I'm going to go ahead and put a few entries in. My first is for Best Monster Voice Performance. It's in my Fishy playthrough uploaded here with time stamp to the scene with the Oculopus, the entry of course is for the voice of the Oculopus itself.
Disclaimer: though this was uploaded to Youtube after the fact, it was entirely performed and recorded live and has not been edited aside from edits to separate this game from the other games played that evening.