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Well; what I've noticed, as the Oddworld game series has progressed...we've been introduced to a whole range of different looking characters with their own unique looks. In AO; a lot of the characters are quite menacing in terms of looks (Scrabs, Paramites etc.) but in AE, we are introduced to some slightly more wacky looking characters (most notably; Greeters) and in MO and SW; theres even mixture of both. I mean if you saw a Fuzzle and a Slig both on their own and had no idea what games they were from; you'd probably assume the Fuzzle is from a kid's game and the Slig is from an action/shooter style game, thats the wonderful thing about Oddworld...theres a huge variety of characters. 
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Whilst a lot of that is due to the different vibes of each game coming out through the designs, it also has to do with who were the production designers in OWI at the time.