Because you like Kathryn Janeway in Star Trek Voyager
Blair Waldorf
2161
Manipulative, gorgeous, and sharp as a tack, Blair Waldorf is a classic product of the Upper East Side. See them in Gossip Girl.
Jareth the Goblin King
1906
Although Jareth seems like he's just a harmless romantic, his powers make him a formidable foe. See them in Labyrinth.