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Akuma, who was never in the film, was featured in Street Fighter: The Movie because he was a great character according to game designer Alan Noon. He was almost not included for fears that Akuma wasn't widely known as of yet. Not only did he appear in the arcade but also in Capcom's console remake Street Fighter: Real Battle On Film as a hidden character.
No information other that the arcade version ending is given on Akuma's story. Akuma is played by Ernie Reyes Sr.