Generic Peasant characters!
NPC characters with plain clothing so they fit anywhere from a medieval village to a modern developing-country farm field.
Higher priority to peasant women (because there are currently few woman character options in the marketplace other than “sexy” types)
Higher priority to older peasants (because most human options in the marketplace are young paragons of humanity)
It would take only a material swap and a few props for an older peasant woman character to be used as a witch, a field worker, a wise woman, a seller in a market, a healer, a beggar, an ancient city inhabitant, etc. Generic-older-peasant-woman would be a really useful asset.