No. In the Naruto series, Naruto is the host of the Kyuubi, not its slave. Fanfics might deviate from the original concept, but in the official story, Naruto has a symbiotic relationship with the Kyuubi. He gains power from it and eventually befriends the Kyuubi spirit.
No. Naruto and Kyuubi have a complex relationship. While Kyuubi was initially sealed within Naruto, Naruto gradually gains control over Kyuubi's power and they develop a more symbiotic relationship. Fanfictions that depict Naruto as Kyuubi's slave are likely straying far from the original themes of growth and friendship in the Naruto story.
I'm not sure if it's popular. There are so many Naruto fanfictions out there that it's hard to tell which ones are popular and which ones aren't. It could be a niche idea that only a small group of fans are interested in.
I'm not really sure as I haven't read that specific fanfiction. But generally, in Naruto fanfictions, if Naruto is the 'fem Kyuubi's slave', it might involve some sort of power dynamic where the female version of the Kyuubi has some control over Naruto. It could be a really strange or unique take on the Naruto universe, exploring different relationships and character developments that are far from the original storyline.
If Naruto is Kyuubi's slave in fanfiction, it completely changes the power dynamic. Naruto would be at the mercy of Kyuubi's will, which is against the idea of Naruto's growth and self - determination in the original story. It could lead to a very dark and oppressive narrative where Naruto has no freedom.
It's likely to be a controversial concept. In the Naruto series, the relationship between Naruto and Kyuubi is complex. Kyuubi was initially a force of destruction sealed within Naruto, but over time they developed a more symbiotic relationship. Making Kyuubi Naruto's slave goes against the essence of their growth and mutual understanding in the original story. So it would probably be frowned upon by many fans who respect the original narrative.
Another consequence could be in his relationships with his friends. Some of his friends might be uncomfortable with the idea of Naruto having the Kyuubi as a slave. They may worry that this new - found power will change Naruto for the worse. However, Naruto could also use this power to better protect his friends and the village. But overall, it's a complex situation that could have far - reaching effects on Naruto's character development and his place in the ninja world.
It re - imagines it as a more complex relationship. Instead of just being a host and a tailed beast, Naruto has to deal with Kyuubi as a slave, which adds a whole new layer of moral and emotional complexity.
Perhaps Naruto, through his unwavering belief in his own ninja way and his continuous training, reaches a new level of spiritual connection with the Kyuubi. This connection is so profound that he can influence the Kyuubi's very essence. He may use his positive energy and the respect he has gained from the Kyuubi over time to make the Kyuubi follow his commands, as if it were his slave. It's all about the power of their relationship and Naruto's growth as a ninja.
One reason could be a misinterpretation of the Naruto - Kyuubi relationship. If a writer doesn't fully understand the journey of Naruto and Kyuubi towards mutual respect and cooperation in the original story, they might come up with this idea. Another possibility is that they are trying to create a new and edgy storyline that caters to a niche audience who likes to see extreme power imbalances in fanfiction.