I have mentioned this before but I want the rumored queen hero to be the khanzumer queen. I think it would make since. My idea is that somehow, Abe and the other four heroes will convince the khanzumer queen that what the Magog Cartel, Vykkers Conglomerate and any other industrial creatures are doing is wrong. The queen would then threaten to stop having babies and boycott glukkon goods until the corporate leaders change their ways. The quintology would end with a "peaceful" aliance of all species because if they aren't nice to each other, everyone will get screwed by the khanzumerz. After all, the khanzumerz are the most valuable creatures on oddworld.
As for the whole evil thing. Everyone is evil, everyone thinks they are doung what is right. It is really a very personal matter. In my opinion the Vykkers are truley evil because they enjoy causing pain for no reason, even though they themselves have low pain tolerance.