So here's my fancast for Batman. I am aware that some of these actors have already appeared in comic book films, but since this is just for fun, I don't care.
Wes Bently | Batman / Bruce Wayne
Sam Neill | Alfred Pennyworth
Courtney B. Vance | Commissioner Gordon
Robert Pattinson | Nightwing
Amber Stevens West | Batgirl
Dennis Haysbert | Lucius Fox
Ben Mendelson | The Joker
Gugu Mbatha-Raw | Catwoman
Byung-hun Lee | Two-Face
Paul Dano | The Riddler
Mathieu Amalric | The Penguin
Adam Driver | The Scarecrow
Stellan Skarsgård | Mister Freeze
Evan Rachel Wood | Poison Ivy
Hafþór Júlíus Björnsson | Killer Croc
Rhys Darby | The Mad Hatter
Keanu Reeves | Deadshot
Udo Kier | Hugo Strange
Charles Grodin | The Ventriloquist
John Carroll Lynch | Professor Pyg
Nick Nolte | Rupert Thorne
Alexander Siddig | Ra's Al Ghul