One idea could be a group of humans caught in the middle of an unexpected alliance between a lone Alien and a young Predator. They have to figure out how to survive while these two usually hostile species work together for some mysterious reason.
One interesting plot twist could be that Naruto has some hidden alien or predator bloodline. Maybe his chakra is actually a form of alien energy that he unknowingly possesses. This could change the way he is perceived in the Naruto world and also attract the attention of both the aliens and predators.
A cool plot could be that a group of young ninja trainees are on a survival exercise in a remote area when they stumble upon an Alien - Predator battle. The Predators are outnumbered by the Aliens. The ninja trainees want to help the Predators because they seem more 'human - like' in their fighting style. Naruto, who is now a respected ninja, arrives to guide the trainees. He helps the Predators set up traps using ninja wire and explosive tags. In the process, they all learn about each other's cultures and fighting styles, and together they defeat the Alien threat.
One idea could be a young human who gets caught in the middle of an alien - predator conflict and has to use their wits to survive. Maybe they form an unexpected alliance with a lone predator who sees potential in the human. Another plot could be an alien - predator hybrid created by some mad scientist, and the two species have to team up to stop this new threat that is stronger and more unpredictable than either of them.
One interesting plot could be an alien and a predator having to team up against a common enemy and during the process, they develop feelings for each other. Their different cultures and ways of life would create a lot of tension and also moments of understanding.
A plot could involve a group of humans who are caught in the middle of a war between Predators and Aliens. They form an alliance with a rogue Predator who has his own reasons for wanting to stop the fighting. Maybe there's a powerful Alien queen that the Predators are desperate to kill, and the humans get dragged into that mission.
Well, in the 'alien vs predator graphic novel', the plot often centers around the age - old conflict between the aliens and the predators. The aliens are these terrifying, fast - breeding creatures with acidic blood, while the predators are highly advanced hunters. They meet in different settings within the story, like on a desolate planet or an abandoned spaceship. And of course, the battles are intense, full of blood and gore, with each side using their unique skills to try and defeat the other. Sometimes, there are also sub - plots about the discovery of new alien or predator technologies or behaviors.
A prevalent theme is the exploration of the female predator's character. Writers might delve into her backstory, her motives, and how she interacts with the other species in the 'alien vs predator' universe. There's also the theme of alliances. Sometimes she forms unexpected partnerships, either with humans or other predators, to achieve a common goal.
There's also the 'Ripley' character from the Alien series. Since she has so much experience dealing with Aliens, she can be a really interesting addition to a crossover fanfiction. She could potentially team up with a Predator to take on the Alien threat in a new and different way.
It could involve a Predator arriving on the planet in 'A New Hope' and getting caught up in the Galactic Civil War while also hunting Aliens that have somehow infested the area.
I'm not sure about specific 'alien vs predator female predator fanfiction' works. But you can try looking on fanfiction websites like Archive of Our Own. They usually have a wide variety of fan - created stories in this genre.