Firo, that was largely my reasoning for not allowing OCs in the first place though I could have communicated that better. 

It just so happens we have five people :P It's an inspired idea, somewhat like choosing characters for a video-game session xD If everyone agrees to this, I think it could work splendidly. If everyone controls more than one character, say two or three, we could also have a few different plots advancing at the same time. With all of the different stories connecting in plot development and character development, much like the actual show.