Well, as mentioned in the OW art book, the artists are inspired by real creatures, and incorperate their recognisable features with completly new ones, so you end up with a unique, imaginative and altogether odd creatures, whilst people still recognise main features of it.
Oh, and that goes with everything more or less, they don't pick concepts of out nowhere, they are inspired by real things, because an environment or creature or group with no resembolance to anytrhing will like quite odd (not in a good way) and more importantly, the auidance cannot relate to it.
Hense you see trees and cacti on alian worlds, if not oddified, and characters with stories similuar to the real world, if you like, the world of oddworld is a representation to our own.
Oh, and every oddworldian character can be compared to real creatures, so I'm not going to make a list, however, characters may be resembled to completly different real life creatures, due to their physical apperances and behaviours or their stories and circumstances.
And yes, I'm sorry, couldn't resit making another long a boring post :P Will try harder next time
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