So having listened to all the videos from yesterday and looking through the background art, I’ve figured out 15 of the 16 backgrounds:
Acolyte
Artisan
Charlatan
Criminal
Entertainer
Farmer
Guard
Guide
Hermit
Merchant
Noble
Sage
Sailor
Solider
Wayfarer
Whatever background is missing has to be AFTER Sage in alphabetic order. We saw one page of backgrounds and it shows 4 backgrounds, and those backgrounds are Hermit, Merchant, Noble, and Sage.
Sailor, Solider, and Wayfarer are the only three backgrounds after Sage, so there has to be one more here to match the four backgrounds per page.
You can also see what the art is in the Origins video around 8:50. It’s a large room with a black rock that has glowing writing on it and a bunch of desks. So my guess is the missing background is “Teacher” or “Student.”