Well, in some of these fanfictions, a common plotline is that the fem Kyuubi's possessiveness causes problems within the Hidden Leaf Village. Since Naruto is an important figure there, her over - protectiveness and possessiveness can be seen as a threat by some villagers or shinobi. This could lead to a lot of political intrigue and conflict within the village. Another plotline could be that the fem Kyuubi uses her power to isolate Naruto from the outside world, creating a sort of bubble around him where only she has access. But Naruto starts to feel suffocated and tries to break free, which then sets up a whole new arc of the story where he has to fight against her possessiveness while also not wanting to completely lose her. There could also be a plotline where other tailed beasts notice the fem Kyuubi's possessive behavior towards Naruto and try to intervene, either to help Naruto or to stop the fem Kyuubi from causing more chaos.
One common plotline could be the conflict that arises between fem Kyuubi's possessiveness and Naruto's own desires for freedom and friendship. Naruto might want to explore and interact with others, but the fem Kyuubi tries to hold him back.
One common plotline could be Kakashi constantly protecting the female Naruto from various threats. He might be overprotective in battles, not allowing her to take too much risk. For example, when facing a powerful enemy, he would step in immediately to shield her.
One possible reason could be that in the Naruto universe, Naruto has a special connection with the Kyuubi. As a female Kyuubi in fanfiction, she might feel a stronger emotional bond towards Naruto. She may see Naruto as her sole companion or the one who truly understands her, which leads to her possessiveness.
In this type of fanfiction, the fem Kyuubi's possessiveness might be manifested in her protecting Naruto at all costs. She could be overly vigilant and not allow any harm to come near him. This could lead to her interfering in battles or situations where Naruto might be in danger, even if he doesn't necessarily need her help all the time. She may also try to monopolize his time, not wanting him to go on missions with other people or make new friends. Her possessiveness could also be expressed in a more emotional way, like getting sulky or angry when Naruto doesn't pay enough attention to her.
One common plotline is the Kyuubi teaching Naruto new and powerful jutsu. Since the Kyuubi has a vast amount of chakra and knowledge, it could share unique techniques with Naruto that are not part of the regular ninja training. Another plotline could be the Kyuubi's influence on Naruto's relationships. For example, some fanfictions explore how Naruto's connection with the Kyuubi affects how his friends and villagers perceive him. It can also lead to some interesting character development as Naruto has to learn to control the Kyuubi's power without being consumed by it.
One possible plotline could be that fem Naruto has to learn to control the Kyuubi's power in a different way than in the original series. Since she's female, her approach might be more empathetic, and the story could focus on how she forms a deeper connection with the Kyuubi because of this.
One common plotline could be Kurenai trying to keep Naruto away from certain dangerous missions. She might think he's not ready yet and be overly protective in the fanfiction.
One possible plotline could be the yandere fem Kyuubi constantly trying to protect Naruto in overly possessive ways. For example, she might scare off any potential rivals for Naruto's attention, even his friends at times. Another could be Naruto initially being oblivious to her yandere tendencies and just seeing her as a strange but powerful ally. As the story progresses, he has to deal with the consequences of her extreme behavior.
One interesting plotline could be the exploration of their relationship in the face of Naruto's journey to become Hokage. The fem Kyuubi might support Naruto in his training and political challenges, adding a unique dynamic to the story.
Perhaps the story could revolve around the Fem Kyuubi teaching Naruto more about his Kitsune heritage. This could include special jutsu or abilities that only those with Kitsune blood can learn. The plot might also involve Naruto having to protect the Fem Kyuubi from other ninja who fear her power and want to seal her away again.
Another theme is power and control. In these fanfictions, the fem Kyuubi may have different levels of power and the story might revolve around how Naruto and she manage or share that power. For example, they could be working together to master new jutsu that involve the Kyuubi's chakra in a more positive way. Also, the idea of acceptance is a theme. Naruto has to accept this new version of the Kyuubi and vice versa, which can lead to some really interesting character development arcs.