Valerie is the steam-driven automaton prostitute built by Stewie's Sherlock Holmes in order to catch a murderer whose victims names start with "V" in "V is for Mystery".
She catches the eye of Cleveland Brown's 'John', but Stewie directs to specify "no blacks." She is successful in drawing out Constance, played by Lois who is Brian's Dr. Watson's fiancee and the murderer who wrecks her, as Cleveland notes that he would have been a perfect gentleman.
Valerie is voiced by Alex Borstein.