[Ah, so she did find the function for this. Here, have what sounds like a human male's voice, though he has an odd habit of extending his vowels, rolling the R sound and making his consonants sharp.]

Oh? I've heard of that, but I was given to believe it is something in fairy tales. I am a Greeed.

Others might call them 'monsters' or 'demons' so I suppose that those words would fit as well. As for what they look like, they can be anything.