Because you like Lucy Ricardo in I Love Lucy
John Yossarian is trapped in irony as he must be insane to leave the war but if he does try to leave, he'll be deemed sane and will be forced to stay, See them in Catch-22.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
Prim and proper Allie Hamilton was raised to follow the rules. But she's got a fiery rebellious side too. See them in The Notebook.
Though the weight of a secret robs her of her voice, Melinda is nevertheless artistic, intelligent, and empathetic. See them in Speak .
Hans Landa doesn't seem to have issues with Jews, but he hunts them because he's determined to do his job well. See them in Inglourious Basterds.
Liesel Meminger is trying to ease the suffering of those around her, German and Jew alike. See them in The Book Thief.
Bobby Singer is a redneck ghost hunter, but all he wants to do is retire to the junk yards of South Dakota. See them in Supernatural.
Wanderer is a Soul, a parasite sent into a host to take over their body, extracting information from them and colonizing their species. See them in The Host.
Maurice Moss is a dedicated IT guy who even talks like a computer. See them in The IT Crowd.
Innately shy, Ginny Weasley is growing into a feisty, independent spirit. See them in Harry Potter Series.
Nicholas Angel is super-dedicated to his job as a police officer. Maybe a little too dedicated. See them in Hot Fuzz.