Because you like Liesl von Trapp in The Sound of Music

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

Kenzo Tenma would have never guessed that ten-year-old he saved would later become a deadly serial killer intent on "thanking" him. See them in Monster (TV Show).

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.

There's nothing like discovering dear old dad is a serial killer to send you into an (understandable) funk. See them in Hannibal.

Lyra Belacqua is prone to getting in trouble, but she's also clever enough to get out of it. Most of the time. See them in The Golden Compass.

A bloodsucker, Carlisle Cullen is actually more likely to give you a blood infusion. See them in Twilight.

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.

Raj Koothrappali is an astrophysicist who sees stars when he feebly tries to chat up women. See them in The Big Bang Theory.

Stan Marsh is a fourth grader who is the ladies man of his classroom. See them in South Park.

R2-D2 has been in the galaxy saving business for decades. Not bad for somebody whose vocabulary is limited to "beep-boop." See them in Star Wars Series.