Khanzumerz are just that: consumers. Whether or not they are a species or just the way Industrialists say "consumer" is another matter. I always thought it was nothing more than a joke by OWI. They said that consumers are the most important creatures on Oddworld (from the industrialist perspective) and then spelled it in that Oddworld style and made it sound as if they are a new species. Which may be exactly how the industrialists treat them.
Without the Khanzumerz, there would be no cause for the destructive of Oddworld's wilderness, which is why they're supposed to be the only evil creatures on Odworld, whether they mean it or not: almost every moment of their day is spent supporting the exploitation of Oddworld's resources by the most banal of decisions (such as the brand of shampoo brightener they choose to buy). This is a very accurate and poignant commentary on the real world.
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