I think this is a cool idea. I'm still pretty foreign to Advanced, but I can fit the post length. 
Anyway, I have a few questions:
	. As far as our characters go, did you have a specific age range in mind?
	. Would it be assumed that all characters are speaking the same language, even those from different worlds?
	. Would a physical disability, such as being deaf or in a wheelchair, count as a "severe illness"?
	. Is there a limit on how technologically advanced our character's homeworlds can be? 
	. Could a character from a past incarnation of Earth be alright? Dickensian London, Edo Period Japan, World War II America, etc?