Niklaus "Klaus" Mikaelson

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Niklaus Mikaelson, more commonly known as Klaus, is an original vampire, later the first hybrid and the main antagonist of season two and season three. He and his father, brothers and sister became the very first vampires after their mother, a witch, had cast a spell on them in order to protect them from werewolves. It was later found out that his mother had committed adultery and Klaus' biological father was a werewolf, which makes Klaus the only vampire/werewolf hybrid. However his werewolf powers were bound to the moonstone by a band of witches, which includes his mother. To release his werewolf powers a ritual, in which a werewolf, a vampire and a Petrova doppelgänger have to be sacrificed, has to take place. The first Petrova doppelgänger Klaus found was Katerina Petrova, but she escaped Klaus with the moonstone and hung herself in order to become a vampire, so that she would be useless for the ritual. Klaus then wanted revenge on Katerina, causing her to spend centuries running from him.