Because you like Minerva McGonagall in Harry Potter Series

Firo Prochainezo is swept up in a world of mysterious women, alchemists, and rumors of a wine that makes it drinkers immortal. See them in Baccano!.

When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.

It's hard enough fighting a war. But it's worse for Commander Shepard, knowing no matter how hard you try, you can't save them all. See them in Mass Effect.

The only thing Albert Wesker cares about is turning himself into a God. See them in Resident Evil Series.

Sylar's victims are found all over the country, many with their brains removed. See them in Heroes.

Rose Hathaway is a reckless, rebellious smartass who's training to be a royal vampire guardian. See them in Vampire Academy.

Faith balances her adventurous thrill-seeking attitude with a righteous passion for justice. See them in Mirror's Edge.

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.

Will Herondale is an emotionally distant bad boy with a secret. See them in Clockwork Angel .

Everyone Barney Stinson knows is getting married or pregnant. But he's just getting more awesome. See them in How I Met Your Mother.

A super-soldier, Master Chief might be more machine than man. And for humanity's sake, thank God. See them in Halo.