'Suicide Squad' director David Ayer faced a tough challenge in casting an actor in the role of The Joker, but he's so proud of the charisma and depth brought to the character by Jared Leto. 

Chatting to the Rolling Stone about Leto's involvement in how this version of The Joker looks, Ayer explained:

"The basics for it were always gonna be the pale skin and the green hair. But he was very involved. And, you know, we did the tattoos, which are controversial, but, I mean, we wanted him to be of our world."

Referring to The Joker's girlfriend Harley Quinn, played by actress Margot Robbie, Ayer added that it gave the backstory and present narrative such a new and interesting dynamic:

"Exactly. And the idea that, you know, he's always been this lone wolf who has sort of henchmen, but never any real relationship with anyone. So, that was very interesting territory to explore."

"It was like, what is the nature of that relationship? What does it mean? What does it mean to the Joker? How does she define him and vice versa? So, there's a lot of really creative fertile ground to explore. He hates that he's obsessed with her and whether it's love or obsession, you know, people are gonna have to figure that out. She drives him crazy. And he tries to control her as much as possible, but she's pretty much uncontrollable."

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Watch Leto in action as The Joker below: