I think I may have something interesting for you!
My friend is a PsiStalker in our rifts game. Although psistalkers are humanoid, hers is pretty special. She has purplish-tinted pale skin and sharpened teeth. I know you said you are sick of thin things, but how about skeletal? The character is so thin that she literally looks like skin stretched over a skeleton. She has sharpened her teeth to better devour humans. She never needs to eat (she does it out of enjoyment), instead feeding on psychic energy to live. She is hairless and has a number of facial tattoos. Her character has a HIGH horror factor and is supposed to be grotesque. Her alignment is evil and she speaks in mostly grunts. This is her attempt at sketching the character(yes, she named it Marissa Tomei) to give you a sort of idea. Here are some more classic looking psi-stalkers
She was aiming to make her character incredibly hideous and grotesque but, as you can see, her drawing style does not quite do it justice... If you are into making grotesque things I would love to see how creepy you can make her character