[quote=@ERode]
Now [i]my[/i] question: do all PCs come from the same era? Are we all modern-day humans? Are we all humans from the same world?
[/quote]

I’d prefer if they were all modern day tbh. My idea is that both worlds run on a parallel timeline so there would have already been humans from the past that have crossed over. And yes, you would all be from the same Earth as it were.