@ArchimedProduction: To be honest: why should anyone buy the animals when he she can have a whole bundle of them on the reallusion - content store for less than 85 bucks ?
It is avaible here: https://www.reallusion.com/contentstore/promo/2010AnimalWorld/
Am usually very careful of accusing folks, but your animals (all types are also included in the bundle) look pretty much alike the ones provided there (didn't have a closer look since I have better things to do).
For the characters: every child can buy "Character Creator" with "Headshop plugin" and other plugins made by Reallusion and kitbash with the morphs and features and create characters on mass pretty easy.
Sorry, but that has not much to do with creating (especially modelling what cgtrader should be all about) something all on your own.