One possible fanfiction could involve Naruto learning a new technique that accidentally weakens the Kyuubi's seal, leading to a partial release of its power. This could put the Hidden Leaf Village in danger as Naruto struggles to regain control.
In a fanfiction scenario, Naruto might be forced to release the Kyuubi's seal in order to defeat a powerful enemy. However, this comes with the risk of losing himself to the Kyuubi's power. He could then have to rely on his friends to bring him back to his senses.
Another aspect in such fanfictions could be the origin of the Kyuubi seal. Some writers might delve into ancient ninja secrets and forgotten jutsu that were used to create the seal in the first place. They might also explore if there were other possible ways to seal the Kyuubi that were considered but not used. This can add a whole new layer of mystery and intrigue to the Naruto universe.
One potential consequence could be widespread destruction. The Kyuubi is an extremely powerful force. Buildings would likely be demolished, and many shinobi might be injured or killed trying to combat it. Another consequence could be a shift in the power dynamics within Konoha. Some might see Naruto as a threat, while others might try to use this situation to gain power themselves.
Some fanfictions focus on the idea of a different kind of seal being used on the Kyuubi. Maybe a more humane or symbiotic seal that allows Naruto to fully utilize the Kyuubi's power without the negative side effects. This can lead to a whole new Naruto, one who is more in control and perhaps even more powerful than in the original story.
One interesting aspect in Naruto's Kyuubi transformation fanfiction could be exploring the internal struggle Naruto has when the transformation starts. He's constantly fighting the raw power of the Kyuubi while trying to use it for good. In some fanfictions, the transformation is not just a physical change but also a mental one, where Naruto has to face his darkest fears and insecurities that are amplified by the Kyuubi's chakra.
One possible fanfiction could be about Naruto learning to fully control the power of his Kyuubi - enhanced eye. He might discover new abilities like seeing through illusions more easily or being able to project his chakra in a more powerful way through his eyes. This could lead to him having an edge in battles against tough opponents.
The release of the Kyuubi could also attract other threats. Enemies from other villages or dark forces might see this as an opportunity to either steal the Kyuubi's power or take advantage of the chaos in the Hidden Leaf. Naruto, while dealing with the Kyuubi's power, would also have to face these external threats. His journey could involve learning to master the Kyuubi's power in a way that protects the village instead of endangering it.
Perhaps the Fem Kyuubi sees potential in Naruto that can only be fully realized once the seal is removed. She may believe that the seal is holding Naruto back from reaching his true strength. And she wants to see Naruto reach his full potential not just for his sake, but also because she has developed a sort of attachment to him during their time together while still being sealed.
One possible fanfiction could be about how Naruto's released pheromones unknowingly affect his friends and comrades. For example, it might make them more protective of him or more in tune with his emotions. Another could be that the pheromones attract a particular enemy who is sensitive to such things and it leads to a unique battle scenario.
In a fanfiction, Naruto might release his chakra power during a time - travel adventure. Imagine he goes back to the era before the ninja villages were established. His chakra power would be seen as something extremely strange and powerful. He could use it to protect a group of early ninjas from a powerful, unknown threat, and in the process, he might accidentally change the course of ninja history by teaching them new ways to use chakra based on his own knowledge.
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.