I see a lot of DLC releases for 2D (pixel) monsters, but never 3D versions. There are few 3D monsters available, and animals, none that I've seen. Animals are also important for creating natural/wild environments in games, for placing on farms, etc.
I think these two are the things that are most missing in Bakin at the moment, characters (humans) can be created with Vroid, but monsters and animals cannot.