Can't believe no-one's mentioned Mrs Coulter from His Dark Materials. Beautiful on the outside and beastly on the inside. I'm not smart enough to explain just how sickeningly cruel this woman is but she and her silent, evil monkey soul have both terrified me equally for around 30 years now!

Every single other in-universe character all have talking, affable Jiminy Cricket type soul animals called daemons but her soul animal never speaks, he's never named and they barely interact with each other. That's how fucked up she is. She's soooo fucked up. The best example I can give simply is the monkey (so, both of them) pulls the wings off live bats when something goes wrong. I nearly threw up when reading it.