I would love to see some large viverrids DLC in the game. It is largely underestimated group. There are some iconic species that would look amazing in the game, like:
I would love to see all three of those animals (technically the fossa isn't a viverrid, but that's beside the point). Probably the other viverrid that sits near the top of the want pile for me is the Owston's civet - an endangered species whose survival is increasingly reliant on a captive breeding programme that is being run by several British zoos. Small carnivores (and smaller mammals in general) are something I really hope starts to appear more in Planet Zoo.