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The following are supporting characters in the Harry Potter series written by J. K. Rowling. For members of the Order of the Phoenix, Dumbledore's Army, Hogwarts staff, Ministry of Magic, or for Death Eater, see the respective articles.

The Dursley family are Harry Potter's last living relatives. To ensure Harry's safety, Albus Dumbledore placed him in the Dursleys' care when he was a baby. The Dursleys live at Number 4, Privet Drive, Little Whinging in Surrey, England. They are all Muggle, and despise all things related to magic – and anything out of the ordinary in general – and the Wizarding World, especially the Potters.

Vernon Dursley is Harry's uncle, having married his aunt Petunia. Vernon is described as a big, beefy man, looking somewhat like a walrus, with hardly any neck, and a large moustache. He is very much the head of his family, laying down most of the rules for Harry and doing most of the threatening, as well as spoiling Dudley. He is also the director of a drill-making firm, Grunnings, and seems to be quite successful in his career. He regularly reads the Daily Mail.

Uncle Vernon and his wife have grudgingly raised Harry from an early age. He and Petunia were often hostile to Harry and never informed him about the magical world, including how his parents died; instead explaining it away as a car crash. Vernon detests Harry to the degree of locking him up as a form of punishment. During the summer of Harry's second year of Hogwarts, Vernon puts bars on Harry's window to keep him at 4 Privet Drive. His plan is soon thwarted by the Weasleys, who rescue Harry in their father's flying car. Vernon also has an aversion to imagination, to any references to magic, and anything out of the ordinary.

Gellert Grindelwald has not been a contender in any CBUB matches.