Love against all odds is also quite prevalent. Given the differences between asari and humans, the idea of them falling in love and overcoming various obstacles, whether it be political, biological, or social, is a popular theme. It can make for some very emotional and engaging stories. For example, they might have to deal with the disapproval of their respective families or communities. And in some stories, they have to find ways to bridge the gap in their life expectancies, as asari have much longer lifespans than humans.
A common theme is the cultural clash between the asari and human cultures. Since they are from different species, their ways of thinking, social norms, and values can be very different, and this often creates interesting conflicts and resolutions in the stories.
Another theme is the exploration of unique abilities. Asari have their own special abilities like biotics and a different form of communication. Fanfictions often explore how these abilities interact with the human characters. It could be that a human character is in awe of an asari's biotic powers, or they might find a way to combine their skills for a greater purpose, like saving a planet or a group of people from a dangerous threat.
One common theme is the exploration of an inter - species relationship. Since Shepard is human (usually) and the Asari is, well, an Asari, there are a lot of cultural and biological differences to be explored. For example, the Asari's long lifespan compared to Shepard's can create interesting dynamics in the relationship.
One common theme is identity. When a human turns into an asari, they have to figure out who they are now. Another theme is adaptation. They need to adapt to the asari's physical abilities, like their biotic powers. And there's also the theme of acceptance, both self - acceptance and acceptance by the asari society.
Cultural exchange is also a frequent theme. The oc, coming from a different background, has to understand and adapt to the Asari culture. This can lead to some really interesting situations. For example, in some fanfictions, the oc has to learn about the Asari's matriarchal society and their unique way of communication. And of course, there's the theme of self - discovery. The oc may learn more about themselves through their interactions with the Asari.
One common theme is cultural differences. Humans and asari have distinct cultures, and in fanfiction, these often lead to misunderstandings or clashes. For example, their views on family, honor, and social hierarchy can be very different.
One common theme is cultural exchange. Since humans and asari are different species, there's often a focus on how the human and asari child learn from each other's cultures. For example, the asari might teach the human about their biotic abilities, while the human shares things like their sense of family structure.
Well, I've heard that some fanfiction forums dedicated to the Mass Effect universe often feature oc asari x human fanfiction. You could try joining those forums and asking the members for their favorite stories in this category. They might be able to point you to some hidden gems that haven't gained wide popularity yet.
Survival is a very common theme. Since Predators are usually seen as dangerous hunters, the human OCs often have to fight for their lives. Another theme is the unexpected alliance. Sometimes, for various reasons, the human OC and the Predator end up working together.
A frequent theme is the biological implications. Since Asari have a unique form of reproduction and Humans are different in that regard, the fanfictions often explore how the two species' biology combines or clashes during the merger. This can range from simple physical changes to more complex genetic - level interactions. It adds a scientific - fictiony aspect to the stories and makes for some really interesting reads.
One common theme is self - discovery. Since the character is reincarnated, they often have to figure out who they are in this new life as an asari. Another theme is the struggle with memories from the past life. It can be confusing and sometimes even a hindrance to their new existence.
Love and romance are quite common themes. The story might revolve around how Nuada and the female human OC overcome the differences between their species to fall in love.