The stories are unique in that they offer a window into the individual psyche. Each person's 'darkness' is their own, and how they tell their story, the emotions they convey, and the lessons they've learned are all part of what makes them stand out. They may cover a wide range of themes, from internal battles like self - doubt to external struggles like discrimination. And the way these themes are explored through the specific experiences of different people is what gives the stories their distinctiveness.
The stories are unique because they likely come from different individuals with their own distinct voices and experiences. Each person's 'darkness' is shaped by their personal history, so the stories will vary widely.