A plot twist could be that the transfer of Naruto's eyes to Hinata is part of a grander scheme by an enemy. The enemy believes that Hinata with Naruto's eyes will be easier to manipulate or will cause chaos among their friends. However, Hinata uses this newfound 'gift' to outwit the enemy and prove them wrong.
One possible plot twist could be that Hinata gains Naruto's eyes and with it, some of his memories. This could lead to her understanding Naruto on a much deeper level and perhaps change the way she views their relationship. For example, she might see moments from Naruto's past that made him who he is, and it could strengthen her resolve to be by his side even more.
One possible plot twist could be that an old enemy resurfaces just as they are about to get engaged. This enemy might try to disrupt their relationship by spreading false rumors about Naruto, like he has some hidden dark power that could endanger Hinata. Another twist could be that Hinata's family has some ancient clan secret that surfaces and creates a rift between them and Naruto's side. Maybe the secret is related to a power that the Hyuga clan once had and lost, and they fear Naruto might be involved in its re - emergence in a negative way.
One possible plot twist could be that Naruto discovers a secret conspiracy against Hinata's family while being her bodyguard. Maybe the real threat is not from an obvious enemy but from within the village's own political circles. He then has to protect Hinata not just from physical harm but also from being used as a pawn in this political game.
One of my favorite plot twists in Naruto Road to Ninja Hinata fanfiction is when Hinata gets a power - up that no one expected. It completely changes the dynamic of her character and how she interacts with others. Suddenly, she's not just the shy Hinata we know, but a force to be reckoned with.
One possible plot twist could be that Naruto and Hinata have to quickly learn to control their newfound Jinchuuriki powers. Maybe they are suddenly thrust into a situation where an ancient evil is awakened and only their combined Jinchuuriki abilities can stop it. For example, they might discover that there is a hidden prophecy about two Jinchuuriki working together to save the world.
In some Naruto fanfictions where Naruto hurts Hinata, it could be due to a misunderstanding. Maybe he's under some sort of mind - control or false information has been fed to him. This often leads to a lot of angst in the story.
A possible plot twist could be that the snake eyes are not just a power but also a link to an ancient evil. Naruto initially thinks it's a cool new ability but then discovers he has to fight against the influence of this evil within him.
A possible plot twist in Naruto and Hinata married fanfiction is that they find out there is a prophecy related to their union that affects the entire ninja world. Or perhaps, an old enemy resurfaces and targets Hinata because of her connection to Naruto. This forces Naruto to make difficult choices between protecting the village and saving his wife. Also, there could be a situation where Hinata's family disapproves of something Naruto does as Hokage, creating tension in their marriage.
A great plot twist could be that Hinata is actually related to a powerful Soul Reaper family in the Bleach universe. This could be revealed when she starts to show an unusual connection to spiritual energy. Maybe she has an ancestor who was a Soul Reaper and left a hidden power within her bloodline that only activates when she enters the Bleach world.
One possible plot twist could be that while drunk, Sasuke accidentally reveals his true feelings for Hinata that he has been suppressing. Maybe he starts to talk about how he's always noticed her quiet strength and how it has intrigued him. Another twist could be that Hinata, in her drunken state, challenges Sasuke to a sparring match, which is completely out of character for her normally shy self. This could lead to a newfound respect between them as they see different sides of each other.
One possible plot twist could be that the scythe is actually a cursed weapon. It might start to influence Naruto's mind, making him more aggressive and less like his usual self. This could lead to his friends becoming worried and trying to find a way to break the curse on the scythe.