Because you like Alex DeLarge in A Clockwork Orange
Wheatley's got an endless supply of bad ideas that he wants to share. See them in Portal Series.
A fourth grader without a moral compass, Eric Cartman lives on KFC, Taco Bell, Pizza Hut, and Cheesy Poofs. See them in South Park.
After having his mind altered after a bad breakup, Joel Barish is not convinced that ignorance is bliss. See them in Eternal Sunshine of the Spotless Mind.
Daring on a bike but haunted in his personal life, even Johnny Blaze isn't fast enough to outride his past. See them in Ghost Rider.
Sookie Stackhouse is a waitress who can read minds and break hearts. See them in True Blood.
Anakin Skywalker is said to be the chosen one, who will destroy the evil Sith. But he struggles with Jedi ideals as he grows in power. See them in Star Wars Series.
Egon Spengler prefers collecting spores, molds, and fungus to interacting with people. See them in Ghostbusters.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.