Oh!  Right.  Since a character's believability and their suitability for the setting and so forth are dependent upon the setting itself, are we submitting characters before or after the reveal of the setting?

When you say we must use our own characters, ones we created, I wish to make sure I understand the intent here.  I have characters I've created that other people played and then returned to me.  I have ones that I didn't technically conceptualize, but which I turned from concept to character, and which are entirely mine.  I have characters that I was given permission to adopt for use from others, and ones I was given and then reworked a great deal (these I'm guessing are out).  I also have characters that are entirely mine but were designed for use in a fandom, or in a world that was not entirely original.  Which of these are and are not permitted.

Additionally, given that we have 48 hours to reply, and that at times one person may be dependent upon another person's post before they may post themselves, and that will cut down the time from the full 48 to potentially far less, how do you plan to handle this so as to be fair to all participants?  I have no problem with the 48 hour limit, but I do wish to have a full 48 or at least very close to post, and not merely a couple (and I've had this happen to me in other places for assorted reasons).