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Short Stories from Hogwarts of Power, Politics and Pesky Poltergeists (Pottermore Presents) - J.K. Rowling

These are not so much short stories about but character sketches, almost as if Rowling was showing her character sheets for Umbridge and Slughorn among others. The highlights are also a list of the Minsters of Magic, which includes some funny tidbits. If you are a Harry Potter fan, these are worth a read and nicely add to the universe.