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Sirius Black - a major character in J.K. Rowling's Harry Potter series, played by Gary Oldman in the films. He is Harry's godfather who can transform into a black dog. The character's name is a clever reference to the Dog Star, fitting his animagus form. The name Sirius is also featured in Sirius XM Radio company name, though spelled differently in ancient astronomy as 'Seirios'.
