Another theme is identity. The female Kyuubi may not know who she really is or where she comes from. She could be on a quest to discover her true nature. This can involve exploring her past, her relationship with other characters, and how she fits into the world around her. It can be a very self - discovery - heavy theme.
Power and control are often themes. The female Kyuubi has great power, and Naruto has his own power and his experience with the original Kyuubi. So, in fanfiction, there could be a struggle or a cooperation regarding who has control over what. Also, the theme of acceptance. Naruto has to accept this new form of the Kyuubi, and the Kyuubi might have to accept Naruto's way of doing things.
One common theme is friendship. Since Naruko and the Female Kyuubi are two different entities, their relationship often develops into a strong bond of friendship in many fanfictions.
Well, often there's the theme of acceptance. Naruto has to accept the female Kyuubi (if it's in a form where it's a character) and the other girls in the harem. And the girls also have to accept Naruto with all his flaws and his connection to the Kyuubi. There's also the theme of adventure. They go on adventures together, exploring new parts of the Naruto world, and in the process, their relationships deepen.
One common theme could be power struggle. Since Naruto is evil, he might be misusing the power of the Kyuubi in a more malevolent way compared to his normal self. Another theme could be redemption. Despite being evil at first, there could be a journey towards redemption through his interactions with the female Kyuubi. Also, there could be a theme of forbidden love. Their relationship in this fanfiction could be something that goes against the norms of the Naruto universe, adding an element of drama.
Power and its consequences is also a major theme. Having Kitsune and Kyuubi powers can be a double - edged sword. She can use them for great good, like protecting the village, but she also has to deal with the negative aspects. People might be afraid of her or try to use her powers for their own evil purposes. This is often explored in these fanfictions. In some stories, she has to learn to control her powers so that they don't consume her.
Another theme is relationships. There could be stories about the female Kyuubi forming unique bonds with the other characters in the Naruto world. Maybe she has a special friendship with Naruto or a different kind of romantic relationship with a character. This can lead to interesting character development and new storylines.
One common theme is power. How Naruto's connection to the Kyuubi gives him extraordinary abilities. Another is identity, as he has to figure out where he ends and the Kyuubi begins.
Another theme is identity discovery. The kyuubi may be in a new world or situation where it has to figure out who it is in relation to the new surroundings. It might have to re - evaluate its purpose and abilities. For instance, in a crossover with a high - tech world, it might wonder if its traditional powers are still relevant.
One common theme is the power struggle. It often shows Naruto trying to control the Kyuubi's power, which can be overwhelming at times. Another theme is friendship. Despite the initial hostility between Naruto and the Kyuubi, many fanfictions explore how they can become friends or at least allies.
A common theme is the relationship development between the sub female Kyuubi and Naruto. It often involves the exploration of their unique bond, perhaps starting from a place of misunderstanding and growing into something deeper.