Because you like Lily Aldrin in How I Met Your Mother

A compassionate medical student, Martha Jones has found a Doctor she can really look up to. See them in Doctor Who.

Merlin is half awkward teenager, half super-powerful wizard. He serves Prince Arthur of Camelot during the day and illegally learns magic at night. See them in Merlin.

Evan is a sensible kid, but being sensible isn't going to help him lose his virginity. See them in Superbad.

A Hollywood starlet with a vindictive streak, Madison Montgomery is one witch that you shouldn't cross. See them in American Horror Story.

Audrey Horne may seem inquisitive and charming, but she can turn on a dime. See them in Twin Peaks.

A bumbling hobbit, Bilbo Baggins is becoming a part of something much larger than himself as he embarks on a quest. See them in The Hobbit: An Unexpected Journey.

Reckless, vulgar, loud-mouthed: that's what makes Amethyst so awesome. See them in Steven Universe.

Manipulative, conniving, and ruthless, Mr. Gold is enigmatic no matter what world he's in. See them in Once Upon a Time.

The witty Aku would be an ideal dinner guest, if he weren't a demon. See them in Samurai Jack.

Tom Haverford is set on being a world-renowned entrepreneur who dates models. Problem is, he's stuck in Indiana with a lazy business partner. See them in Parks and Recreation.

Ofelia is face-to-face with the deadliest creatures of the underworld and completely unafraid. See them in Pan's Labryinth.

Taystee Jefferson is always down for a laugh and to help a friend out. See them in Orange Is The New Black.