The emotional impact would be huge. Naruto has his own identity and dreams. If he becomes Kushina Uzumaki, he might start to have her memories and emotions. He could become more protective over the village in the way Kushina was, but at the same time, he would be losing his own self. This internal struggle between his original self and the new Kushina - self could be a central part of the fanfiction. It could also affect his relationships with his family, like how he relates to his father Minato now that he's in Kushina's form.
One major consequence would be in terms of his abilities. Kushina was known for her powerful sealing techniques. So if Naruto becomes her, he might lose some of his unique Naruto - like skills and instead gain more proficiency in sealing. This could change the way he battles. For example, he might rely more on sealing away enemies rather than his usual Rasengan and Shadow Clone techniques. And his role in the village as a protector might also change as he adapts to Kushina's abilities.
Well, in a fanfiction, it might be due to a curse. There could be a curse placed on Naruto that slowly transforms him into Kushina Uzumaki. This curse could be related to some dark secret in the Uzumaki clan's past. Or perhaps a strange experiment by Orochimaru or another rogue ninja that goes wrong and causes Naruto to take on Kushina's form and some of her abilities.
One aspect to consider in Naruto and Kushina Uzumaki fanfiction is their relationship. Kushina was Naruto's mother. Fanfictions often explore how their bond could have been different if she had survived. For example, she could have taught Naruto more about the Uzumaki clan's secrets. This would have given Naruto an even greater power boost and a deeper understanding of his heritage.
Kushina Uzumaki is significant in Naruto fanfiction as she represents a link to Naruto's past. Her red hair and strong Uzumaki blood are often explored in fan stories. Writers may use her to introduce new plot elements related to the Uzumaki clan.
One consequence could be that he faces opposition from some clan members who might not be ready to accept him as the leader right away. After all, taking over a clan is a big deal.
The most obvious consequence would be the extreme grief among Naruto's friends like Sasuke, Sakura, and Kakashi. They would be devastated and likely seek revenge. The village would also be in chaos as Naruto was seen as a hero - in - the - making. It would completely change the future of the village.
The ninja world would be in shock. Mito Uzumaki was a very important figure in the past. Her revival could bring a lot of ancient knowledge back. For example, she might know some secrets about sealing jutsu that have been lost over time. This could change the balance of power among the villages.
One idea could be a time - travel fanfiction. Naruto Uchiha (assuming it's an AU where Naruto has Uchiha heritage) somehow travels back in time and meets Kushina Uzumaki. They could form an unexpected friendship as he tries to protect her from the events that would lead to her death. He could also use his knowledge of the future to change things in the village for the better.
Kushina Uzumaki was known for her fiery red hair and strong will. She was a Jinchuriki, just like Naruto, which made her both powerful and a target. Her love for her family, especially Naruto, was unwavering. Even though she sacrificed herself early in Naruto's life, her influence on him was profound.
Naruto would likely be deeply hurt, not just physically but also emotionally. He has always idolized his mother, so an attack from her would be a huge blow to his psyche. His trust in family and those close to him could be severely damaged.
One consequence could be a shift in Naruto's character development. Having his mother back might make him more at ease and less driven by his past loneliness. It could also change his relationship with other characters. For example, his bond with his father figure, like Iruka or Jiraiya, might not be as strong as it was when he was motherless. Another consequence could be in the political aspect of the ninja world. Kushina was an Uzumaki, and her return could strengthen the Uzumaki clan's position and influence, which might cause some unrest among other clans who fear the growing power of the Uzumakis.