Let's see
Racoon - common in European zoos, many color morphs, adorable and arboreal North American
Black Bear - I feel like a bear is needed for this pack theme. NA black bears are forest animals through and through, semi arboreal, and, again, lots of fun color morphs. Plus, I just like them.
ANY Ground Bird - Wild turkey would be my preference, but things are getting heavily biased to NA so I'll open this slot to any woodland ground bird or pheasants
Mandarin Duck - It nests in temperate lakeside forests, plus we need ducks.
Red Fox - Mr. Worldwide. More fun color morphs, versatile, and very in-demand. No other foxes will scratch this itch.
Eurasian Wild Boar - I'm not hugely fussed about this particular piggy (I would rather Red River Hogs and/or peccaries) but I have to admit they would be extremely versatile and I can't think of a zoo I've been to without them.
Pudu - I know that the red deer is a very wanted animal, and I know why, but this pack needs more continental diversity, so let's add a cite little mini deer from South America.
Animals I didn't add which might have seemed like obvious picks -
Spectacled Bear - it seemed more suited to an alpine pack
Kiwi and Tasmanian Devil - seemed more suited to an islands pack
Red Deer - Needed more diversity and I hope that we get this as a free gift at some point.
Porcupine - The most popular species on the wishlist is the crested and their more of dryland/scrub pack pick