So, I'm not fully set up idea-wise, (in part why I'm putting it in interest to gauge ideas and what people would want.) The flat, general premise is that the king is dying. Before he does so he sends out a challenge to all of his heirs. A game. A game to be the first to reach a prize, and become the new king of the land. 
But on the day the challenge is to start, the three royals stand at the side of the kings bed, when a stranger walks in. And then another. And another. Until ships are docking by the port with heirs. The king has many children, far more than a mere three, and more than a dozen! All from different walks of life, and all rulers of their respective lives. One may be a merchant, but not a common one. No, he runs a vast market, making him fabulously wealthy. Another may be a knight, but a captain of the guard! Another a monk, who is respected by many for his wisdom. Another is a pirate king. Another a king of bandits. Another a king of the homeless and runs an operation through them. 

Basically, a story of trickery, character drama, and 'possibly' vengeance. 

Since it's the base of an idea, I'm open to ideas, or even what kind of stuff people would like to see. The setting would be kind of generic fantasy, with plenty of strange creatures and magic. 

Any questions?