Because you like Wendy Darling in Peter Pan
Veronica Lodge is a sophisticated girl who always, no matter what, absolutely gets what she wants. See them in Archie Comics.
Lyra Belacqua is prone to getting in trouble, but she's also clever enough to get out of it. Most of the time. See them in The Golden Compass.
CIA operative Carrie Mathison is on a self-assigned mission to follow a lead, whether it be the truth or just her delusions playing tricks. See them in Homeland.
This mathematical genius doesn't have time for small talk; Alan Turing needs to break Enigma, the Nazi's cipher machine. See them in The Imitation Game.
Buttercup is a farm girl turned princess who'd do anything to have her old life back. See them in The Princess Bride.
Love Quinn is a trained chef and excellent girlfriend, but she's hiding something dark. And bloody. See them in You.
It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.
Jane Smith is a stone-cold killer, but you would never know it from looking at her. See them in Mr. & Mrs. Smith.
While Fantine's gentleness has led others to take advantage of her, it ultimately forces her to become stronger. See them in Les Miserables.
A company man who has never done a day of work, Creed Bratton pursues sketchy extracurricular activities that keep him busy. See them in The Office.
Miss Havisham is the creepiest old rich lady in town. See them in Great Expectations.