In the most recent
Some come to mind immediately:
Vigi the Loon
Essi Daven
Dagon
Falka
Golden Nekker
However, there might be other characters I haven't thought of yet as well. If you have a character you really want added to Gwent (not one of the above), comment below and explain why. Once I have enough responses, I'll put this to a vote.
Thanks for reading!
Source: https://www.reddit.com/r/gwent/comments/qb1fk0/now_that_burza_has_confirmed_renfri_will_be_added/