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 a fanfic where Naruto is Itachi's age, a great plot twist could be related to the Nine - Tails. What if, at this age, Naruto had full control over the Nine - Tails and could use its power without the negative side effects? He could use this power to change the fate of the Uchiha clan. He might be able to convince the Uchiha that they don't need to rebel, and in the process, he could become a bridge between the Uchiha and the village. This would rewrite the entire history of the Hidden Leaf and Naruto's role in it.
One possible plot twist could be that Naruto struggles to control Itachi's power at first. Since Itachi's power is very different from his own chakra nature. For example, Itachi's genjutsu abilities might be too much for Naruto to handle initially, leading to him accidentally using it on his friends, causing mistrust among them. Another plot twist could be that the Akatsuki targets Naruto more aggressively, believing he has become a greater threat with Itachi's power. They might send their most powerful members after him, like Pain or Obito. Also, Naruto might discover some hidden secrets about Itachi's power that even Itachi was unaware of, which could change the course of the shinobi world's power balance.
One possible plot twist could be that Naruto, after learning more about Itachi's sacrifices for the village, starts to idolize him in a way that changes his own ninja path. He might adopt some of Itachi's stealthy and strategic techniques. For example, he could focus more on gathering intelligence before acting, rather than his usual head - on approach.
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 possible plot twist could be that Naruto, while modeled after Itachi, has to face off against Sasuke who mistakes him for Itachi at first. This would create a really tense and emotional situation as Sasuke's hatred for Itachi might be misdirected towards Naruto.
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.
A possible plot could be centered around Itachi's illness. Since Naruto is his best friend, he would be determined to find a cure for Itachi. This could lead him on a journey to discover ancient ninja medicine or secrets. Meanwhile, Itachi could be teaching Naruto more about the Uchiha clan and its history, including the secrets of the Sharingan. Their friendship would be a source of strength for both of them, and they would face the challenges of the ninja world side by side, changing the fates of many characters in the process.
A possible plot twist could be that Sakura discovers Itachi's true intentions about the Uchiha Clan massacre much earlier. Since they are the same age, she might be in a better position to understand his motives or even try to prevent it. Another twist could be that Itachi sees Sakura as a potential threat to his plans because of her intelligence and strong will, which could lead to an unexpected conflict between them.
A plot twist could be that they are both chosen for a secret mission that only people of their age can undertake. They have to work together to infiltrate an enemy stronghold. Along the way, they discover a long - lost family connection between them. This revelation changes their relationship and makes them even more determined to succeed in the mission for the sake of their family and the village.
Well, it could start with Naruto being in a tight spot, like surrounded by a bunch of powerful foes. Itachi and Kisame show up out of the blue. Itachi uses his Sharingan to confuse the enemies, while Kisame uses his brute strength. They manage to get Naruto out of there. Then, Naruto might be curious about their motives. Itachi could give some cryptic answers, and Kisame would just grunt. This encounter could lead to a series of events where Naruto, Itachi, and Kisame are involved in a bigger mystery that ties to the secrets of the ninja clans.
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.