Because you like Merry Brandybuck in The Lord of the Rings
John Watson is haunted by his past (who isn't) but he's starting to branch out with some help from a world class detective. See them in Sherlock.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
People make more sense to the hyper-logical Temperance Brennan after they're dead. See them in Bones.
Princess-turned-General Leia Organa is a sharp, fearless royal who gets herself into trouble and fights her way out of it. See them in Star Wars Series.
A former high school outcast, Rebecca Doppelmeyer is tentatively shaking off her misanthropic personality. See them in Ghost World.
A jealous woman is dangerous. A jealous assassin woman like Elle Driver is even more so. See them in Kill Bill vol. 1.
They say they saved Adam Jensen by turning him into a cyborg, but he's not sure saved is the right word. See them in Deus Ex Series.
Jack Bauer is a terrorist fighter who is scared of nothing and no one. The clock is ticking! See them in 24.
Fox Mulder is a devoted believer in aliens, monsters, and that the truth is out there. See them in The X-Files.
Just call Jeff Lebowski The Dude. Or His Dudeness, Duder, or El Duderino if you're not into that whole brevity thing. See them in The Big Lebowski.
What Ron Weasley lacks in motivation and book smarts, he makes up for in loyalty and street smarts. See them in Harry Potter Series.