Sheska (シェスカ, Shesuka) was a librarian at the First Branch of the Central City library. Because she spent all day reading the many documents stored there instead of doing her job, she was fired. She has a photographic memory and can remember and reproduce anything she has ever read with word-for-word accuracy. Because of this, the Elric brothers seek her out after the library burns down to see if she can remember any research papers by Tim Marcoh. She transcribes the entirety of his research for them, earning enough pay to last her a year for her troubles. When Maes Hughes learns of how she helped the Elrics, he hires her to help recreate the criminal records that were destroyed in the fire. In the anime, after Hughes' death, Sheska helps Winry Rockbell discover the identity of Sloth.

Source: Wikipedia