Question: In the "Harry Potter" series created by who, many fictional magical creatures exist in the series, while ordinary creatures sometimes exhibit new magical properties in the novel's world?
Context: Rubeus Hagrid is a fictional character in the "Harry Potter" book series written by J. K. Rowling.  He is introduced in "Harry Potter and the Philosophers Stone" as a half-giant and half-human who is the gamekeeper and Keeper of Keys and Grounds of Hogwarts, the primary setting for the first six novels.  In the third novel "Harry Potter and the Prisoner of Azkaban", Hagrid is promoted to Care of Magical Creatures teacher, and is later revealed to be a member of the Order of the Phoenix. Lego Harry Potter: Years 1–4 is a Lego-themed action-adventure video game developed by Traveller's Tales and published by Warner Bros.  The game is based on the Lego Harry Potter line and its storyline covers the first four films in the "Harry Potter" series: "Harry Potter and the Sorcerer's Stone", "Harry Potter and the Chamber of Secrets", "Harry Potter and the Prisoner of Azkaban", and "Harry Potter and the Goblet of Fire".  The game is available on the Wii, Xbox 360, PlayStation 3, Nintendo DS, PlayStation Portable, Microsoft Windows, OS X, iOS and Android.  The OS X version of the game was released on 22 February 2011 by Feral Interactive.  The game was released for the PlayStation 4 on October 21, 2016, as part of the "Lego Harry Potter Collection", which bundles the game with its sequel, "". Harry Potter and the Deathly Hallows is the seventh and final novel of the "Harry Potter" series, written by British author J. K. Rowling.  The book was released on 21 July 2007, ten years after publication of "Harry Potter and the Philosopher's Stone" (1997), by Bloomsbury Publishing in the United Kingdom, in the United States by Scholastic, and in Canada by Raincoast Books, ending the series that began in 1997 with the publication of "Harry Potter and the Philosopher's Stone".  The novel chronicles the events directly following "Harry Potter and the Half-Blood Prince" (2005), and the final confrontation between the wizards Harry Potter and Lord Voldemort, as well as revealing the previously concealed back story of several main characters.  The title of the book refers to three mythical objects featured in the story, collectively known as the "Deathly Hallows"—an unbeatable wand, a stone to bring the dead to life, and a cloak of invisibility. The Ministry of Magic is the government of the Magical community of Britain in J. K. Rowling's "Harry Potter" series.  First mentioned in "Harry Potter and the Philosopher's Stone," the Ministry makes its first proper appearance in "Harry Potter and the Order of the Phoenix".  Throughout the books, it is generally depicted as either corrupt, incompetent, or both, with its high officials blind to actual events and dangers.  It reaches a nadir of corruption before being effectively taken over by Lord Voldemort.  At the end of the final book, following Voldemort's death, Kingsley Shacklebolt takes over the ministry, changing it for the better.  By the time of "Harry Potter and the Cursed Child", Hermione Granger is the Minister for Magic. The Magical Worlds of Harry Potter: A Treasury of Myths, Legends, and Fascinating Facts is a guide to the fictional "Harry Potter" universe, written by David Colbert.  It explores the references to history, legends, and literature in J.K. Rowling's "Harry Potter" novels.  Colbert conceived the idea for "The Magical Worlds of Harry Potter" while quizzing his nephew and nieces about the mythological references in the novels.  He later wrote the book while teaching a seminar on self-publishing to graduate students at the University of North Carolina.  The book was published in March 2001, without approval from Rowling, and has since received positive reviews from critics.  An updated version of "The Magical Worlds of Harry Potter" was published in 2004 by Berkley Books. Fantastic Beasts and Where to Find Them is a 2001 book written by British author J. K. Rowling (under the pen name of the fictitious author Newt Scamander) about the magical creatures in the "Harry Potter" universe.  The original version purports to be Harry Potter's copy of the textbook of the same name mentioned in "Harry Potter and the Philosopher's Stone" (or "Harry Potter and the Sorcerer's Stone" in the US), the first novel of the "Harry Potter" series.  It includes several notes inside it supposedly handwritten by Harry, Ron Weasley, and Hermione Granger, detailing their own experiences with some of the beasts described, and including in-jokes relating to the original series. In the "Harry Potter" series created by J. K. Rowling, magic is depicted as a supernatural force that can be used to override the usual laws of nature.  Many fictional magical creatures exist in the series, while ordinary creatures sometimes exhibit new magical properties in the novel's world.  Objects, too, can be enhanced or imbued with magical property.  The small percentage of humans who are able to perform magic are referred to as witches and wizards, in contrast to the non-magical muggles. Magical creatures are a colourful aspect of the fictional wizarding world contained in the "Harry Potter" series by J. K. Rowling.  Throughout the seven books of the series, Harry and his friends come across many of these creatures on their adventures, as well as in the Care of Magical Creatures class at Hogwarts.  Rowling has also written "Fantastic Beasts and Where to Find Them", a guide to the magical beasts found in the series.  Many of these are derived from folklore, primarily Greek mythology, but also British and Scandinavian folklore.  Many of the legends surrounding mythical creatures are also incorporated in the books.  "Children ... know that I didn't invent unicorns, but I've had to explain frequently that I didn't actually invent hippogriffs," Rowling told Stephen Fry in an interview for BBC Radio 4.  "When I do use a creature that I know is a mythological entity, I like to find out as much as I can about it.  I might not use it, but to make it as consistent as I feel is good for my plot." Lego Harry Potter: Years 5–7 is a Lego-themed action-adventure video game developed by Traveller's Tales and published by Warner Bros.  Interactive Entertainment.  Released on 11 November 2011 in North America and 18 November in Europe, the game is based on the Lego Harry Potter line and is based on the final three books and four films in the "Harry Potter" series: "Harry Potter and the Order of the Phoenix", "Harry Potter and the Half-Blood Prince", "Harry Potter and the Deathly Hallows – Part 1", and "Harry Potter and the Deathly Hallows – Part 2".  The game was released for the PlayStation 3, Xbox 360, PlayStation Portable, PlayStation Vita, Wii, Nintendo DS, Nintendo 3DS, Microsoft Windows, iOS and Android.  The first trailer of three trailers was released 6 October 2011, and the demo was released on 1 November.  The game was released on Steam on 5 January 2012.  The OS X version of the game was released by Feral Interactive on 7 March 2012.  The game was released for the PlayStation 4 on October 21, 2016, as part of the "Lego Harry Potter Collection", which bundles the game with its predecessor, "". Harry Potter and the Philosopher's Stone is the first novel in the "Harry Potter" series and J. K. Rowling's debut novel, first published in 1997 by Bloomsbury.  It was published in the United States as Harry Potter and the Sorcerer's Stone by Scholastic Corporation in 1998.  The plot follows Harry Potter, a young wizard who discovers his magical heritage as he makes close friends and a few enemies in his first year at the Hogwarts School of Witchcraft and Wizardry.  With the help of his friends, Harry faces an attempted comeback by the dark wizard Lord Voldemort, who killed Harry's parents, but failed to kill Harry when he was just 15 months old.
Answer: J. K. Rowling