One idea could be an alien OC who comes to Earth as an exchange student in a human school. This would lead to humorous and heartwarming situations as they try to fit in with human customs and make friends. They might have strange eating habits or unique ways of communicating that create misunderstandings at first.
A plot could involve the fem alien being in danger on Earth and the OC coming to her rescue. This could lead to a bond between them. Maybe the OC discovers that the fem alien has special powers that she needs to hide from the wrong people on Earth. They then have to work together to keep her safe and in the process, they fall in love.
Perhaps an alien OC from a water - based planet. Their physiology is adapted to living in water, but they have the ability to create water - based constructs. They come to Earth in search of a special type of gemstone that is said to have the power to heal their ailing home planet's oceans. This would create a plot full of adventure as they team up with the Crystal Gems to find the gemstone.
A cool concept could be an alternate universe where humans and aliens have been interbreeding for generations. The story could focus on a young character who is part - alien and part - human and their journey to discover their true identity and find their perfect alien mate among different alien races.
One idea could be a story where a group of scientists discover a new type of Xenomorph that has unique abilities, like the ability to camouflage not just visually but also thermally. Another could be a Xenomorph in a post - apocalyptic world where it has to adapt to a new environment filled with human - made obstacles.
One idea could be an alien exchange student in a human academic setting. The alien has to adapt to human teaching methods and social norms while also hiding their unique alien abilities. Another could be an academy on an alien planet where different species come to study advanced technologies and inter - species relations are explored.
One idea could be that the resurrected alien has some new powers. Maybe it can now blend into its surroundings like a chameleon, which adds a new level of danger. Another could be that the alien forms an alliance with a group of humans who are outcasts from society, and together they try to take over a powerful corporation.
Some fanfictions might explore how the alien bloodline affects the characters' relationships. For instance, a character with an alien bloodline might have a hard time fitting in with their peers at first. But as they grow and learn to control their powers, they could form strong bonds with other outcasts. Or they might be hunted by certain groups who see their alien bloodline as a threat to the existing power structure in the ninja world.
One idea could be that Amanda discovers a way to communicate with the Alien on a basic level. Maybe she uses her engineering skills to create a device that emits frequencies the Alien can understand. Another could be that Amanda and the Alien form an unlikely alliance against a common enemy, like a group of rogue Weyland - Yutani employees who have their own malicious plans for the Alien.
In Ben 10 Alien Force OC fanfiction, there are several engaging concepts. One is the concept of OCs having a hidden agenda. For instance, an OC might seem friendly at first but is actually working for an evil organization. This creates a sense of mystery and suspense. Another concept is the cultural differences between the OCs and the regular Ben 10 aliens. If an OC is from a highly advanced and peaceful society, their values and reactions to the chaos in the Ben 10 world can be very different, which can be explored in interesting ways in the fanfiction.
One idea could be creating an OC who has a unique power related to time manipulation. They could be from a different dimension and end up in the Avengers' world. Another idea is an OC who is a master of ancient magic and teams up with Doctor Strange within the Avengers group. Maybe an OC that is a super - intelligent android created by a villain but has a change of heart and joins the Avengers.