Agnes is the youngest and sweetest of three sisters who have spent most of their lives at Miss Hattie's miserable orphanage.  Agnes has an endearing innocence, and an overpowering love of unicorns.  She often finds herself the target of teasing by her older sister Edith, while she is also closely protected by her oldest sister Margo.  However, she can be a tough and brave little girl when the situation calls for it, and she has a scream that can stop a monster dead in its tracks!