar Star Wars universe we know and forces other characters to step up in new ways.
Well, one of the most interesting plot twists could be a character that was thought to be on the side of the humans actually being a secret agent for the Titans all along. This would completely change the dynamic of the story and the relationships between the characters.
One exciting plot twist could be a character from the Naruto universe who travels back in time to the Jedi universe and discovers they are actually a long - lost Jedi descendant. This completely changes their understanding of their own powers and heritage.
One exciting plot twist could be that Naruto discovers a new, ancient form of chakra that no one has ever seen before. This new chakra gives him powers far beyond what he already has, allowing him to defeat enemies with ease. Another could be that all the tailed beasts suddenly merge with Naruto, not just the Nine - Tails. This would make him an incredibly powerful force in the ninja world.
Perhaps a major plot twist could be that the tailed beasts in Naruto are somehow connected to the Mother Boxes in the Justice League world. When the Mother Boxes start acting up, it's because the tailed beasts are influencing them. This would force the Justice League and Naruto's friends to work together to figure out how to stop the chaos. Another plot twist could be that the Justice League members are transported to the Naruto world and have to adapt to the ninja way of life, and in the process, they discover new powers within themselves. And finally, if Naruto was able to summon a Justice League member as a summon, like if he could summon Superman instead of a toad, that would be a wild and unexpected plot twist.
A really cool plot twist could be that the Rinnegan in Naruto is not a normal one. It has a hidden power that was sealed away by the Sage of Six Paths long ago. As Naruto unlocks this power, he realizes it's linked to a prophecy that he initially didn't understand, and it changes his whole perception of his role in the ninja world. This would involve a lot of self - discovery and new challenges for Naruto.
One interesting plot idea could be Naruto's son, Boruto, facing a new and powerful enemy that has ties to an ancient evil from the past that was thought to be sealed away long ago. This enemy could be manipulating the new generation of shinobi in the Hidden Leaf Village, causing chaos and mistrust among them.
One exciting plot twist could be Naruto obtaining the power to use the Dragon Balls in a unique way. Maybe he uses his chakra to unlock a new level of power within the Dragon Balls that no one in the DBZ universe has ever seen. Another could be a fusion between Naruto and Goku, creating a super - powerful being with Naruto's ninja skills and Goku's Saiyan powers. And perhaps there's a plot twist where the villains from both universes team up against the combined might of Naruto and DBZ heroes, forcing them to find new and creative ways to fight back.
A great plot twist could be that they time travel into the bodies of their younger selves but with their current godlike powers. They then have to deal with the reactions of their friends and family who don't understand what has happened to them, while also trying to use their new - found situation to prevent some future disasters.
Perhaps the future holds a time when the Cullens' secret of being "vegetarian" vampires is out and they are either revered or despised for it. This could completely change their standing in the vampire world and how they interact with others in the future. They might have to fight for their way of life all over again.