Because you like Crowley in Supernatural
There is never a dull moment with Jim Moriarty: expect booze and sing alongs in between all of the homicide. See them in Sherlock.
Emma Frost's superpower: transforming her body into an unbreakable diamond. See them in X-Men Series.
There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.
As a doctor-in-training, John Dorian should have his head in the game. But most of the time, it's in the clouds. See them in Scrubs.
Dean Forester is just your friendly, neighborhood grocery bag boy. See them in Gilmore Girls.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
Jenny Flint is a devoted wife and daring crime fighter, which is pretty unconventional for a Victorian maid. See them in Doctor Who.
There can be no doubt that Ben Linus is a huge liar. But one man's lies are another man's necessary steps to protect his people. See them in Lost.
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.
Joe West is overprotective and secretive when his children are involved. See them in DC Extended Universe.