Katherine Pierce

Katherine Pierce, born Katerina Petrova (Bulgarian: Катерина Петрова) was a witch of the Traveler sub-culture and a former main character of The Vampire Diaries. She was also the second-known Petrova Doppelgänger of Amara and a former vampire. She was the main antagonist of season one (mostly off-screen through John Gilbert's and Isobel's actions, as both were working for her in order to kill off the tomb vampires), and one of the main antagonists of season two, the second half of season four and the first half of Season Five. She was also the final antagonist of season eight. Katherine can be considered the main antagonist of the series overall due to being a major antagonist in the first, second, fourth, fifth and eighth seasons and all the antagonists that were a result of her actions.