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In the mid-2000s, local rapper Serengeti imagined rapping as a character named Kenny Dennis, a 50-something with a thick mustache and an even thicker Chicago accent. Ever since Kenny made his debut on the 2006 single “Dennehy,” he’s become the protagonist of a sprawling universe spread out among a panoply of albums, some credited to Serengeti and others supposedly made by figures in Kenny’s fictitious universe.…