Even though I don't participate in the RPs here, I'd agree that it is a good way to develop both major and minor characters that you intend to use in your novel or short-stories. It gives you a chance to put them into situations and work out the details of their behaviors, fears, ideals ect.
It's one of the reasons that we have RP's here at FWF.
Well, that... plus they can be a lot of fun.
