This fanfiction concept likely delves into the idea of how a character's birthplace on the Dark Continent influences their relationships with other characters in the HxH story. Being from such an exotic and feared location, they may face prejudice or curiosity from others. The story could also involve their attempts to either embrace their dark continent heritage or distance themselves from it, all while navigating the complex world of hunters and their various quests.
Well, Oc might face extreme and unique creatures there. The Dark Continent is full of unknown and dangerous things. Maybe Oc has to constantly fight for survival against these menacing beings while also trying to uncover the secrets of this mysterious land.
Another theme might be identity. The character born on the Dark Continent may struggle with their identity, especially if they interact with those from other parts of the HxH world. They have to figure out how their origin on the Dark Continent defines them or if they want to break free from the stereotypes associated with it. This could involve exploring their cultural roots, if there are any distinct cultures on the Dark Continent, and how that fits into the larger HxH universe.
I don't think so. There haven't been any official announcements or indications that the HxH manga will continue. But you never know, maybe there'll be a surprise in the future.