Buffy the Vampire Slayer
Anya Christina Emmanuella Jenkins, or Anyanka, or Aud (played by Emma Caulfield) was an 1100 year old vengeance demon. She was born with the name Aud somewhere in Scandinavia during the 9th century. She became a vengeance demon after casting a magic spell on her lover, Olaf. The spell turned him into a troll. Anya spent the next 1100 years as Anyanka. As a vengeance demon, she would use magic to give a wish to a woman who had been treated wrong by a man. Anyaka lost her powers during a wish she cast for Cordelia Chase. When the wish was ended, Anyanka was trapped in the human body of 17 year old Anya. Anya and Xander got together after graduation and later were engaged. But Xander left her at the wedding, realising he was not ready to get married, but still loved her. She then got her vengeance powers back from D'Hoffryn (head of vengeance) but later lost them again after she realized how unfulfilling maiming human men was (her human side).