One idea could be a crossover where Naruto characters encounter Xenomorphs in a hidden part of their world. For example, the Xenomorphs could be brought to the Naruto universe through a mysterious jutsu gone wrong. Naruto and his friends would then have to use their ninja skills to fight these deadly creatures. Maybe Sasuke could use his Sharingan to predict the Xenomorphs' movements.
Maybe the Xenomorph Queen herself could be the main antagonist. She is intelligent and powerful. She sees Naruto's world as a new place to colonize and sends her Xenomorph minions to attack. Naruto has to find a way to stop her before she spreads too many eggs and creates an unstoppable army.
One possible plot could be that Naruto discovers a hidden Xenomorph lair in the Hidden Leaf Village. He uses his ninja skills to try and figure out how the Xenomorphs got there and what their purpose is. Maybe he has to team up with some of his friends, like Sasuke, to fight off the Xenomorphs before they take over the village.
The unique elements often include the combination of Naruto's ninja abilities like jutsu and chakra control with the terrifying nature of Xenomorphs. For example, Naruto might use his Rasengan against a Xenomorph, which is a very cool visual.
In Amanda Ripley and Xenomorph fanfiction, often she is portrayed as a strong and resourceful character. She might be shown using her wits to survive encounters with the Xenomorphs. For example, she could use her knowledge of the ship's layout to outmaneuver the creatures, just like in the Alien franchise where her family has had to deal with these deadly beings.
Amanda Ripley can be a catalyst for change in the fanfiction. Her actions can lead to different outcomes for the other characters. If she decides to take a risky move against the Xenomorphs, like blowing up a part of the ship they are on, it can either save everyone or put them in more danger. And this makes for an exciting read as readers wonder what she will do next.
In the realm of fanfiction, anything can be made possible. However, considering the nature of xenomorphs (being extremely dangerous and alien in the most literal sense), a romantic relationship between a xenomorph and a human is highly unlikely in a traditional sense. But fanfiction often bends and breaks the rules of the original lore. Writers might explore this concept by perhaps giving the xenomorph more human - like emotions or creating a unique bond between the two species through some extraordinary circumstances.
When writing a xenomorph pregnant fanfiction, think about the setting. Is it on a spaceship? A desolate planet? The setting can add to the atmosphere. You also need to consider the emotions of the pregnant character. They'll likely be filled with horror, confusion, and a sense of impending doom. Try to show these emotions through their actions and thoughts. For the plot, you could have the character team up with others who are also in danger from the xenomorphs, or they could be alone and have to face it all by themselves.
A Xenomorph might be friendly if it formed a symbiotic relationship. For example, if it realized that by working with other species, it could get more food or better living conditions. Say there was a planet where the Xenomorphs and another species both needed a certain resource. Through cooperation, they could both thrive, and the Xenomorphs could become friendly towards the other species over time.
It could start with fear and curiosity. The human is initially terrified of the xenomorph but as they observe it, they notice some unique behaviors. This piques their curiosity and they start to approach it cautiously.