Kai Parker Is the Best Villain in The Vampire Diaries Franchise

One of the main reasons Kai is the best villain is because, unlike characters like Klaus and Katherine, he has never been a redeemable character. Though there was a slight change in his personality when he merged with Luke in season six of TVD, he always goes back to his villainous ways in the end. As creator Julie Plec puts it, Kai is "forever an irredeemable assh*le." His sociopathic tendencies make him incredibly unpredictable, but that much more entertaining to watch.