Because you like Winifred Burkle in Angel
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.
Helena is a mentally unstable, childish, and completely merciless. And most of all, she's an unstoppable killer. See them in Orphan Black.
Leonard "Bones" McCoy is passionate, moral, and ready to stitch you back together. See them in Star Trek.
Nicholas Angel is super-dedicated to his job as a police officer. Maybe a little too dedicated. See them in Hot Fuzz.
Mark Sloan is the best plastic surgeon and biggest playboy the hospital's ever seen. See them in Grey's Anatomy.
Though he may be blind, Chirrut Imwe sees the power of the force more than most. See them in Rogue One.
Aldo Raine is in the killing Nazi business. And as he says, business is a-boomin'. See them in Inglourious Basterds.
April Kepner is an excellent surgeon, but outside of the operating room, she's more anxious than most. See them in Grey's Anatomy.
Felicity Smoak is a brilliant hacker who nonetheless becomes tongue-tied in front of attractive men. See them in DC Extended Universe.
Both a noble district attorney and a psychopathic villain, Harvey Dent proves some men really can have it all. See them in DC Extended Universe.
Sometimes being a supportive girlfriend like Ophelia doesn't work out too well. See them in Hamlet.