Because you like Ellie Sattler in Jurassic Park
Catherine Linton was once spontaneous and rowdy but ever since marrying the wealthy Edgar, she has morphed into a boiling pot of emotional outbursts. See them in Wuthering Heights.
Sam Weir lives for the simple things in life: watching Saturday Night Live and reading comic books. See them in Freaks and Geeks.
Peter Venkman's "research" projects are designed to get undergraduate students to sleep with him. Though it turns out he can bust ghosts. See them in Ghostbusters.
Dr. Gordon Freeman is a brilliant physicist is a quiet hero. And given all the violent aliens, he better be. See them in Half-Life.
Wei Shen is an undercover cop on a mission for justice (or at least vengeance). See them in Sleeping Dogs.
Dante Alighieri is a crusader fighting his way to absolution. See them in Dante's Inferno.
M. Bison is a diabolical megalomaniac hell-bent on dominating the world. See them in Street Fighter.
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.
This cannibalistic villain may be a loner, but Killer Croc doesn't have problems with self-confidence. See them in Suicide Squad.
Aslan represents everything good and just, he's just not super reliable. See them in The Chronicles of Narnia.
