Juliet
Juliet Van Heusen is a 2,193 (now 2,194) year old vampire in her teenage years who begins a relationship with Justin and also becomes friends with Alex. She is intelligent and watches what she eats, and her parents run the restaurant "Late Night Bite" on Waverly Place. She is taken prisoner by a Mummy and then gets into a battle with Alex's werewolf boyfriend Mason, each hurting the other and removing their powers. For Juliet, the side effect is that she loses her power of immortality and thus looks her true age. Juliet is portrayed by Bridgit Mendler.
For more information please visit Wikipedia and Juliet's page on the Wizards of Waverly Place Wiki.