Because you like Cosima Niehaus in Orphan Black
Django was once a slave. Now that he has a taste of freedom, he understandably wants a full meal. See them in Django Unchained.
A secret smoker, Margot Tenenbaum has plenty more secrets where that came from. See them in The Royal Tenenbaums.
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.
Miss Havisham is the creepiest old rich lady in town. See them in Great Expectations.
Running away from murderous aliens has turned into an interstellar chase for Jupiter Jones. See them in Jupiter Ascending.
Taystee Jefferson is always down for a laugh and to help a friend out. See them in Orange Is The New Black.
A brave "Young Wolf," Robb Stark has never lost a battle. See them in Game of Thrones.
John Watson is haunted by his past (who isn't) but he's starting to branch out with some help from a world class detective. See them in Sherlock.
Artemis Fowl understands the way of the world. If he wins, he's a prodigy. If he loses, then he's crazy. That is how history is written. See them in Artemis Fowl.
A tough tomboy with a protective streak, Maximum Ride is a human-bird hybrid. See them in Maximum Ride.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
We're all puppets. Dr. Manhattan is just a puppet who can see the strings. See them in Watchmen.