Rebekah Mikaelson
Rebekah portrayed by Claire Holt in season three, is Klaus and Elijah's younger sister and also an original vampire. Rebekah shares a deep bond with her brother Klaus, and was the only family member that remained loyal to him despite his vicious behavior. Klaus thus kept her by his side, while he kept the rest of his family staked and stored away in boxes for hundreds of years. She had a romantic interest in Stefan Salvatore during their encounters in the early 1920s. However, when Klaus and Rebekah were once again forced to go on the run after the arrival of their vengeful father Mikael, Rebekah professed an interest to stop going on the run and live a stable life with Stefan by her side. Klaus subsequently forced her to choose between him and Stefan, and she chose the former. Eventually, Klaus daggers Rebekah. He brings her back to life during the period in which the show takes place, in order to obtain her necklace (which is originally Esther's). The same necklace had been gifted to Elena by Stefan in season one. Rebekah and Klaus thus head to Mystic Falls. Rebekah develops a deep hatred and envy of Elena, and continually tries to hurt, kill, and emotionally distress her, until her brother makes her stop. Later on, Rebekah is once again daggered by Elena, to simplify the Salvatores' plans of killing Klaus. Elena makes a deal with Klaus for her to reveal Rebekah's location, while Klaus promises not to harm Jeremy. He takes her body with him. She is eventually undaggered by Elijah. During her time in Mystic Falls, Rebekah enrolls at the local high school, much to the disgust of Elena and her friends. There, she at first makes romantic advances towards Tyler Lockwood, Caroline Forbes's boyfriend. She later develops a fondness for Matt Donovan, and invites him to her family's ball. Rebekah is shown to be lonely and insecure, though she hides this by being cruel and violent. This is demonstrated quite well through her sexual rendezvouses with Damon Salvatore, an enemy of her family, and the subsequent torture she makes him endure upon being betrayed by him. Rebekah's body is temporarily taken over by her witch mother, Esther, through a spell which Esther performs. She invades Rebekah's body in order to be able to go unnoticed while scheming to kill all of her Original children. Esther later leaves Rebekah's body and stakes her. However, Klaus restores Rebekah to full vitality by removing the stake. In the season 3 finale, while Matt is driving Elena back to Mystic Falls, after trying to escape with her, Rebekah is seen standing in the middle of Wickery Bridge. Matt sees her, loses control, and drives the car in the lake, which ultimately results in Elena's death and subsequent transformation into a vampire. Rebekah will be a series regular in season 4.