There's no definite information on the main characters without further research on this specific 'Fools Gold' based on a true story. However, in similar tales, we often find characters like the dreamer, the skeptic, and the opportunist. The dreamer is the one who is lured by the idea of 'fool's gold' and chases it wholeheartedly. The skeptic might be the voice of reason, warning against the false pursuit. And the opportunist could be someone who tries to take advantage of the situation created by the search for this illusory treasure.
I'm not sure specifically who the main characters are without more information about this particular 'Fools Gold' based on a true story. It could be a group of miners, or perhaps some treasure hunters.