Because you like Alex P. Keaton in Family Ties

Topanga Lawrence has been a put-together intellectual since basically the moment she could talk. See them in Boy Meets World.

After years of being a nerdy loner, Seth Cohen can't wait to shower charm on his newfound friends. See them in The O.C..

In charge of stocking the office's supply of cigarettes and liquor, Joan Holloway could run the whole company if they would let her. See them in Mad Men.

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

A suave proprietor of an upscale nightclub and gambling den, Rick Blaine is dealing with World War II and a broken heart. See them in Casablanca.

Formerly a "sweater-set-wearing, mojito-drinking sorority girl", Paige Collins is now a successful sculptor with slight memory loss. See them in The Vow.

Catherine Linton was once spontaneous and rowdy but ever since marrying the wealthy Edgar, she has morphed into a boiling pot of emotional outbursts. See them in Wuthering Heights.

Good-natured, sensitive, and introspective, Mason is on a lifelong path to finding himself. See them in Boyhood.

Driven yet empathetic, Emily Prentiss brings humanity to the pursuit of inhuman killers. See them in Criminal Minds.

Dallas Winston is headed down a dangerous, criminal road. See them in The Outsiders.

Polite and clever, Annie James is not afraid to stir up a little mischief. See them in The Parent Trap.