Yo, here's your Metal Demon, Belzerax.
The bat reference:
(I mirrored this bat head)
For the other reference of the jacket and wings bones, I can't find them on the gallery for some reason.
Boi, does this one take a lot of time for me to looked for the references and putting them up together.
You didn't specify what kind of bat he is, so, Egyptian fruit bat, it is.
I decide not to color it since in your description, he's black everywhere. -_-
The goat feet does not shown, the jeans rips wasn't visible, the tongue is inside, the glasses is somewhere, the instruments pendant, you didn't specify, so its looks like some squiggly lines, and I completely forgotten about his scorpion tail (I missed reading this on your description).
For some reason, this looked more like a furry drawing more than anything. (Note, I'm not against furry or anything. I'm in the ground zero)
P.s. a tip, don't go googling satyr pictures if you're not mentally prepared. (You know about the mythology about satyr? That's why)