Clarissa Dragomir the Saviour

Clarissa is a Moroi so powerful that no Moroi, Dhampir, or Strigoi can keep up and that's good because living on the streets when strigoi are after you its a hard life and at any moment could turn into death. When Clarissa meets Lissa, Rose and Dimitri she has to learn to trust, which is something she hasn't done since she started living on the streets (set just after the #1 book).