Question: Who first appeared in the first novel in the "Harry Potter" series?

Context paragraphs:
Lego Harry Potter: Years 5–7: 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 (film): Harry Potter and the Philosopher's Stone (released in some countries as Harry Potter and the Sorcerer's Stone) is a 2001 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros.  Pictures.  It is based on the novel of the same name by J. K. Rowling.  The film is the first instalment in the long-running "Harry Potter" film series, and was written by Steve Kloves and produced by David Heyman.  Its story follows Harry Potter's first year at Hogwarts School of Witchcraft and Wizardry as he discovers that he is a famous wizard and begins his education.  The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger.

Fantastic Beasts and Where to Find Them: 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.

Lord Voldemort: Lord Voldemort ( , or in the films; born Tom Marvolo Riddle) is a fictional character and the main antagonist in J. K. Rowling's series of "Harry Potter" novels.  Voldemort first appeared in "Harry Potter and the Philosopher's Stone", which was released in 1997.  Voldemort appears either in person or in flashbacks in each book and its film adaptation in the series, except the third, "Harry Potter and the Prisoner of Azkaban", where he is only mentioned.

Harry Potter and the Philosopher's Stone: 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.

James Potter (series): The James Potter series is an unofficial sequel-series of J.K. Rowling's Harry Potter universe, written by G. Norman Lippert.  The novel series centers around the character of James Sirius Potter, Harry Potter's son, a character who makes a fleeting appearance in the novel "Harry Potter and the Deathly Hallows".  The series starts with his first year at Hogwarts, set one year before the end of the Harry Potter series.

Lego Harry Potter: Years 1–4: 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, "".

Lego Harry Potter: Lego "Harry Potter" is a Lego theme based on the films of the "Harry Potter" series.  Lego models of important scenes, vehicles and characters were made for the first six films and all the books released.  The first sets appeared in 2001, to coincide with the release of the first film "Harry Potter and the Philosopher's Stone" (Harry Potter and the Sorcerer's Stone in the United States).  Subsequent sets were released alongside the new films, until Harry Potter and the Order of the Phoenix.  The line then went dormant for three years.  It is unknown if the theme will again be revived to coincide with future installations in the Harry Potter franchise, such as the film Fantastic Beasts and Where to Find Them.

Harry Potter and the Deathly Hallows: 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.

Harry Potter and the Forbidden Journey: Harry Potter and the Forbidden Journey is a motion-based dark ride located in The Wizarding World of Harry Potter themed areas of Islands of Adventure in Orlando, Florida, Universal Studios Hollywood in Universal City, California, and Universal Studios Japan in Osaka, Japan.  The ride takes guests through scenes and environments in and around Hogwarts Castle from the Harry Potter series of books and films.  Mark Woodbury, president of Universal Creative, described the ride as an in-depth look at the world of Harry Potter, which utilizes never-before-seen technology which transforms "the theme park experience as you know it".  The ride first opened at Islands of Adventure with "The Wizarding World of Harry Potter" on June 18, 2010, at Universal Studios Japan on July 15, 2014, and at Universal Studios Hollywood on April 7, 2016.

Supporting paragraphs: Lord Voldemort Harry Potter and the Philosopher's Stone
Answer: Lord Voldemort