One possible plot twist could be that Naruto's connection to Kurumu reveals a hidden power within him. Maybe it has something to do with a long - forgotten family heritage that Kurumu's family also shares. This could lead to Naruto having to master new abilities that are different from his regular ninja skills.
Well, a plot twist could be that Kurumu's family has been secretly protecting a prophecy related to Naruto all along. As his sister, Kurumu might be in a position where she has to help Naruto fulfill this prophecy, which could involve going against some powerful enemies or even some of their own village's leaders if they oppose it.
One possible plot twist could be that Naruto has some hidden Senju abilities due to his relation to Hashirama. This could change the power dynamics in the ninja world. Maybe he could use Mokuton (Wood Style) more effectively than Yamato. Another twist might be in the political arena. His connection to Hashirama could make him a target or a key figure in disputes between different ninja clans. And it could also change his relationship with Sasuke, as Sasuke might view Naruto's newfound heritage in a different light.
One possible plot twist could be that Naruto discovers some hidden power within himself related to his connection with Anko. Maybe it's a special jutsu that only their family line can use. This discovery could lead him on a new journey to master this power and uncover the secrets of their family's past.
One possible plot twist could be that Naruto inherits some of Shisui's unique abilities. Since Shisui was known for his powerful Sharingan techniques, Naruto might develop a new form of jutsu that combines his own chakra control with the Sharingan - like skills he could potentially inherit. This would make him an even more formidable ninja in the story.
Perhaps the plot twist is that Shisui faked his death not just to protect the village in the general sense, but specifically to keep Naruto safe. He knew of Naruto's importance as the Jinchuriki of the Nine - Tails and his relation to Naruto as a brother. So, he went into hiding and has been secretly guiding Naruto from the shadows all along. This would add a whole new layer to Naruto's journey and the events that have unfolded in the series so far.
Perhaps a plot twist could involve Naruto's parents. If Naruto is Tsunade's little brother, then it might change the story of how his parents met and what their relationship was to Tsunade. Maybe his father was involved in some sort of mission with Tsunade and that's how Naruto came to be. It would also add a whole new layer to Naruto's relationship with Jiraiya, as Jiraiya was also connected to both Naruto's father and Tsunade in different ways.
In this fanfiction, a great plot twist could be related to Percy's origin. What if Percy wasn't really born in the normal way as a god's offspring? He could be a product of some ancient magic that Zeus unknowingly participated in. This revelation could shake the very foundation of the relationship between Percy and Zeus. Also, Percy might discover a hidden side of Zeus' past that Zeus has been trying to keep secret. This knowledge could put Percy in a dangerous position as he decides what to do with this information, whether to expose Zeus or keep it to himself for the sake of their relationship.
One possible plot twist could be that Rin's adoption of Naruto leads to him learning unique jutsu from her early on. Maybe she has some secret knowledge passed down in her family that she imparts to Naruto, which gives him an edge over his peers in the ninja academy.
One possible plot twist could be that the ANBU who raise Naruto secretly train him in forbidden jutsu. This would set Naruto on a path that's different from the original story. He might face more opposition from the village elders who discover this, but it could also make him a more formidable ninja earlier on.
A plot twist could be that Zabuza's past and his relationship with Haku are revealed to Naruto in a different way. This could lead to Naruto having a unique understanding of loyalty and sacrifice. He might then develop his own version of the 'ninja way' that combines the values of the Leaf Village with Zabuza's more self - serving but also protective nature.
One possible plot twist could be that they discover their brotherhood in a very unexpected way. For example, during a dangerous mission, Kakashi might get severely injured and in a moment of delirium, he reveals a long - hidden memory that points to their relation. Naruto, being shocked at first, then realizes it explains some of the strange feelings of connection he had towards Kakashi all along.