Because you like Count Olaf in Lemony Snicket's A Series of Unfortunate Events

A self-professed psychopath, James kills small animals for fun. After getting bored of that, he is ready for an ambitious murder. See them in The End of the F World.

Irene Adler has to use both her brains and her body to survive. Luckily, she's usually the most brilliant person in the room. See them in Sherlock.

Driven yet empathetic, Emily Prentiss brings humanity to the pursuit of inhuman killers. See them in Criminal Minds.

Newt Scamander is more comfortable with animals than people, even if the animals are super-dangerous magical creatures. See them in Fantastic Beasts and Where To Find Them.

There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.

Donatello might come off as a tad nerdy, but don't let his geekiness fool you. He's a trained ninja and a skilled fighter. See them in Teenage Mutant Ninja Turtles.

Don't ask the ruthless queen of the Tokyo underworld any questions unless you're fine with losing a limb. See them in Kill Bill vol. 1.

Christian is a romantic who for some reason won't stop singing everything he feels. See them in Moulin Rouge.

Mr. Pink doesn't tip. Enough said. See them in Reservoir Dogs.

Prideful and psychotic tendencies combine to make Dr. Eggman a dangerous and villain who will squash anyone in his path. See them in Sonic the Hedgehog.

There's erratic, and then there's Senor Chang. See them in Community.

Paris Geller is a newspaper editor, class president, and headed for Harvard. See them in Gilmore Girls.