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 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.
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 interesting idea could be the unique bond between Naruto and Kurama evolving into a more spiritual or emotional'mate' - like connection. This might involve them sharing deeper thoughts and powers in a way that was not explored in the original series.
One idea could be the demon's mate having a special power that is the key to saving the demon realm from an ancient curse. Another could be the struggle of the mate to adapt to the demon's dark and dangerous world while still holding onto their own humanity. Maybe the demon's mate is from a different supernatural species, like an angel, and their relationship is a forbidden love that defies the rules of both their worlds.
An interesting OC mate could be a human with a special connection to the spiritual world. She can see the spirits that Inuyasha sometimes misses. Their story could involve her helping Inuyasha understand the deeper mysteries of the spiritual realm. They might meet when she is being chased by a minor demon and Inuyasha saves her. This event sets off a chain of adventures where they fall in love while uncovering secrets about the world they live in.
In Naruto Mate Mark fanfiction, one interesting idea could be the unique bond it creates between characters. For example, the Mate Mark might signify a special connection that goes beyond normal relationships, like a deeper level of trust and understanding. It could also be used to show a character's growth, as they come to terms with the significance of the mark.
Another aspect could be the family dynamic. If they are mates, they would likely start a family. How they raise their children to be strong yet kind ninjas, passing on the values of their respective clans, like Naruto's Uzumaki spirit and Naruko's (assuming a female version of Naruto) own unique traits.
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 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.