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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 Eaters, see the respective articles.

Dear Hank & John is a podcast hosted by the Green brothers: musician and author Hank Green and young-adult novelist John Green. The podcast is produced by Rosianna Halse Rojas and edited by Josef "Tuna" Metesh. First released in June 2015, Hank and John Green answer questions e-mailed by listeners, give "dubious" advice and talk about the weekly news from the planet Mars and the 4th tier English football club AFC Wimbledon. Episodes are typically around 45 minutes in length. Upon the podcast's debut, it reached the number 4 position on the US iTunes performance chart and hit a peak position of number 2 two days later. Dear Hank & John has also been charted on iTunes in the United Kingdom, Germany, France, Italy, Canada, Spain, Australia and Brazil. The podcast is primarily funded through the crowdfunding website Patreon, though the majority of the pledges go towards the video production budget of Complexly. From November 2018 to November 2020, the podcast was a co-production of Complexly and WNYC Studios. As of November 16, 2020, Dear Hank & John is once again an independently produced podcast.

In ancient Greek mythology and religion, Selene is the personification of the Moon. Also known as Mene, she is traditionally the daughter of the Titans Hyperion and Theia, and sister of the sun god Helios and the dawn goddess Eos. She drives her moon chariot across the heavens. Several lovers are attributed to her in various myths, including Zeus, Pan, and the mortal Endymion. In post-classical times, Selene was often identified with Artemis, much as her brother, Helios, was identified with Apollo. Selene and Artemis were also associated with Hecate and all three were regarded as moon and lunar goddesses, but only Selene was regarded as the personification of the Moon itself. Her Roman equivalent is Luna.

Headgum is an American podcasting network founded in 2015 by Marty Michael, Amir Blumenfeld, and Jake Hurwitz. The latter two – known collectively as comedy duo Jake and Amir – built upon the success of their podcast If I Were You to launch the network, with the show serving as its flagship program. Before founding Headgum, Michael sold advertising space and branded content for CollegeHumor. Headgum has studios in Los Angeles and New York and, as of March 2019, hosts 57 shows, 34 of which are ongoing. Headgum also features an active YouTube channel and presents Headgum Live!, a series of live shows featuring podcast hosts from the network.

Bret Samuel Weinstein is an American podcaster, author, and former professor of evolutionary biology. He served on the faculty of Evergreen State College from 2002 until 2017, when he resigned in the aftermath of a series of campus protests about racial equity at Evergreen, which brought Weinstein to national attention. Along with his brother Eric Weinstein, he is considered part of the intellectual dark web. Weinstein has been criticized for making false statements about COVID-19 treatments and vaccines.

Helen Zaltzman is an English podcaster, broadcaster and writer. She produces the linguistics podcast The Allusionist, the entertainment podcast Answer Me This!, and the Veronica Mars recap podcast Veronica Mars Investigations.

Zaltzman began the comedy podcast Answer Me This! with Olly Mann in 2007. The duo met in 2000 studying at St Catherine's College, Oxford. The podcast began in Zaltzman's living room in Crystal Palace, London, with assistance from Martin Austwick (a.k.a. "Martin the Sound Man"). In 2009, Zaltzman and Mann made history by being the first podcasters to be given their own national show on BBC Radio 5 Live, Web 2009 with Helen and Olly. They went on to present several other specials for BBC 5 Live.

The Adventure Zone is a weekly comedy and adventure actual play podcast based loosely upon the Dungeons & Dragons game series, along with other role-playing games. The show is distributed by the Maximum Fun network and hosted by brothers Justin, Travis, and Griffin McElroy, and their father Clint McElroy. Regular episodes of the podcast feature the family solving puzzles, fighting enemies, and leveling up their characters in a series of cinematic and humorous encounters.

Prof. Albus Percival Wulfric Brian Dumbledore is a fictional character in J. K. Rowling's Harry Potter series. For most of the series, he is the headmaster of the wizarding school Hogwarts. As part of his backstory, it is revealed that he is the founder and leader of the Order of the Phoenix, an organisation dedicated to fighting Lord Voldemort, the main antagonist of the series.

Fangasm was a reality television show that screened on SyFy in 2013. The series followed seven people as they worked as interns for Stan Lee’s Comikaze Expo (now known as the L.A. Comic Con), and included guests such as Stan Lee and George Takei. Although some felt that the series handled the subjects well, Fangasm was criticised by Andy Khourio as "nakedly exploitive of geek culture", and was accused of being created in order to promote Comikaze.

Vanessa Zoltan is a humanist chaplain who describes herself as an "atheist chaplain". She is a graduate of Harvard Divinity School, and holds a BA in English and writing from Washington University in St. Louis, and a MS in nonprofit management from the University of Pennsylvania. She has been called one of "few" feminist humanist chaplains in the world.

MuggleNet is the Internet's oldest and largest Harry Potter and Wizarding World fansite. Founded in 1999, MuggleNet distinguished itself early on by its unique and comprehensive content. Barely one year after it was launched, the site was seeing hundreds of thousands of daily visitors each month at its peak. It has expanded over the years to include a handful of partner podcasts, a separate book blog, over half a dozen published works and live events. At one point, it also ran its own forums, social network and separate fan fiction website. MuggleNet currently features over 200 pages of content plus an archive of over 18,000 articles, including news, editorials, recipes, a caption contest and more. Originally owned by founder Emerson Spartz, MuggleNet became an independently-owned and operated brand in early 2020 and, according to its Twitter bio, has been women-led since 2017.

Joseph Rudyard Kipling was an English novelist, short-story writer, poet, and journalist. He was born in British India, which inspired much of his work.

Avengers: Age of Ultron is a 2015 American superhero film based on the Marvel Comics superhero team the Avengers. Produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures, it is the sequel to The Avengers (2012) and the 11th film in the Marvel Cinematic Universe (MCU). Written and directed by Joss Whedon, the film features an ensemble cast including Robert Downey Jr., Chris Hemsworth, Mark Ruffalo, Chris Evans, Scarlett Johansson, Jeremy Renner, Don Cheadle, Aaron Taylor-Johnson, Elizabeth Olsen, Paul Bettany, Cobie Smulders, Anthony Mackie, Hayley Atwell, Idris Elba, Linda Cardellini, Stellan Skarsgård, James Spader, and Samuel L. Jackson. In the film, the Avengers fight Ultron (Spader)—an artificial intelligence created by Tony Stark (Downey) and Bruce Banner (Ruffalo) who plans to bring about world peace by causing human extinction.

Night Vale Presents, formerly known as Commonplace Books, is a production company and independent podcast network founded in 2015 by Joseph Fink and Jeffrey Cranor. In 2016 Night Vale Presents expanded into a network hosting original podcasts other than Welcome to Night Vale. Night Vale Presents is partnered with Public Radio Exchange.

The network started off with only fiction podcasts, but later expanded to include nonfiction and commentary podcasts as well. Notable podcasts in the network include Welcome to Night Vale, Alice Isn't Dead, and Sleep with Me.

Night Vale Presents' first non-fiction podcast, Conversations With People Who Hate Me, premiered on July 30, 2017. It is a weekly discussion-based podcast featuring Dylan Marron talking with people who have sent him hateful comments online, or mediating conversations between others who have had arguments online including celebrity guests.