Because you like Drusilla in Buffy the Vampire Slayer
A suave manipulator, Sebastian Valmont is valiantly fighting off a developing conscience. See them in Cruel Intentions.
Samantha Jones is a try-sexual who'll try anything once. See them in Sex and the City.
In constant agony, Ava Starr will do anything to give up the superpowers that are slowly killing her. See them in Marvel Cinematic Universe.
Green skin, pointy hat, evil cackle—this villain has it all! See them in The Wizard of Oz.
Louis de Pointe du Lac is wanting to find a way of living that doesn't make him miserable. See them in Interview with the Vampire: The Vampire Chronicles.
Cat Grant gets what she wants: a piping hot latte or an interview with Supergirl. See them in Supergirl.
Logan Huntzberger is a daredevil, romantic, and heir to a media empire. See them in Gilmore Girls.
Christine Palmer is a great surgeon and an even better friend. See them in Marvel Cinematic Universe.
Merciless and manipulative, Queen Ravenna is determined to become the fairest of them all. See them in Snow White and the Huntsman.
Peter Venkman's "research" projects are designed to get undergraduate students to sleep with him. Though it turns out he can bust ghosts. See them in Ghostbusters.
Joe West is overprotective and secretive when his children are involved. See them in DC Extended Universe.