Suicide Squad kicks off in cinemas on August 1 but the hype continues. Actress Margot Robbie, who plays Harley Quinn, talks about the film’s biggest secrets.

It must be a great opportunity for the actors being part of DC’s upcoming antihero film. Since DC has a massive fanbase, the avid fanatics also shows enthusiasm on the movie adaptations.

But of course, the lucky actors who got their roles on the superhero films like in DC’s need to emotionally and physically prepare. Like for example, Robbie’s preparation for the role of Joker’s girlfriend.

The Wolf of Wall Street actress revealed on USA Today how she practices Harley Quinn’s accent. Robbie said that she started on the source material.

The villain debuted in Batman: The Animated Series in 1992. Watching back the cartoon series, Harley Quinn has a high-pitched voice that works perfectly for her personality.

“She’s got a very high-pitched voice, which for the lighthearted stuff, the crazy stuff, works really well, but when it’s a pretty raw emotional scene, you lose the gravity when you’re speaking in such a high voice,” Robbie said.

Starting from that, the Australian actress researched for other references. Then, she bumped into actress Lorraine Bracco, who played mob wife Karen Hill in Goodfellas.

Robbie wanted to achieve that New York accent that Bracco has. So, in order to do that, she listens to Bracco’s scenes on her iPod before she goes to the Suicide Squad set.

The 26-year old actress explained that Bracco’s voice has a strong appeal. There is balance on the pitch and it comes from a “very real deep primal place.”

Aside from Robbie, other casts of the upcoming film also revealed on Good Morning America (via Comicbook) about their preparations.

First, Jay Hernandez talked about his eyebrows being shaved. Additionally, Adewale Akinnuoye-Agbaje talked about undergoing a five-hour process to become Killer Croc.

Furthermore, Robbie also spilled details about her co-actor Will Smith. She said that the actor does not know how to swim. But then, to remedy that, Smith had to do some swimming lessons.

Watch out for more news about Suicide Squad in the coming days.