Friendship is also a popular theme. It shows how two very different beings can come together and form a strong bond. They might start off as strangers or even enemies, but over time, they learn to trust and rely on each other.
One common theme is power. Since both Kushina and the Kyuubi have significant power, fanfictions often explore how they control and use it. For example, they might team up to fight a greater evil that threatens the village.
One common theme is family. Since Kushina is Naruto's mother, fanfictions often explore the family bonds. They might show how Naruto's connection to Kushina affects his relationship with the Kyuubi. Another theme is power. The Kyuubi's power within Naruto is a huge aspect. Fanfictions may deal with how Naruto learns to control it, and how Kushina's own experiences with the Kyuubi's power can help or hinder Naruto. Redemption can also be a theme. The Kyuubi, which was once seen as a monster, could be redeemed through its relationship with Naruto and the influence of Kushina's memory.
Common themes may include the power dynamics between Kyuubi and Kushina. Since Kyuubi is a powerful entity and Kushina was its host, fanfiction might play with this idea in various ways. In some lemon fanfiction, there could be themes of forbidden love or a complex relationship that goes beyond the normal host - tailed beast relationship. But again, due to the 'lemon' nature, these stories can be quite adult - oriented and not for everyone.
A frequent theme is the struggle between good and evil. Dark Naruto represents a darker side, and the Female Kyuubi can be seen as either a force for good or bad depending on how the story is written. Their relationship also often explores themes of trust and betrayal as they try to figure out if they can rely on each other.
Family and legacy are also common themes. These fanfictions could explore how Kushina's relationship with Naruto affects his understanding of the Sharingan if there are some unforeseen connections. It might also look at how the legacy of the Uzumaki and Uchiha clans are intertwined through Kushina and the Sharingan, perhaps showing how past events in the clans' histories are related to present - day situations in the story.
One common theme could be the exploration of their symbiotic relationship. Given that Kushina was the host of the Kyuubi, stories might delve into how they interacted on a mental or emotional level. Another theme might be the power dynamics, as the Kyuubi is an extremely powerful entity and Kushina had to control it. Also, stories may focus on their backstories and how their relationship might have been different if certain events in the Naruto universe hadn't occurred.
Often, in these fanfictions, Naruto has a hidden power that is related to his Uzumaki heritage. This power awakens when he realizes Kushina is in danger from the Kyuubi. He then uses this power to not only save Kushina but also to tame the Kyuubi in a way that no one has ever done before. It could also be that Naruto has made a deal with some other powerful entity that gives him the means to save Kushina from the Kyuubi.
A sense of discovery is also a common theme. Both characters might be discovering new aspects of themselves and their feelings for each other. It could involve the discovery of a new form of love that they hadn't experienced before. This theme can add an element of excitement and novelty to the fanfiction, as readers get to follow along with the characters' emotional and self - discovery journeys.
Some Kushina fem Kyuubi fanfictions might delve into her backstory more deeply. They could show how her life would have been different if she had always had this fem Kyuubi aspect. This might include her training, her relationships with family members like Minato, and how she influenced the future of the village from an earlier point in her life.
One common theme is family reunion. Given that Naruto never really knew his mother in the original story, fanfictions often explore the idea of them finally getting to be together and building a relationship. Another theme is the passing on of knowledge. Kushina was a powerful kunoichi, so she might teach Naruto things in the fanfictions.
One theme that frequently shows up is redemption. Kushina might be protecting Naruto to make up for not being able to be there for him when he was growing up. Also, the theme of hope is present. Her protection gives Naruto hope in difficult situations, making him believe that he is not alone and that he has someone looking out for him, no matter what.