It could mean that Naruto has a more powerful and mysterious heritage. His abilities might be even more special than previously thought.
He might be shocked at first. Naruto has always had a complex relationship with the Kyuubi, so finding out his mother is somehow related to it would turn his world upside down. He would probably have a million questions running through his head and would need time to process such a huge revelation.
One implication is that his power levels would be off the charts. Since the Kyuubi is an extremely powerful entity, Naruto would have a whole new set of abilities.
One implication could be that Naruto has a stronger connection to the Kyuubi's power from the start. Since it's his mother, he might be more in tune with the fox's chakra and abilities. For example, he could learn to control it more easily without having to go through as much struggle as in the original story.
The implications are far - reaching. For starters, the emotional connection between Naruto and Kyuubi would be different. In the original, it was a complex relationship of mutual need and struggle. As a pet, Kyuubi might become more of a source of comfort for Naruto. This could also affect how Naruto approaches his own identity. He might see himself more as a caretaker or protector, which could influence his decisions in the fanfiction world. Also, the relationship might open up new plotlines related to how Kyuubi's presence as a pet affects the village's perception of Naruto and their safety concerns.
One implication is enhanced power. He could potentially have greater control over the Kyuubi's chakra and use it more effectively. For instance, he might be able to transform into a more powerful form.
One implication could be a shift in the power balance. If Naruto is seen as a pet, it might suggest that he has less agency and is more under the control of the Kyuubi. This could lead to interesting story developments where Naruto has to break free from this 'pet' status to regain his true power.
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.
In some fanfictions, Naruto's mother, Kushina, has a special connection with the Kyuubi. For example, some stories might explore how Kushina's chakra influenced the Kyuubi's behavior. Since she was the Jinchuriki before Naruto, her relationship with the Kyuubi could be a rich source of plot development in fanfiction.
One implication could be a change in Naruto's power source. If he's the Kyuubi's son, his access to the Kyuubi's chakra might be more natural and innate. He might not have to struggle as much to control it as he did in the original story.
If Naruto is Kyuubi's son in fanfiction, it could mean that Naruto has some innate powers directly related to the Kyuubi. He might not need to struggle as much to control the Kyuubi's power as in the original story.