Naruto, with his mental insanity, would likely develop in a very erratic way. His actions might be unpredictable as he tries to come to terms with his own mind and the presence of the Fem Kyuubi. The Fem Kyuubi, on the other hand, could start off as a more stable entity but gradually be influenced by Naruto's insanity. Maybe she becomes more empathetic towards his situation.
One possible plot twist could be that Naruto's mental instability causes him to misinterpret the Fem Kyuubi's intentions. Maybe he sees her as a threat when she's actually trying to help him. This could lead to a lot of internal conflict within Naruto and also create tension in their relationship.
Well, for one thing, it allows for a fresh take on the Naruto universe. The insane aspect of Naruto can lead to different plotlines compared to the traditional Naruto stories. And the Fem Kyuubi adds an extra layer of intrigue as she has her own set of powers and personality traits. Their relationship can be explored in ways that are not possible in the original series, like how they might interact during battles or how they come to understand each other on a deeper level. It gives writers a chance to be really creative and come up with new story arcs and character developments.
The key elements often include a reimagined Naruto with 'insane godlike' abilities. This could lead to a more dominant role for Naruto in his relationship with the Fem Kyuubi. Their relationship itself is a major element. It might not be a typical friendship or partnership but something more complex, perhaps with elements of mutual respect and dependence. The fanfiction may also explore how the Fem Kyuubi's nature affects the story. As a nine - tailed fox, she has a lot of power and a certain wildness. In this fanfiction, that could be both a source of conflict and a strength when combined with Naruto's abilities.
Another option is to ask in Naruto - related fan groups on social media platforms. People in these groups are often very passionate about Naruto and may be able to point you to some good insane Naruto x Fem Kyuubi fanfictions.
Perhaps in the fanfiction, some sort of dark magic or curse has been placed on Naruto. This could be messing with his mind and causing him to act in an insane manner. It could be a way for the author to introduce a new and dark plot element to the story. Another cause might be that he has been betrayed by those he trusts the most, which shatters his mental state.
The fem Kyuubi could be initially attracted to Naruto's struggle with the Kyuubi inside him. She decides to help him. As Naruto's mental state improves due to her efforts, they could develop a romantic relationship. For example, she could teach him how to better control the Kyuubi's chakra, and in the process, they fall in love.
One great fem Naruto x fem Kyuubi fanfiction could be one that focuses on their unique bond. It might explore how they interact in a world where Naruto is female and the Kyuubi also takes a female form. For example, it could show them teaming up against common enemies and how their combined powers are different from the original story.
Maybe Naruto's mental instability is a result of suppressing the Kyuubi for so long. The fem Kyuubi fanfic could explore how she tries to break through his mental barriers. She could use her own unique connection to the Kyuubi's power to reach Naruto on a subconscious level. This could lead to a series of adventures where Naruto has to face his inner demons with her help.
The insane godlike Naruto can completely transform the story. His enhanced powers mean he can take on greater challenges. For instance, he might be able to face off against stronger villains without hesitation. In relation to the Fem Kyuubi, he could have a more confident approach in their interactions. He's not the meek Naruto from the start of the original series. This new Naruto can also change the pacing of the story. Since he's more powerful, events might unfold more quickly as he's able to make bolder moves.