Because you like Matt Flamhaff in 13 Going on 30
Big Boss is a disillusioned mercenary commander who wants to create a world for soldiers (and soldiers alone). See them in Metal Gear Series.
If anyone can stay optimistic and friendly under harsh alien rule, it's Alyx Vance. See them in Half-Life 2.
Jack Bauer is a terrorist fighter who is scared of nothing and no one. The clock is ticking! See them in 24.
Known as the "rat king" of Paddy's Pub, bartender Charlie Kelly spends most of his time drinking at his bar instead of serving drinks to customers. See them in It's Always Sunny in Philadelphia .
Stoic, cynical, and independent, Homura Akemi is an alluring enigma. See them in Puella Magi Madoka Magica.
When a half-breed breaks the rules, John Constantine deports them straight back to hell. He's trying to buy his way into heaven. See them in Constantine.
Kind and friendly, Rinoa Heartilly is nonetheless an effective freedom fighter. See them in Final Fantasy Series.
L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.
Lelouch vi Britannia is a high school student by day, masked destroyer of tyrannical empires by night. See them in Code Geass.
Vash might act like a carefree, peace-loving goof, but it's not wise to underestimate this "Humanoid Typhoon." See them in Trigun.
Ciel Phantomhive is a haughty teenage nobleman who doesn't suffer fools gladly. See them in Black Butler.