Harley Quinn, Margot Robbie

Warner Bros.

This "Birds of Prey" shortlist is very encouraging.

Margot Robbie's Harley Quinn will lead an ensemble of DC stars in the spinoff "Birds of Prey." She previously described the film to Moviefone as an "R-rated girl gang film." Past reports have noted Robbie's role behind-the-scenes, including pushing for diversity in casting.

Now The Hollywood Reporter has revealed the reported frontrunners who have tested or been considered for key roles in the supervillain film.

Warner Bros. will be making casting decisions within the next two weeks, THR reported, since filming is expected to start in early 2019, with Cathy Yan as director.

Deadline also added their two cents -- seconding that Huntress, Rene Montoya, and Black Canary would be a part of Harley Quinn’s all-girl gang. "They take on Batman villain Black Mask, with the help of Cassandra Cain."

According to THR, two of the stars being considered are "Black Mirror" alumni Gugu Mbatha-Raw ("San Junipero") and Cristin Milioti ("USS Callister").

Mbatha-Raw is said to be in the running for Black Canary, along with Jurnee Smolett-Bell ("Underground") and possibly Janelle Monae.

Cristin Milioti, also known from "How I Met Your Mother" and "Fargo," is said to have tested or read for the role of Huntress. She'd be up against Margaret Qualley ("The Leftovers") and Mary Elizabeth Winstead ("10 Cloverfield Lane," "Fargo"). Deadline also added Sofia Boutella ( "The Mummy") to the list of Huntress candidates.

For the role of Gotham City detective Renee Montoya, THR said Justina Machado ("One Day at a Time," "Six Feet Under") and Roberta Colindrez ("Vida," "I Love Dick") both tested.

THR said Warner Bros. is looking to cast Cassandra Cain -- who took on the role of Batgirl for a while -- as a 12-year-old girl. The character is of Asian decent in the comics, and they are looking to cast a young Asian actress in the role.

That's a tough lineup to choose from. No one has asked for our feedback yet, but anytime you can get Mary Elizabeth Winstead in something, do it. Pair her with either Gugu Mbatha-Raw or Janelle Monae (or find a way to add both), plus Justina Machado and Margot Robbie, and we're ready to go.

Official casting soon. Reports say filming is scheduled to begin mid-January in Los Angeles.

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