Because you like Christian Troy in Nip/Tuck
Kilgrave is a domineering, abusive boyfriend. Then, add in the power of mind control. See them in Marvel Cinematic Universe.
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
Samantha Jones is a try-sexual who'll try anything once. See them in Sex and the City.
Jenny Flint is a devoted wife and daring crime fighter, which is pretty unconventional for a Victorian maid. See them in Doctor Who.
This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.
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.
Omar Little is a pretty chill guy, as long as you can forgive the stealing and killing people. See them in The Wire.
Detective Alec Hardy doesn't let anyone get too close to him. See them in Broadchurch.
An all-business doc , Miranda Bailey dispenses tough love to the interns she trains. Emphasis on "tough." See them in Grey's Anatomy.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
You wouldn't know it by looking at her, but beneath Sheila Jackson's sweet, motherly exterior lies a sex addict. See them in Shameless.