She is represented by the Watanabe Entertainment talent agency. Her nickname is Shokotan (しょこたん).
Born as Nakagawa Shiyouko (中川しようこ, her name was not registered in a koseki (Japanese family registry) as Shoko (しょうこ) as she had been using for most of her life), she was raised by her mother in Nakano. She made her entertainment debut in 2001, winning the Grand Prix award at the Popolo Girl Audition and representing the Jackie Chan talent agency. In 2002, she was chosen as Miss Shōnen Magazine.
The picture above is from the ending theme of the Fullmetal Alchemist remake (review soon!)