GAH! waiting on inventory to buy a computer that can run this but based on the demo reels and intro play-through video I saw:

intellect devourer! Kill on sight! Although it did remind me of the Scrivener from Hordes of the Underdark (because they re-used their intellect devourer model). As the PC I probably would have thought the guy in the chair a sick experiment and looked for a way to put him out of his misery. As the human playing the game, after seeing it might help me navigate the intro I'll definitely do a play through with it. It was it's voice that made it creepy. Should sound more like a disembodied adult and less like some child trying to sucker you in to something your shouldn't do.