Haladroth's voice is deep, rumbling, and kind of like a gator where standing close to him lets you /feel/ his voice. Surprisingly, for a guy without lips, he can enunciate very well with his mutated vocal cords. The voiceclaim I've got for him is Gravemind from the Halo series.

Villosk's voice is low and raspy, and he always sounds like he's up to something (because he is). Surprise, surprise, I've got Steve Blum's Starscream from TF:Prime as Villosk's voiceclaim. I just couldn't resist.