For Naruto, his mental state would be the driving force for his development. If he's insane, he might initially lash out at the Fem Kyuubi or those around him. But as he interacts more with the Fem Kyuubi, he could start to see things from a different perspective. The Fem Kyuubi might develop by having to adapt to Naruto's instability. She could learn new ways to communicate with him and help him, which in turn would change her own character. For example, she might become more patient and understanding, which is a big change from her more traditional portrayal.
In this fanfiction, Naruto's development would be a rollercoaster. His mental insanity would cause him to make decisions that are out of character. He could go from being a hero - like figure in his own mind to a lost soul, depending on how his relationship with the Fem Kyuubi unfolds. The Fem Kyuubi would develop as she tries to guide Naruto back to some form of sanity. She might have to dig deep into her own nature and find new ways to connect with him. This could involve her showing him memories or emotions that she has, which in turn would also change her understanding of herself and her relationship with Naruto.
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.
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.
For Fem Naruto, her character development could be centered around acceptance. Accepting her own power, accepting Kyuubi, and being accepted by the village. Her relationship with Fem Kyuubi would be a catalyst for this. She would become more confident and less afraid to show her true self. Fem Kyuubi's development would be about transformation. She was once a feared entity, but with Naruto, she would transform into a more loving and protective figure. This transformation would be gradual, through their shared experiences and the deepening of their bond.
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.
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.
In many fanfictions, Fem Naruto might show kindness towards the Kyuubi. This kindness could be something the Kyuubi has never experienced before. For example, instead of just seeing it as a source of power, Fem Naruto might try to understand the Kyuubi's past and pain. This could lead to the Kyuubi gradually opening up to her and them developing a deeper bond.
The relationships could develop gradually. At first, Naruto might be a bit wary of the Fem Kyuubi and Fem Bijuu because they are so different from what he's used to. But as they fight together against common enemies, a sense of trust could start to form. For example, if they save each other's lives in battle, that would strengthen their bond.
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.
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.
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.