A really interesting plot twist could be that Itachi fakes his death at Naruto's hands. He then secretly works behind the scenes to help Naruto defeat the real threats to the ninja world. This would completely change the dynamic of the story and add an element of mystery.
One interesting plot twist could be that since they are the same age, they become rivals not just in power but also in terms of winning the affection of their peers. Naruto, with his boisterous and friendly nature, and Itachi, with his cool and mysterious aura, both vying for the same friends. Another could be that they end up in the same ninja team, which is unheard of in the original story. This would force them to work together and learn from each other's strengths, like Naruto teaching Itachi about the power of friendship and Itachi teaching Naruto more refined ninjutsu techniques.
One interesting plot twist could be that the pregnancy was a result of some sort of magical or forbidden jutsu gone wrong. Maybe a villain was trying to use Naruto or Itachi for an experiment and it led to the unexpected pregnancy. This would add a layer of mystery and danger to the story.
One interesting plot twist could be that Naruto doesn't immediately accept Sakura's confession. He might be in shock and need time to process his feelings. This could lead to a period of awkwardness between them. Another plot twist could be that Sakura's confession is part of a mission or a ploy to protect Naruto from a greater danger. For example, she might be trying to draw out an enemy who is targeting Naruto.
One interesting plot twist could be that Naruto gets the Rinnegan not through his own power, but as a result of a sacrifice by an unexpected character, like a long - lost Uzumaki relative. This relative could have been secretly protecting Naruto all along and in a moment of great danger, transfers their Rinnegan - like power to him.
A great plot twist could be that Lucoa is actually related to one of the tailed beasts in the Naruto world. Maybe she has some ancient connection that no one knew about. This would completely change the dynamics of their relationship and the story.
One possible plot twist could be that Naruto, despite being trained by Shisui and Itachi, struggles with the darker aspects of their teachings. For example, he might find it hard to adapt to their more stealthy and sometimes morally ambiguous tactics. Another twist could be that an enemy figures out Naruto's new training sources and uses it against him by setting traps based on the Uchiha's fighting styles. Also, Naruto could discover a hidden connection between the Uchiha clan and his own Uzumaki heritage during the training process that changes his perspective on his powers and destiny.
One possible plot twist could be that Naruto, being at Itachi's age, has already mastered some of the more advanced jutsu much earlier. For example, he might have learned the Sharingan - like abilities through some unique encounter, which would completely change the power dynamics in the Hidden Leaf. This would also lead to a different relationship with Sasuke, as Naruto would be more of an equal in terms of power and mystery.
In some 'naruto batman fanfic', a plot twist could be that Naruto's chakra is somehow linked to the power source of Batman's technology. So when Naruto is in danger, it affects Batman's gadgets. This unexpected connection changes the way they fight together and adds a new layer of complexity to their relationship.
Well, a great plot twist could be that Akatsuki is actually being controlled by a greater evil force that neither Naruto nor Itachi knew about. When they join, they start to notice strange behavior among the members that doesn't seem to align with the original goals of Akatsuki. Naruto, with his unwavering belief in friendship and Itachi's strategic mind, might then team up to expose this greater threat and save the ninja world. It would also be interesting if their joining Akatsuki causes a rift among the members, some seeing them as potential allies and others as enemies.
One possible plot twist could be that their marriage causes a rift in the ninja world. Some might oppose it due to Itachi's past actions. Another could be that they discover a new power that comes with their union, which is crucial in saving the world from a new threat. And perhaps they have to deal with family issues, like Naruto trying to make Itachi feel welcome in Konoha despite his past.