I'm going to have to side with the lil bats, those seem like they'd be very interesting to have around! They could always do so much cute and fun designs but yet they always slack off.
+1 for bats and butterflies / moths, those sound amazing
it would also be cool to see more sea creature villagers, octopi are ideal and i love them but we have so little to choose from, i want a yellow octopus so bad
if they could find a way to do jellyfish somehow that would be adorable
also since we have cubs AND bears, why not puppies and kittens too?
Some I can think of off the top of my head: Bats, flamingos (is flora a flamingo?), llamas, alpacas, donkeys besides that one jock horse, toucans, meerkats, and warthogs.