Okay, you're on of the longer-standing guys on here, and I've been here almsot two years now, I think. So, the thing I want to say is that your approach to evil is one I find interesting.
There's a lot of flavors of bad guy. There's even a wide variety of effects evil can have on a person. So, different writers take on a different kind of approach to what makes the bad guy so damn bad.
Although I hardly have threaded with Voracitos, I've rad a lot of your stuff with him. In his position, evil isn't just consuming or massive--although those are both things--it's an active force of corruption and degradation. The big V's vaunted "hunger" is more liek a plague of locusts than than a simple massive greedy creature. He's a blight an a menace, but he's also as well described as a mass of menaces combined into one horrible, bloated messy, thing. In many ways, he's a great example of a villainous monster--he's just a man who's vices became so exaggerated he became a monstrous creature.
Your Hutt's a little more eccentric, and actually one of the more off-beat concepts I've sen in the Primeval. He's religious, but still impious. He doesn't look at the gods as spiritual models as much as physical ones. There's a divinely inspired hubris to Z that's even more audacious than your average Hutt--and that's saying something. If Voracitos is best described as the "monster," then the word I'd throw at Zambrano is the "deranged" or even the "Arrogant madman." Z is the kind of being who could be perfectly fine with the universe if his ambition wasn't so far beyond conventional sanity. He'll delve into some truly crazy things to find some truly wicked answers--and it will be a fun ride to watch him do so.
I've always like Villains, and I think you have a real knack for finding ways to make a villain memorable. We often talk of scale and power, but really good bad guys--the jerks you love to hate, the ones who make you curse at the screen and stare in shock--are the ones who make it personal, the ones who make it hurt, the ones who find ways to disturb you. While your bad guys are often very geared towards one or two specific ideas, and very single-track baddies, they do that effectively and intelligently, and that's a good thing. After all, the heroes look good when they are fighting truly vile opponents. So, keep throwing mosnters around.