Harley Quinn

"Do you cuties need some counseling? I'm a trained therapist."

- Harley Quinn to John Diggle and Lyla Michaels.

Harley Quinn is a disregarded member of the Suicide Squad. She had been deemed too deranged to be trusted on the Suicide Squad's mission to appropriate the nerve agent from Gholem Qadir in Markovia.

Biography
While John Diggle and Lyla Michaels were arguing outside of A.R.G.U.S. holding cells, Harley Quinn offered to help them through their problems, claiming she was a trained therapist. Amanda Waller hit her door to silence her.

Arrow
Season 2 Season 3
 * {{Ep|Draw Back Your Bow|(mentioned)}

Behind the scenes
"I want to manage expectations with respect to Harley Quinn. She was always intended to be an Easter egg. I don’t want people to go in with incorrect expectations and walk away from Episode 16 disappointed.  But there is an element to the Easter egg that was not spoiled by the promo, that I think people will find a lot of fun."

- Marc Guggenheim[src ]


 * Producer Marc Guggenheim admitted that although the character was indeed Harley Quinn, a long-time enemy of Batman, the character was simply an easter egg for fans.
 * Harley is voiced by Tara Strong, who uses the voice she uses for Harley Quinn in the Batman: Arkham games and Injustice: Gods Among Us.
 * In the 2011 rebooted comic incarnation of the Suicide Squad, Harley Quinn appears as a member.
 * According with Stephen Amell, Harley was planned to appear in the Season 2 finale, "Unthinkable"; but the scene was cut due to time.
 * Also, Andrew Kreisberg revealed that there were plans for the character to appear. However, Willa Holland stated that they had been axed due to the Suicide Squad film.