Yes, there are likely fanfictions out there with this concept. The Naruto fandom is quite large and diverse, so many creative and unique ideas get explored in fan - made stories. However, the quality and content can vary greatly from one to another.
Well, Kakashi would likely be very cautious. He would be concerned about the implications of Naruto being with the fem Kyuubi. He would want to make sure that Naruto was not being manipulated in any way. He might keep a close eye on their relationship and offer advice to Naruto when he thought it was necessary. As for the other Konoha 11 members, some might be more accepting. They might see it as Naruto's personal choice and be happy for him if they saw that the relationship was a positive one. But there would also be those who would be hesitant, especially if they thought the fem Kyuubi could pose a threat to the village in the future.
Well, it could be that Fem Naruto has to prove herself to Fem Kyuubi. Maybe there's a prophecy or something that says only by uniting with Kyuubi can Naruto save the village in a new and greater threat. So, Naruto embarks on a journey to understand Kyuubi better. Along the way, they have adventures, meet new characters. Kyuubi starts to respect Naruto for her tenacity and Naruto admires Kyuubi's power. Their relationship evolves and eventually leads to them becoming mates, which also brings about a new era of peace and understanding in the village.
In this kind of fanfiction, Naruto might gain some special powers from the bond with Kyuubi. For example, he could have an even deeper connection to the chakra of the Nine - Tails, allowing him to access new forms or abilities more easily. Also, their relationship could lead to a change in how the village views Naruto. Since the Kyuubi has always been seen as a fearsome and powerful force, Naruto being its'mate' in the fanfic could make the villagers more in awe or even more fearful of him.
In a 'naruto is fem kyuubi's mate' fanfiction, perhaps the story begins with Naruto being drawn to the Kyuubi's chakra in a way he doesn't understand at first. The fem Kyuubi, on the other hand, is intrigued by Naruto's determination and spirit. As the story progresses, they form a bond that goes beyond the normal host - tailed beast relationship. They might have to deal with the reactions of the villagers who are either afraid or in awe of this new development. And together, they embark on a journey to bring a new kind of peace to the ninja world, one that is based on the unity of their unique relationship.
It can be considered popular. Fanfiction is all about exploring different ideas, and this concept is quite out - of - the - box. Some fans are attracted to it because it gives a whole new perspective on Naruto's character and his relationship with the powerful Kyuubi. However, it may not be as mainstream as some other common fanfiction themes like Naruto getting new powers or having different romantic relationships with other characters from the series, but it still has a significant following.
One possible scenario in this fanfiction could be that Naruto's transformation into a fox gives him new abilities related to the Kyuubi's powers. He might be able to communicate with the Fem Kyuubi on a deeper level, leading to an interesting dynamic between them. For example, they could team up to protect the Hidden Leaf Village in a more efficient way, using their combined fox - like skills.
One common theme is power and how the combined power of Naruto and the fem kyuubi is used. Another is acceptance, as Naruto has to accept the fem kyuubi as his mate and vice versa.
One idea could be that the fem Kyuubi starts to show her affection in small ways. For example, she might protect Naruto more fiercely during battles. She could also start leaving little signs of her presence around him, like a soft growl when danger is near that only he can hear. This would build an interesting dynamic as Naruto tries to figure out what these new behaviors mean.
For Fem Naruto, her character development could be centered around acceptance. Accepting her own power, accepting Kyuubi, and being accepted by the village. Her relationship with Fem Kyuubi would be a catalyst for this. She would become more confident and less afraid to show her true self. Fem Kyuubi's development would be about transformation. She was once a feared entity, but with Naruto, she would transform into a more loving and protective figure. This transformation would be gradual, through their shared experiences and the deepening of their bond.