Because you like Emmett Brown in Back to the Future

Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.

A good-natured and academically minded superhero, Dan Dreiberg can still get his hands dirty in a fight. See them in Watchmen.

A blood-thirsty warrior on the battlefield, Ragnar Lothbrok is a dedicated family-man at home. See them in Vikings.

Alex Dunphy's self-reliant intelligence comes with a healthy dash of sarcasm. See them in Modern Family.

Riggan Thomson is a washed-up movie star running from his inner demons. Alas those inner demons look just like the superhero he used to play. See them in Birdman.

Stella Grant is an organized, orderly optimist living with a dangerous disease. See them in Five Feet Apart.

Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.

Resourceful and courageous, Chun-Li is dedicated to using her considerable strengths against evil. See them in Street Fighter.

A jealous woman is dangerous. A jealous assassin woman like Elle Driver is even more so. See them in Kill Bill vol. 1.

Sue Sylvester has a win-at-all-costs philosophy, a bizarre fixation on a school singing club, and a fashion style that involves a red tracksuit. See them in Glee.

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