The Oscar winner reveals his Joker is inspired, at least in part, by music icon David Bowie, who passed away in January.
"I spoke to a writer and we discussed David Bowie a bit, not necessarily the music of David, but his class, his elegance, his timelessness," Leto told NME. "I don't wanna say who the guy was, but he's a famous writer in the world of DC. Bowie was definitely one of the people we spoke about."
Leto, who fronts his own band Thirty Seconds to Mars, added, "I think David Bowie is probably an inspiration for almost anything you could do creatively."
The actor also expressed interest in seeing the Joker star in his own film. "I think that would be great to dive in deeper to the Joker," he said, "and expand his story and learn a bit more about this sick and twisted -- but lovely -- strange man."
Leto previously expressed a desire to see his Joker go head to head with the Dark Knight in Ben Affleck's planned Batman film.
Written and directed by David Ayer, "Suicide Squad" is in theaters now.