Keoghan added, "You build the character up before production, get familiar with their world, build a mood board, listen to the music they do, kind of dress like them, answer all the copybook questions you've written down — and then go on set and let the instincts take over." While we've already had plenty of iterations of the clown prince of crime, Reeve's unique origin for the character will undoubtedly play a role in Keoghan's supposedly fresh way of portraying the character.