Dark creatures, monsters, supernatural or paranormals in movies/tv?

So, I'm watching the BBCA series '"Merlin". Haven't seen it in a while, but decided to do a Netflix marathon. I've watched almost all the episodes before, so now on my second watch after a year, now I am looking at the supernatural and paranormal creatures featured in the episodes so it got me thinking about the most fascinating or interesting versions of these beings we've seen in film. Which ones are your favorite?

I like ones that are not just violent but have some reason for being behind their existence, and have a soul so to speak. Even if they are evil, there is purpose and intelligence behind their existence.

For example, in season 1 of Merlin, they have a Griffin, Wraith (Tristan), and Dark fae from Avalon. Each of these beings were interesting to watch because they were insidious. I like the TV version of supernatural creatures better mostly because they don't rely as heavenly on special effects. The actors have to really bring these characters to life with their facial expressions, wardrobe and makeup, and not easily hide behind movie magic.

But one of the coolest dark creatures of all are the Weeping Angels from Doctor Who episode "Blink".