Character development is a major element. As the story progresses, we might see Naruto either getting better or worsening in his insanity, and Kushina evolving in her approach to deal with him. There could also be other characters' reactions to this unusual relationship, which can further shape the story. For instance, Minato's spirit watching over them and how his presence (even if just in memory) affects how Kushina and Naruto interact.
One popular Kushina x insane Naruto fanfiction could be 'A Mother's Love Beyond Reason'. It explores a rather unique take on their relationship where Naruto's insanity leads to some very different interactions with his mother Kushina. It delves deep into how Kushina tries to understand and help Naruto despite his mental state.
In this type of fanfiction, the story could also focus on how the village might react differently to Naruto. Without Kushina's presence, which could potentially have been a positive influence, Naruto might face more hostility. His struggle to fit in and gain acceptance could be more arduous, and this could be what drives him to the brink of insanity. Maybe he would develop a more jaded view of the world and the people in it.
Well, she could start by correcting the out - of - character portrayals. For example, if Naruto is written as overly cruel in the fanfiction, Kushina, as his mother, would know his true kind - hearted nature and rewrite those parts to be more in line with his real personality. She could also fix the plot holes. Maybe in the fanfic, some events don't make sense in the Naruto universe. Kushina, with her knowledge of the world, could fill in those gaps and make the story flow more smoothly. Another thing she could do is to improve the power scaling. If characters are given powers that are way too OP or too weak compared to what they should be in the Naruto series, Kushina could adjust those to make it more believable.
She could also be amused in some cases. If the fanfiction has some really out - there but harmless ideas about Naruto, like him having a strange hobby that doesn't really change his fundamental good nature, Kushina might find it funny and just shake her head at the creativity of the fanfiction writer.
Kushina's strong - willed and loving nature can be used to fix the fanfiction. Her love for Naruto and the people around her can be a guiding force. For example, if the fanfic has a negative or wrong view of family relationships in the Naruto world, Kushina can correct it. Since she is a part of the Uzumaki clan and has her own backstory, she can bring authenticity to the fanfic. She can make sure that the fanfic respects the heritage and values of the Uzumaki clan, which might be misrepresented in some insane fanfictions.
Well, one scenario could be that Kushina finds a fanfiction where Naruto has turned evil due to some dark force. Another might be that she discovers a story where Naruto is in a relationship that is completely out of character for him. Maybe she stumbles upon a fanfiction where Naruto has some really strange and overpowered abilities that don't fit the original Naruto universe.
Well, in such fanfictions, one characteristic could be a very different take on the characters. Anko might be involved in a story where Naruto's 'insane' side (which could be interpreted in various ways like extreme power, a broken mental state etc.) is explored in relation to her. Maybe it shows a darker or more complex relationship than what is shown in the original Naruto series.
There might be a fanfiction where Kushina's backstory is explored in a more in - depth and 'insane' way. For example, she could have been part of a secret ninja organization long before she met Minato. This organization could have had a major influence on the events of the ninja world that was never revealed in the original story. In this fanfiction, Kushina's actions and decisions within this organization could shape Naruto's destiny in ways we can't even imagine.
For Naruto, you could show his growth in terms of his leadership skills when he's with Naruko and Kushina. He could learn to be more patient and understanding, especially when Naruko might have a different approach to things. For Naruko, her character could be developed by showing her struggle to be recognized in a world where Naruto already has a reputation. Kushina could be developed by exploring her motherly side more deeply, as she interacts with both Naruto and Naruko.