well, for house of the dead, to me it sounds like a zombie/mutant/apocolipse theme. for that, zombie wise i would jsut stick with growling, grunting, snarling, and deep throated moans. for "phobias", this sounds more of a mess with your mind style. i would be realy screwed up in talking, as possibly speaking backwards, or talking to yourself. try lines like:
"theres nothing to fear, except whats ahead of you!"
"SCREAM FOR ME! I want to hear you before you die"
"this will never end. your hell is about to begin"
meh, off the top of my head. not the best ones, but you get the idea.