Well, it could be about a version of Naruto who has a dark side believing that he is the Kyuubi. Maybe in this fanfic, his self - identity gets all muddled up with the power and nature of the Kyuubi, leading to some really interesting and dark character developments.
Well, if Naruto thinks he's the Kyuubi in a fanfic, he would probably start to exhibit more of the Kyuubi's traits. He might become more aggressive and less patient. His appearance could also change, maybe having some Kyuubi - like features all the time. And his training would take a whole new turn, as he'd be trying to master the power he believes is his own, which is really the Kyuubi's.
Searching on specialized Naruto fanfic platforms is a good idea. Some smaller, Naruto - centric fanfic sites might also have it. You can also reach out to other Naruto fans on social media platforms like Twitter or Facebook groups dedicated to Naruto. They might be able to point you in the right direction or might even have a copy of the fanfic themselves if it's not widely available on the usual fanfic websites.
In this fanfic scenario, Naruto's character development would be complex. Initially, he would be in denial or disbelief about being the Kyuubi. But as he experiences things like the power surges and the reactions of others, he would start to accept it. His relationships would be strained as some may fear him. But through these challenges, he would develop a stronger sense of self. He would have to re - evaluate his goals and values, and in the process, become a more complex and interesting version of himself. For example, he might start to see the world from the Kyuubi's perspective, which would give him a new understanding of the balance between power and restraint.
Maybe it's because Naruto has some sort of special connection or resemblance to the Kyuubi that Kushina notices. For example, Naruto might display some of the Kyuubi's power characteristics in an obvious way that makes Kushina jump to that conclusion.
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.
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.
Well, Kyuubi might be possessive of Naruto because they have a unique bond. Kyuubi has been inside Naruto for a long time. They've shared experiences, and Kyuubi may see Naruto as its own in a way. Also, Naruto has sort of tamed Kyuubi to an extent, and this might make Kyuubi feel like Naruto is special to it, so it shows possessiveness.
On the positive side, some might see Naruto as a powerful asset. Since the Kyuubi is extremely powerful, if they believe Naruto is the Kyuubi, they could try to use his power for their own good. However, this also means they might not see Naruto as an individual with his own feelings and will. His relationships would become more about what he can do for others rather than true friendship.
One great Fem Naruto Kyuubi fanfic is 'The Nine - Tailed Fox's New Host'. It explores how a female Naruto deals with the power of the Kyuubi in a unique way. The story focuses on her training and how she overcomes various challenges with the help of the Kyuubi's power.