Because you like Gaius Baltar in Battlestar Galactica
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.
Petyr Baelish's main assets? A sharp mind, deep pockets, and no scruples. See them in Game of Thrones.
Alex Vause's tattoos and tough exterior cover the fact that she's just a girl with a really intense crush. See them in Orange Is The New Black.
Kim Kelly is a high school bully who's normally in a bad mood. But there's a softer side to her. See them in Freaks and Geeks.
Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.
A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.
Carol Peletier's credo: your strength comes from who you are, not who you used to be. See them in The Walking Dead.
Nicholas Angel is super-dedicated to his job as a police officer. Maybe a little too dedicated. See them in Hot Fuzz.
Don't tell anyone Kate Austen was under arrest when the plane crashed. See them in Lost.
Davos Seaworth is steadfast, intelligent, and trustworthy, which are hard traits to find in a place like Westeros. See them in Game of Thrones.