Tanya was a temporary person created by Temporary Solutions. She worked at HQP and was friends with Stacey Newman.
She was given additional security duties by Elaine Hartwell and pulled a gun out on intruders Yvonne Hartman and Ianto Jones, prompting them to flee with Stacey. Ianto killed her by overloading her brain with information. (AUDIO: 9 to 5)