A popular one could be Amaterasu, the sun goddess from Japanese mythology. Since Naruto's world has some roots in Japanese culture, it makes sense for her to be included. She might bring her divine powers to Naruto's world and interact with Naruto in unique ways.
One interesting plot could be Naruto being chosen by a fem goddess to be a champion in a divine tournament. He then has to fight against otherworldly opponents using his ninja skills and the new powers bestowed upon him by the goddess.
One great fem Naruto x fem Kyuubi fanfiction could be one that focuses on their unique bond. It might explore how they interact in a world where Naruto is female and the Kyuubi also takes a female form. For example, it could show them teaming up against common enemies and how their combined powers are different from the original story.
It could be original goddesses created by the author of the fanfiction. They might be based on different elements or aspects of the Naruto universe, like a goddess of chakra, a goddess of the forest where Naruto trains, etc.
One great Naruto x fem vampire fanfiction is 'The Vampire in Konoha'. It has an interesting plot where the female vampire character has unique powers and her relationship with Naruto develops in a really engaging way. They face many challenges together, both from the shinobi world and the vampire lore within the story.
In a Naruto x fem wolf goddess x fem kyuubi fanfiction, the fem wolf goddess could represent a more spiritual or wild aspect. She might introduce Naruto to a different side of the ninja world, one that is more in tune with the natural order. The fem kyuubi, on the other hand, could have a more fiery and powerful personality. The story could revolve around Naruto trying to balance the influence of both characters while also dealing with his own growth as a ninja.
One possible plot could be that the female werewolf is an outcast in her own world. Naruto, with his kind heart, befriends her. Meanwhile, the fem Kyuubi has a connection to Naruto due to the Kyuubi within him. They all come together when a common enemy threatens the Hidden Leaf. The werewolf could use her unique abilities, like enhanced strength and speed, to help Naruto in battles, while the fem Kyuubi might offer her own brand of power, perhaps related to chakra manipulation. As they fight side by side, a deep bond forms between Naruto and the two female characters.
A prevalent theme is also acceptance. Naruto has to accept these two unique entities into his life, and they in turn have to accept him and each other. It's about how different beings from different backgrounds can come together. And there's often the theme of adventure as they go on various quests or face threats in the Naruto world.
The plot should be engaging. It could involve a new threat to the ninja world that only fem Naruto and fem Kyuubi can stop together. This could lead to a lot of action - packed scenes and also some really touching moments between them as they rely on each other. A good fanfiction might also explore their backstories in this new context, like how fem Naruto came to terms with having the Kyuubi inside her as a female.
Another element is the reaction of other characters to this unique pairing. How do Sasuke, Sakura, and others in the Naruto world view the relationship between Naruto and Fem - Naruto? It often adds an interesting layer of complexity to the story, as their reactions can range from confusion to acceptance.