Another plot twist might be that the Fuinjutsu Naruto is learning in Kumo is somehow connected to an ancient evil. As he delves deeper into the art, he unknowingly starts to awaken this evil, and he has to find a way to stop it while still mastering the sealing techniques.
Perhaps Naruto's ability to learn Fuinjutsu quickly makes him a target in Kumo. There could be a group within the village that wants to use his skills for their own dark purposes, creating a conflict for Naruto between loyalty to the village and his own moral compass.
A plot twist could be that Naruto's Fuinjutsu skills are actually part of a prophecy in Kumo. The village initially hid this from him, but as he progresses in learning, he discovers the truth and has to deal with the implications.
One possible scenario in such a fanfic could be that Naruto's upbringing in Kumo gives him a different perspective on chakra control, which aids him in learning Fuinjutsu. He might be trained by Kumo's elite ninjas who are experts in sealing techniques.
One possible plot twist could be that Naruto discovers a hidden aspect of the Hiraishin no Jutsu. For example, it might have a connection to an ancient Uzumaki clan ability that no one knew about. This could lead to Naruto being able to use it in ways that Minato, his father, never did.
One possible plot twist could be that Naruto's unique way of raising the Sannin changes their personalities completely. For example, Jiraiya might become more reserved and studious under Naruto's influence. Another could be that the Sannin end up teaching Naruto secrets that were lost in the original timeline. Maybe Tsunade reveals a new form of medical ninjutsu that Naruto then uses to save many lives in future battles. Also, Orochimaru might turn away from his dark path earlier, leading to a different power structure in the shinobi world.
A plot twist could be that Naruto discovers a long - lost connection between the Nine - Tails and some ancient power in Kumo. This could change the whole dynamic of his capture situation. Instead of being a victim, he might become an important figure in Kumo's internal power struggle. And this new - found connection could also lead to a new alliance between Konoha and Kumo in the end. Another twist could be that Naruto's capture was a ruse by Konoha's higher - ups to gain some secret knowledge in Kumo. Naruto was sent there on purpose, but things start to go wrong when Kumo figures out the plan.
A really interesting plot twist could be that Zabuza has a hidden past or connection to Naruto's family. For instance, perhaps he knew Naruto's father in a different context than what was previously known. This could change Naruto's whole perspective on his family and his place in the ninja world. Or, Zabuza could have been given a secret mission long ago related to Naruto that he never fully completed, and now raising Naruto becomes a way to fulfill that mission. This would add a whole new layer of mystery and depth to the fanfic.
One possible plot twist could be that Naruto develops unique jutsu influenced by Yugito's Nibi powers. Since Yugito is a jinchuriki, she might teach Naruto some special techniques related to chakra control and dealing with tailed beasts. For example, Naruto could learn a new form of Rasengan that incorporates some of the Nibi's chakra nature.
One possible plot twist could be that Naruto discovers he has a natural affinity for a special type of metal that is only found in a hidden realm. This metal has unique properties that can enhance his ninja tools in unexpected ways. Another could be that the smithing skills he learns are actually part of an ancient prophecy. It was foretold that a ninja with Naruto's spirit would master smithing to create a weapon that could save the ninja world from a great threat that is yet to come.
One possible plot twist could be that Naruto's ninja skills are enhanced in a unique way due to Aphrodite's influence. Maybe his charm becomes a weapon, like he can disarm opponents just by using his new - found allure. Another could be that Naruto has to face the wrath of other gods who don't like Aphrodite interfering in the mortal world in this way.
One possible plot twist could be that Naruto develops Uchiha - like abilities early on. Since the Uchiha are known for their Sharingan and powerful fire - style jutsu, Naruto might accidentally awaken a form of Sharingan - like power due to being raised in an Uchiha - influenced environment. This could cause a stir in the ninja world as it goes against the normal development of a Jinchuriki.
A really interesting plot twist could be in the area of Naruto's chakra nature. Zetsu has some strange abilities related to plants and the earth. So, Naruto, being raised by Zetsu, might develop a new type of chakra nature that combines his own wind nature with something more related to earth or plant - like. This would make his jutsu look very different. For example, his Rasengan could be infused with some kind of plant - based energy that not only causes damage but also has some sort of healing or growth - promoting effect on the surrounding area. And his relationships with other characters would be different too. Since he's been raised by Zetsu, he might be more of an enigma to his peers in the Hidden Leaf Village, and they might be more suspicious of him.