One possible plot twist could be that Naruto develops a much darker and more ruthless side due to Zabuza's influence. Instead of the optimistic and friendly Naruto we know, he might be more solitary and calculating in his approach to battles and relationships. For example, he could be more willing to use underhanded tactics like Zabuza's use of hidden mist jutsu to ambush opponents.
Naruto's training would likely be more intense and survival - based. Zabuza was a tough and unforgiving trainer in his own right. He might push Naruto to his physical and mental limits from a young age, making Naruto more resilient in combat. For instance, instead of the relatively structured training in the Hidden Leaf, Naruto could be thrown into real - life combat situations early on to learn quickly.
One possible plot twist could be that due to Zabuza's influence, the female Naruto becomes more of an assassin - type. She might develop a different set of values compared to the original Naruto. For example, she could be more ruthless in combat and less hesitant to take lives when necessary.
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.
His personality would likely be a mix of Zabuza's stoicism and his own inherent determination. He might not show his emotions as freely, but deep down still have that strong will to prove himself. He could also be more distrustful of others at first, having grown up with Zabuza who is a bit of a loner. However, as he gets older, he might start to break out of that shell and show more of his true, kind self.
A third plotline could be that Fem Zabuza is a time - traveler. She travels back in time and meets a young Naruto. She decides to train him, seeing his potential. As they train together, a bond forms between them. But her presence in the past also starts to change the future in unexpected ways, and they have to deal with the consequences while also exploring their relationship.
One common theme is the idea of redemption. Zabuza, being a former assassin, often has a journey towards redemption in these fics, and fem Naruto can be a part of that journey, either by inspiring him or being directly involved in his change. Another theme is the exploration of a different kind of relationship. Since Naruto is female in these fics, it creates a new dynamic that is different from the original Naruto - Zabuza interactions in the anime or manga.
Zabuza could be quite cold to Naruto at the beginning. He's not exactly the warm - and - fuzzy type. But when Naruto shows his skills and tells his story of being banished unjustly, Zabuza might empathize on some level. He might not show it openly, but he could start to protect Naruto in his own way, perhaps because he sees a bit of his younger self in Naruto who was also wronged by the ninja system.
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.
Fem Naruto's appearance would change in several ways. Her body shape would be more feminine, with curves. Her eyes might be a bit larger and more expressive. In terms of hair, not only would it be long, but she could also style it in different ways, like braids or ponytails. And her skin tone might be a bit fairer compared to Naruto. She would also have a more slender build overall.