Most villains are used as plot devices to build and shape the story of the hero, but some antagonists are so intriguing by themselves that they completely overshadow the main character. Charismatic villains are the car crash of characters; horrible, disturbing, and yet impossible to look away from. Despite committing unspeakable and irredeemable crimes, each person has a largely intangible quality that draws the eye of viewers everywhere.
To be charismatic, villains must possess some form of attraction or charm, no matter how twisted, that can influence those around them by sheer force of their personality. They are complex, clever individuals who build unique and complicated relationships with the main characters.