Because you like Inigo Montoya in The Princess Bride
If Lisbeth Salander can hurt a bastard who deserves it by digging up stuff about him, she feels good. See them in The Girl with the Dragon Tattoo.
Suzaku Kururugi defeats enemies with his flashy but deadly jump kicks. But he's willing to sacrifice himself for peace. See them in Code Geass.
Part of an elite team of investigators, Abby Sciuto is the happiest Goth to ever work in law enforcement. See them in NCIS.
Jean-Baptiste Grenouille may have a phenomenal sense of smell, but he has a weak sense of morality. See them in Perfume: The Story of a Murderer.
Quirky and wildly imaginative, Amelie finds joy in the unnoticed things in life and aspires to bring happiness to all. See them in Amelie.
Summer Roberts is privileged and preppy but also surprisingly open-minded and fiercely loyal. See them in The O.C..
Lying is the most fun a girl like Alice can have without taking her clothes off. See them in Closer.
Claire Underwood is scary intimidating, and she knows it. See them in House of Cards.
There are men who embrace destiny and do not show their fear. These are the ones that change the world forever. See them in Dragon Age Series.
Ariel knows there's a whole other world above the sea, but exploring it comes at a big price. See them in The Little Mermaid.