Robin Williams
The parts of the Joker and Riddler were once offered to the late, great Robin Williams, but he could not accept them due to various factors. Williams, who tragically departed away in 2014, left behind a life and legacy filled with happiness and excitement for nearly everyone who knew him.
It was uncommon for any of his Hollywood colleagues to express unpleasant words about him. He certainly struggled with his own mental health, but it didn’t stop him from spending decades providing millions of people with entertainment. Williams, sadly, never had the chance to play the lead in a major superhero movie.