Clara

Clara, or the well-known thief Psiren, is a nurse at a hospital in the city of Aquroya by day and a thieving beauty by night. When she first met Edward and Alphonse, she was giving Ed a shot for food poisoning. Al thought she was a lot like their mother in a way, and felt she was a very kind person at heart.

Later, when her identity was revealed to them when Ed accidentally saw she had a transmutation circle on her chest like Psiren, she told them a story about how the hospital was to be demolished, and she was only stealing to keep the hospital's fate from becoming a reality. Because of this story, Ed helped her escape a trap the police had set for her, in hopes she could save the hospital. The Elrics had high hopes for her... until the next morning when they discovered the hospital had been destroyed anyway.