Because you like Minerva McGonagall in Harry Potter Series

Amy Townsend rarely wakes up in the same bed twice. See them in Trainwreck.

A fourth grader without a moral compass, Eric Cartman lives on KFC, Taco Bell, Pizza Hut, and Cheesy Poofs. See them in South Park.

A reformed former outlaw, John Marston doesn't want any trouble, yet somehow trouble always seems to find him. See them in Red Dead Redemption.

Big Boss is a disillusioned mercenary commander who wants to create a world for soldiers (and soldiers alone). See them in Metal Gear Series.

Though he has a brilliant mind for mathematics, Christopher has a much harder time processing the rest of the world. See them in The Curious Incident of the Dog in the Night-Time.

Quint is a grizzled shark hunter with a love of the sea. See them in Jaws.

With an A.I. as loyal and witty as Cortana, who needs humans? See them in Halo.

For Kazuya Mishima, the power of the Devil is now his and his alone. See them in Tekken .

After Rintarou Okabe develops the Phone Microwave, some of his fantasies start to seem uncomfortably real. See them in Steins;Gate.

It's certainly easier to get great footage of crimes when you can guarantee they'll happen. See them in Nightcrawler.

Did he ever tell you the definition of insanity? Just wait, and this psychopath will do just that. See them in Far Cry 3.

Tyler Gage is going to have to step up soon on the dance floor. Otherwise, it's back to janitorial work. See them in Step Up.