Fake Harley is a henchgirl replacement for the Joker in The New Batman Adventures. After Joker inherited millions of dollars from a mob kingpin King Barlowe, he hired her to be a replacement for the original Harley Quinn, since it was cheaper to hire a new one rather than buy the old one out of Arkham Asylum. The Joker soon hires "Fake Harley" though he quickly regrets it after discovering she has a very annoying voice and laugh (and also a tendency to pronounce "Mr. J" as "Mr. G").
When the Joker found out that his fortune was all fake and that King Barlowe had given him the money as an elaborate prank, he, along with Fake Harley and some goons went to commit robberies to gain enough money to pay his taxes. When Batman found out about Joker's plan and captured Joker, Fake Harley was arrested as well.
- When Fake Harley was arrested, it is revealed that she has black hair.
- Fake Harley has a bad habit of calling Joker "Mr. G" instead of "Mr. J", which gets on Joker's nerves. She also has an annoying voice and laugh. These attributes nearly made Joker kill her and even made him miss the original Harley Quinn.