Perhaps there could be different portals to different starts, instead of having everybody come through the portal? Like, A: Murdertown, B: Mistlocke, or C: er, maybe the wilds? I dont know, but I think it could be more flavorful to the characters than all of them being teleported. I could think of a few or more Concepts with more options.
A bit later this may be a possibility. Right now, it's a bit too early for someone to know much about life in any of the places or the story there.
Ah! Okay, thanks!