The new Pokémon are arguably the most varied generation yet, almost 160 new beasties as opposed to what we're used to (100-130 or so)
The amount of new Ghost Types this gen has almost doubled what we had before too (so many amazing Ghost Types omg <3) and there aren't nearly as many Water Types, so the variation is huge, not just taking inspiration from animals, but also mythological symbols (for example my new favourite Pokémon is based entirely on ancient "Nazca Lines", and of course the coffin Pokémon).
I personally think that despite some really stupid ones GenV is my favourite Gen for designs thus far.