Because you like Robert Chase in House M.D.

Gilderoy Lockhart's biggest idol is himself. See them in Harry Potter Series.

A reclusive introvert, Liz Sherman has a temper that's literally lethal. See them in Hellboy.

A blood-thirsty warrior on the battlefield, Ragnar Lothbrok is a dedicated family-man at home. See them in Vikings.

Morpheus is wise enough to see into the bones of the world. See them in The Matrix.

On the outside, Gwen seems meek and calm. But she has an inner core of steel. See them in Merlin.

Merlin is half awkward teenager, half super-powerful wizard. He serves Prince Arthur of Camelot during the day and illegally learns magic at night. See them in Merlin.

Donna is boisterous and spunky traveller of the TARDIS, exploring worlds beyond the simple mundane enterprises of Earth. See them in Doctor Who.

Ianto Jones' withdrawn nature conceals his emotional pain. See them in Torchwood.

Felicity Smoak is a brilliant hacker who nonetheless becomes tongue-tied in front of attractive men. See them in DC Extended Universe.

Samantha Jones is a try-sexual who'll try anything once. See them in Sex and the City.

A suave demon, Crowley grants humans their wishes in exchange for their soul, only to find loopholes that benefit him. See them in Supernatural.

A bloodsucker, Carlisle Cullen is actually more likely to give you a blood infusion. See them in Twilight.