Because you like Kara "Starbuck" Thrace in Battlestar Galactica
A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.
Roger Kint is a nervous, weak, ham-handed criminal. We think. See them in The Usual Suspects.
Loyal to his family and associates and distrustful of anyone else, Tony Soprano is a good guy to have on your side. See them in The Sopranos.
Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .
Cosima Niehaus loves exploring the unknown. Even her own DNA is a puzzle, waiting to be unlocked. See them in Orphan Black.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
Keren Walker is a socialite looking to avoid work, keep a constant buzz, and be as snarky as possible. See them in Will & Grace.
A no-nonsense pro, Agent K has dedicated his whole life to his job. See them in Men in Black.
If this slick ad man doesn't like the conversation, he changes it—while drinking and smoking. See them in Mad Men.
For Dana Scully, sometimes looking for extreme possibilities makes you blind to the probable explanation right in front of you. See them in The X-Files.