For some fans, it's the novelty of it. It goes against the norm of the original Naruto story, and that's appealing. They like to see how the characters can be reimagined in a completely different light.
It's mainly a fanfiction concept. In the original Naruto story, Kushina is Naruto's mother. Their relationship is that of a mother - son, which is a fundamental and established part of the Naruto lore. The idea of Naruto falling in love with Kushina goes against the natural family dynamic and the intended narrative of the series. However, in the realm of fanfiction, people can explore such unconventional relationships by changing the rules and creating alternate universes where different scenarios can play out.
Sometimes other characters like Minato might also be involved. Minato could be a part of the backstory, especially since he was Kushina's husband in the original story. His presence in the fanfiction can add an extra layer of complexity, like Kushina having to deal with her past feelings for Minato while falling for Naruto. Also, characters like Jiraiya could be included as Naruto's mentor, and his influence on Naruto could be a factor in Kushina's attraction to Naruto.
Another plotline might involve Kushina being brought back to life and getting to know Naruto as a young man. As she spends time with him, she discovers his determination and the way he has grown despite his hardships, which makes her develop feelings for him. For example, she could see how he interacts with his friends and how he's always there to protect them, and that could draw her to him.
Sure, there probably is. Fanfiction thrives on creativity and exploring different relationships and scenarios. A story about Vampire Naruto and Kushina falling in love could be a very creative and engaging piece. Some fanfiction writers like to blend different genres or concepts, like vampires into the Naruto world. So, it's very possible that such a fanfiction exists. You could try using specific search terms on fanfiction platforms to locate it.
Many fanfictions explore Naruto's discovery of his mother Kushina's love. Since he grew up without her, when he finally learns about her through memories or other means in fanfictions, it creates a deep emotional impact. The love can be shown as something that gives Naruto more strength and purpose. For example, in some stories, he realizes how much she sacrificed for him and it makes him even more determined to protect the village she loved.
In a fanfiction, Naruto discovers old letters from Kushina that were hidden away. As he reads them, he gets to know a more personal side of his mother and feels an even stronger bond of love towards her. It's a story of connection through words and memories.
In a fanfiction, perhaps Kushina was able to leave a part of her chakra within Naruto when she died. This chakra has memories and emotions of her love for him. As Naruto gets stronger and faces difficult battles, this chakra activates and gives him not only power but also the feeling of his mother's love, which heals his emotional wounds and gives him the motivation to keep fighting.
Another aspect could be that the fanfiction delves into how Kushina's presence affects Naruto's relationships with others. For instance, his relationship with Sasuke could be different. With a strong maternal figure in his life, Naruto might be more stable emotionally and be able to approach Sasuke in a more understanding way, which could potentially change the whole dynamic of their rivalry and friendship.
There are indeed some great ones. These fanfictions usually build on the strong bond between Sasuke and Naruto from the original story. They might show Sasuke gradually realizing his love for Naruto through different scenarios like when they are on a mission together or during a moment of self - reflection.