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.
Yes. In many Naruto fanfics, Kyuubi plays a significant role. Since it's so closely tied to Naruto, it can easily be made to serve the fanfic. It might be used to introduce new characters who are interested in the Kyuubi's power. Or perhaps the fanfic is set in a different timeline where the Kyuubi has a different relationship with Naruto and has to serve in a way to protect the village or Naruto himself.
In the naruto looks like kyuubi fanfic, a similarity could be in their expressions. When Naruto gets angry or is about to use his power, his facial expressions might mirror those of the Kyuubi. His eyes could narrow in a very fox - like way and his teeth might seem a bit more prominent, like the Kyuubi's fangs. Additionally, in terms of combat style, Naruto could incorporate some of the Kyuubi's natural instincts. For example, he might be more likely to attack from unexpected angles, just like a fox would when hunting.
Their relationship could also grow through mutual respect. The female Kyuubi respects Naruto's strength and determination, and Naruto respects her power and the fact that she has been trapped for so long. This respect can lead to a friendship or even something more as they rely on each other more and more in difficult situations.
One common theme is power. How Naruto harnesses the Kyuubi's power and grows stronger. Another theme is friendship, as the relationship between Naruto and the Kyuubi can be seen as an unusual form of friendship. And there's also the theme of redemption, like when the Kyuubi tries to make up for its past misdeeds.
Well, Kyuubi could help in Naruto fanfic in several ways. It might offer its wisdom to Naruto. Since it has lived for a long time and has seen a great deal, it can give Naruto insights about the history of the ninja world, hidden techniques, or the true nature of certain characters. Also, its presence within Naruto can act as a deterrent to some villains who fear the power of the nine - tailed fox.
One way is by being a power source. For instance, Naruto could draw on Kyuubi's power in new and creative ways in the fanfic. Another way is through its backstory. The fanfic could explore the Kyuubi's past and how it relates to Naruto's present situation, thus serving the plot. Also, Kyuubi could be used as a catalyst for character development, like Naruto learning to better control it and growing as a result.
Well, the Kyuubi might use its chakra to soothe Naruto's emotional pain. It could send warm waves of its powerful chakra through Naruto's body, making him feel more at ease and less heartbroken.
I'm not sure specifically as it could be a very niche or fan - created story. It might involve a male Kyuubi character in some sort of situation related to Naruto, perhaps a unique or alternative take on their relationship in the Naruto universe.
A 'naruto ganbanged kyuubi fanfic' could potentially be about Naruto and the Nine - Tails (Kyuubi) forming an unexpected and deep bond. Maybe Naruto discovers new powers within the Kyuubi that no one else knew about, and they work together to face new threats in the ninja world. This could involve Naruto learning to control the Kyuubi's power in a more refined way and using it to protect his village in unique ways.