‘Gotham City Sirens’ Villain Revealed; Here’s The Big Bad Harley Quinn & Co. Might Face

"Gotham City Sirens" is currently in development, and David Ayer is on board to direct and with Margot Robbie reprising her role as Harley Quinn. Ayer recently teased the appearance of a particular character in the movie that may or may not be Harley's main nemesis.

Ayer took to Twitter to share a photo of Roman Sionis, also known as Black Mask. The photos are taken from the 2006 Batman story titled "Under the Red Hood." According to Comicbook, the said comic centers on the resurrected Jason Todd's return to Gotham as he wages war on Black Mask's criminal empire.

The Black Mask is no stranger to the DC Comics Extended Universe community. He was previously rumored to be the main villain in "The Batman," as he is primarily a Batman villain in the comics.

Interestingly, Black Mask also has a heated rivalry with Catwoman, one of the three main characters in "Gotham City Sirens." IGN reported that the Black Mask and the Catwoman are rival crime bosses in Gotham.

Meanwhile, only Robbie has been confirmed to star in "Gotham City Sirens" so far. The studio is still looking for actresses to portray Catwoman and Poison Ivy. It was previously rumored that "Transformers" actress Megan Fox is the top contender to play the role of Poison Ivy.

There are also rumblings that Jared Leto would return as The Joker in "Gotham City Sirens." The Joker was one of the prominent characters in the promotional material for "Suicide Squad," but his role in the actual movie was not as big as expected. This caused massive backlash among fans, so "Gotham City Sirens" could allow for Ayer to correct what was lacking in "Suicide Squad."

"I'm trying to make that happen. Not for anything specifically, but just something - there's so much more to do," Robbie said about Harley Quinn and The Joker's reunion in "Gotham City Sirens." Geneva Robertson-Dworet is writing the screenplay for "Gotham City Sirens."

A "Suicide Squad" sequel is also being discussed at Warner Bros., especially following the movie's Academy Awards win. A spinoff for Will Smith's character, Deadshot, is also being considered.