Anyone who hasn't read the book, I highly recommend it! Best-quality fantasy I've seen written in many years ... and in a style that may even be good for introducing non-fantasy-nerd people (i.e., those who don't play D&D

) to the genre in a way that will get them to like it.
Problem is, the book doesn't really demonstrate the idea of an adventuring Seon at all. No Seons in the story fight, explore, or even get involved in politics independently of their masters. So the book doesn't really give me much idea of how to portray them in an RPG, especially as PCs.
My best advice is to hope that Sanderson eventually decides to write a sequel. (He's thinking about it, and has changed his mind back and forth several times on the issue.) If he writes a sequel, he has said that it will explore a lot more about the Seons -- discovering their origin will be a major subplot -- and that one of the main characters, perhaps even one of the "perspective characters," would be a Seon. (The other main characters would be Kiin's children, and the book would take place at least 10 years after Elantris.)