So regarding the whole suid things, imo both the wild boar and a domestic pig are essential, with strong arguments for the visayan warty pig and even a second domestic.
Wild boar we all know the deal, bla bla, wild park, bla bla, ungulate for europe that isnt a deer or mountain locked, blabla actually kinda world wide rep, bla bla largest and so far only cold weather pig, you have heard it all before
Regarding the domestics, both the kunekune and vitnamese pot bellied are super common, got interesting breed historys and are currently kept alive through zoos while also looking visually distinct from both each other and all other pigs in the game. Theyd also be super usefull petting zoo animals if we should ever have more then camels to fill them.
The visayan warty pig is neat, nowhere near essential but i wouldnt be mad about its inclusion. Critically endangerd, a recent super star that got adopted by many different zoos as they are desperatly trying to build up a good back up population aswell as spread awareness about these rapidly declining suids, looks unique, first animal from the phillipenes, really not a bad choice. They are very much below the boar and a domestic regarding being needed, but if frontier does a pack that could include it, id really do like to see it as one of their filler picks. Afterall the only filler better then pigs are birds and monkeys