ChasingSuns
Sage
For myself, fear of the unknown is really intense. It's something that I've always loved about Lovecraft's work. Also, villains who are cold and mysterious can be quite frightening. To me, Baelish in Game of Thrones is one of the most frightening individuals, simply because he is so good at hiding his plans and is so cold/ruthless, he becomes unpredictable. And he is willing to do whatever it takes to achieve his goals.