Batman: Born Into Darkness is a hypothetical film I am developing. The most I will do is write a script and do a fan-cast. No actual film will be made, and I will eventually make an extended universe.
Rules: This is what a DC film would be like if I had unlimited resources, so I won't be casting any deceased actors or actresses because this is grounded in reality, so despite me wanting Heath Ledger as Deadshot, I can't. I also am not casting people who have portrayed those specific characters before in any way, including voicing. So I can't cast David McCallum as Alfred Pennyworth because he voiced Al in the DCAMU and Batman: Gotham Knight, and I can't cast Matthew Gray Gubler as The Riddler because he voiced Ed in Assault on Arkham. Finally, I can't cast Jensen Ackles as Jason Todd, because he voiced him in Batman: Under The Red Hood. These are just a few examples, so if you think there's a better choice for a cast, check to see if they've voiced them before.
Part 1: The Cast.
Fan-Cast:
Frank Grillo: Batman.
Jon Hamm: Thomas Wayne.
Michelle Pfeiffer: Martha Wayne.
James Woods: Alfred Pennyworth.
Lennie James: Lucius Fox.
Michael C. Hall: James Gordon.
Amanda Seyfried: Vicki Vale.
Scott Eastwood: Dick Grayson.
Emma Watson: Barbara Gordon.
Leonardo DiCaprio: Thomas Elliot.
Jeff Goldblum: Edward Nygma.
James Mcavoy: Viktor Szasz.
Matthew McConaughey: Harvey Dent.
Christopher Walken: Johnathan Crane.
Guy Pearce: Basil Karlo.
Jeremy Irons: Carmine Falcone.
Andrew Garfield: Alberto Falcone.
David Zayas: Tony Zucco.
William Shatner: Rupert Thorne.
Al Pacino: Sal Maroni.
Sylvester Stallone: Black Mask.
Clancy Brown: The Penguin.