India Amarteifio Photo: NETFLIX‘Bridgerton” isn’t exactly “Downton Abbey,” or Coca-Cola, but it is certainly a brand, one poised to provide ample opportunities for prequels, sequels, different flavors and, to judge by “Queen Charlotte: A Bridgerton Story,” even a diet option, if storylines had calories. The original series, based on Julia Quinn ’s fanciful period novels, has thus far been Royalty Lite, but has included a colony’s worth of characters, many of whom could be the subject of their own spinoffs. Queen Charlotte: A Bridgerton Story Thursday, Netflix“Queen Charlotte,” developed by star producer Shonda Rhimes , concerns the imperious sovereign (Golda Rosheuvel) who ruled over the first two seasons of the original “Bridgerton” and has reason to be tart: Her husband, George III , is mad. Her feckless son is running the country. And she distracts herself by manipulating the social hierarchy, atop which she presides with her outlandish headpieces aspiring further heavenward, like the spires on a cathedral.

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