6) Sirius Black

Sirius Black, portrayed by Gary Oldman, is yet another gem of a character deserving of more screen time. He was not only Harry's Godfather but also a pivotal figure in the battle against Voldemort. His deep affection for his family, his rebellion against his parents' oppressive views, and the complicated bond he shared with his cousin Bellatrix were all aspects that could have been further explored. However, the films didn't do justice to the depth of his character, given how little time he had on screen.
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Edited by Nimisha