The Demogorgon from Stranger Things is a spooky little monster. The beast from Stranger Things is just human-adjacent to be creepy, and threatening because… well his head is teeth.
It was clear he was mostly built through CG, but it is now clear he wasn't entirely. Design studio Spectral Motion helped make a practical animatronic of the monster and it is really impressive. And by that, I mean terrifying. You can really get a good look at him here, and now I wish I hadn't.
Take a look: