The Kyuubi is a nine - tailed fox with a lot of dark and wild energy. In fanfiction, when it comes to Naruto, this energy can manifest in various ways that make him seem like a demon. For one thing, the Kyuubi's chakra can cause Naruto to have an aura that is both menacing and inhumane. His movements might become more animal - like, as if he's being controlled by the primal instincts of the Kyuubi. Additionally, his speech and the way he interacts with others can change. He may become more solitary and less empathetic, which are traits often associated with demons in fictional stories.
It could also be that Naruto fanfiction sometimes gives the Kyuubi more agency or a different perspective. In the original story, the Kyuubi is often seen as a force to be tamed, but in fanfiction, it can be portrayed in more complex and interesting ways. For example, stories where the Kyuubi has its own motives and goals apart from just being a power source for Naruto. This added depth might be appealing to it.
Naruto's usually positive and determined personality could become more aggressive. He might lose his sense of humor and be more focused on power and destruction in his demon form.
Maybe Kyuubi likes fem Naruto fanfiction because it offers a different perspective on the character. A female Naruto could have different emotional responses and interactions compared to the male version, which might be more interesting to Kyuubi.
Well, in certain fanfic concepts, Naruto could control Kyuubi chakra with the help of unique jutsu or seals. For example, he might discover a new sealing technique that allows him to better manage the flow of the Kyuubi's power. This new seal could work in harmony with his own chakra system, enabling him to draw on the Kyuubi's strength without being overwhelmed. Also, some fanfictions might suggest that his strong emotional bonds, like his friendship with his comrades, give him the extra mental fortitude to control such a powerful chakra source.
The fear might be manifested in the Kyuubi's attempts to negotiate with Naruto rather than fight. In fanfiction, the Kyuubi could offer Naruto things or make promises in order to avoid a situation where Naruto uses his power against it. This shows that the Kyuubi is aware of Naruto's strength and is scared of the consequences of going against him.
Naruto might initially be shocked and angry. He has always considered the Kyuubi as an enemy within him, and now being kidnapped by it is the worst - case scenario for him. He could try to fight back immediately, using whatever little chakra he can muster without relying on the Kyuubi's power.
In Naruto fanfiction, Kyuubi can help Naruto by providing him with extra power. For example, it can enhance Naruto's physical abilities like strength and speed during battles. This allows Naruto to face stronger opponents more easily.
At first, Naruto might see the Kyuubi as just a source of power. But as he starts to protect it, he realizes it's more of a partner. Their relationship evolves from a simple user - power source dynamic to a deep - seated friendship. He begins to understand the Kyuubi's emotions and past, which further cements their bond.
In this fanfiction, their relationship becomes more of a partnership. Instead of Naruto just using the Kyuubi's power, they work together as brothers. Naruto might start to understand the Kyuubi's feelings and motives better.
In such fanfiction, their relationship often develops through mutual respect. Naruto no longer sees Kyuubi just as a source of power but as a friend. Kyuubi, in turn, starts to value Naruto's determination and kindness. They might have heart - to - heart conversations in Naruto's mindscape, sharing their past traumas and hopes for the future.