I've been waiting for someone to claim Luke or Leia and then go with whoever is left. So if we have a firm Luke now, I'll take on Leia, I suppose. By which I mean the male Prince.
I'm also willing to write for some of the supporting cast that may not find fulltime players, like C-3PO (possibly with a more human-like less rigid form) or even Grand Moff Tarkin (sadly less Peter Cushing-y) if we have one. Gender reversed versions of course. I'll wait on that to see who gets taken and who doesn't though.
My one concern as the Prince is that my character is going to end up stuck in a cell on the Death Star for quite awhile before anyone shows up, which could get boring. So having a few other minor characters to write in the meantime may help. Actually it might work best for some people to take on multiple roles because some characters (the Empress for example) aren't always going to have a lot to do or many PCs they can interact with it seems to me.