On villains and complex characters

JK Rowling hated a woman who used twee little bows in her hair, and she used that character trait in one of her villains. This got me thinking about what villainous traits I know in real life and how I can borrow from them to create complex and interesting villains on the page. This is a brain dump for me to refer back to later.

Villains in text

In comic books villains can be the opposite of the protagonist, brought to light in the movie Unbreakable, against the villain Mr Glass. Their...