One of the top stories could be Drake's initial discovery of the hidden treasures. He overcomes various challenges like dangerous terrains and rival treasure hunters.
The antagonists in the story are crucial as well. They constantly try to thwart Drake's efforts, creating a lot of tension and action. Whether it's a rival treasure seeker or a group with their own motives related to the fortune, their presence makes Drake's journey more difficult and the top stories more exciting.
I think Uncharted Story is good. The way it unfolds keeps you hooked, and the settings and action scenes are well-done. But, of course, it's subjective - different people have different standards for what makes a story good.
First, think about their backstory. For example, if they're an adventurer, what led them to this life? Maybe they grew up in a family of treasure hunters. Second, give them unique skills or flaws. A skill could be expert marksmanship, and a flaw could be a fear of heights. This makes them more human. Finally, tie them into the existing Uncharted world. Maybe they have a past with one of the existing characters.
Perhaps an OC is a young archaeology student who idolizes Nathan Drake. They manage to get involved in one of his expeditions through sheer determination. Along the way, they learn from Drake and also teach him new things about modern archaeological research methods. It could be a story of growth and adventure for both characters.