Sarah Duffy varies as a side character and a main character depending on the story she's set in.
A Cold Love Story
Sarah in "A Cold Love Story" is actually the antagonist of the story. She had an abusive childhood and one day her parents ran over a child, and it being blamed on her, she has to hide the body.
Sarah's past has been, so far, vague. She's stated that even though she wants to kill Ponder, she wants PuppetGAME to continue.
This Sarah is nicknamed Cold and is from a version of A Cold Love Story where she kills John.
- C-ACLS is an acronym for "A Cold Love Story".