One interesting plot twist could be when the emotionless character from the fanfic enters the Naruto universe and their lack of emotion makes them impervious to genjutsu. Since genjutsu often plays on emotions, this gives them an unexpected advantage. Another could be a crossover where an emotionless Naruto-like character is created in a different, more dystopian universe, and has to find a way to adapt to the Naruto world's values of friendship and loyalty.
Well, perhaps a plot twist could be the mixing of the two worlds' forms of magic. Naruto's world has its own kind of jutsu - based magic, while High School DxD has demonic and angelic magic. If these magics were to merge in some characters, it would create really unique abilities. For instance, a character could use a jutsu while also having the ability to summon angels or devils. Another interesting plot twist could be that the Nine - Tails (from Naruto) somehow gets involved in the Rating Games in High School DxD. It would be a huge advantage or a major disruption depending on how it's handled. And what if a character from High School DxD learned the Shadow Clone Jutsu? They could use it for all sorts of mischief or strategic advantages in their own world.
A common plot twist is when a Naruto teacher is suddenly made to teach a group of students who are not ninjas at all. For instance, if Kakashi has to teach normal high - school students in a non - ninja world. It completely changes his teaching approach and the dynamic of the story.
In a Naruto and Ben 10 crossover fanfiction, an exciting plot twist could be that the DNA of the aliens in Ben's Omnitrix starts to mix with the chakra in Naruto's world. This could result in new forms for both Ben and Naruto. For Naruto, he might gain the ability to transform into a half - alien, half - ninja hybrid with unique powers. Ben, on the other hand, could find that his alien forms now have chakra - based abilities. This would not only change their powers but also how they interact with their respective worlds and enemies.
In a Naruto - Overlord crossover fanfiction, a great plot twist would be if the Ainz Ooal Gown guild members thought that the Sharingan was a powerful and unknown form of magic. They might try to study it or even recruit Sasuke, who has the Sharingan, into their ranks. This would create a complex situation where Sasuke has to decide between his loyalty to Konoha and the allure of the new and powerful world of Overlord.
One interesting plot twist could be the characters swapping their powers. For example, Naruto's shadow clone jutsu being used by a Fairy Tail mage. This would completely change the dynamics of battles in the Fairy Tail world. Another could be a villain from Naruto teaming up with a dark guild in Fairytail, creating a more menacing threat that both universes have to face together. Also, imagine if the nine - tailed fox somehow got involved in the magic - filled world of Fairytail, it would be a huge disruption and lead to some really unexpected story developments.
Well, a great plot twist could be if the Hokage's hat in Naruto's world is somehow connected to a powerful relic in the Castlevania world. Naruto has to journey through the spooky Castlevania realm to find out how to protect the hat and its power from evil forces. Also, imagine if Alucard from Castlevania has a doppelganger in the Naruto world who is a powerful ninja. When they meet, they initially fight but then realize they have a common goal against a greater evil that is threatening both their worlds. And perhaps the Curse Seal in Naruto could be related to the dark magic in Castlevania, causing Naruto to struggle with a new kind of internal darkness that is different from what he's used to.
One interesting plot twist could be the discovery that the Philosopher's Stone in the Fullmetal Alchemist world has a connection to the chakra system in Naruto. Maybe it could be used to enhance or disrupt chakra flow in a way that no one expected. Another could be a character from Naruto, like Naruto himself, accidentally using alchemy due to some strange cross - world magic. This would completely change the dynamic as he tries to figure out this new power while still having his ninja abilities.
Another plot twist might be a character swap. For example, imagine if Zuko from the Avatar universe was inserted into the Naruto world. His journey of redemption could be paralleled with that of some of the Naruto characters who have also had to overcome their pasts. In the crossover, he could learn ninjutsu and use his firebending in unique ways, creating a whole new set of challenges and relationships.
One interesting plot twist could be that the Godlike Demon character has a hidden connection to Naruto's past. Maybe they are related to an ancient clan that was thought to be extinct. This could change Naruto's understanding of his own heritage and powers.
Well, a great plot twist might be if the Sharingan had a unique effect in the SAO world. For example, it could allow the user to see hidden codes or glitches in the game. And what if some of the SAO bosses were actually jinchuriki - like beings? Naruto would have to use his knowledge of taming the nine - tails to deal with them. Also, if Asuna had some sort of hidden ninja bloodline ability that gets awakened when she meets Naruto, that would be a really cool twist.