Katerina Petrova / Katherine Pierce

Katerina Petrova is a fictional character from the hit TV series, The Vampire Diaries. Born June 22, 1473, Katherine is a Petrova doppelgänger, descended from Amara and Tatia. She is an ex-vampire and the ex-lover to both the Salvatore brothers, Damon and Stefan. She first appears as Miss Katherine Pierce in recurring flashbacks to 1864, which feature her romantic entanglements with the Salvatore brothers. She managed to turn them both into vampires, but was concurrently captured by the townspeople of Mystic Falls to be killed in Fells Church (where they planned to lock the vampires in before setting it alight).

Katherine Pierce (portrayed bu Nina Dobrev)

Behind her sweet-nature facade, a much more calculating side of Katherine is revealed through flashbacks in which she escaped certain death with the help of George Lockwood (and at the expense of all the other vampires in town) in 1864. After 145 years, Katherine returns to Mystic Falls, toying with the Salvatores again but clearly with a hidden agenda. Katherine earns no love after she turns Caroline Forbes into a vampire and uses a werewolf, Mason Lockwood, to retrieve a mysterious moonstone. Eventually she is exposed as a doppelgänger who has spent her immortal life fleeing from an Original vampire named Klaus. During Katherine's five centuries of life she became one of the most ruthless, notorious and infamous vampires in history.

 Let the bloodbath begin! Celebrate Halloween all October long
with a new vampire post every day! Who's your favorite?