20) Robson Green (Sirius Black)

The tone of the movies got darker with Christopher Columbus getting replaced by Alfonso Cuaron as the director in Prisoner Of Azkaban. Before Christopher departed from the iconic movie series, he suggested casting Robson Green for the role of Sirius Black. However, the role was eventually given to Gary Oldman who made the character come to life and became an icon for all the potterheads.
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Edited by Nimisha