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The most well known vampire (in the Harry Potter series) would be Sanguini, who appeared at one of Slughorn's parties in Harry Potter and the Half-Blood Prince. However, there are several vampires mentioned on various chocolate frog cards and the Wizard of the Month feature on J.K. Rowling's site. Also, according to Luna Lovegood, Rufus Scrimgeour is a vampire, although this is most likely false. Edward is a very retarded vampire.