| Work | Description | Characters |
|---|---|---|
| Journey to the West II | 1998 Hong Kong television series | 1 |
| Journey to the West: The Demons Strike Back | 2017 film by Tsui Hark | 1 |
| Judge for a Day | 1935 film by Dave Fleischer | 1 |
| Judges | seventh book of the Bible | 1 |
| Jujutsu Kaisen | Japanese manga series | 14 |
| Jujutsu Kaisen | Japanese anime television series | 13 |
| Jujutsu Kaisen 0 | Japanese manga series | 1 |
| Julian | 1964 novel by Gore Vidal | 1 |
| Jump Force | 2019 video game | 14 |
| Jupiter's Legacy | 2021 American superhero television series. | 1 |
| Jurassic Park | 1993 American science fiction adventure film directed by Steven Spielberg | 2 |
| Jurassic Park | novel by Michael Crichton | 2 |
| Jurassic Park III | 2001 US science fiction-adventure film directed by Joe Johnston | 1 |
| Jurassic World: Fallen Kingdom | 2018 5th Jurassic Park film directed by Juan Antonio Bayona | 1 |
| Justice League | US 2001-2004 animated television series | 8 |
| Justice League | 2017 American superhero film directed by Zack Snyder | 15 |
| Justice League: Action | Animated television series | 10 |
| Justice League: Crisis on Two Earths | 2010 film directed by Lauren Montgomery, Sam Liu | 5 |
| Justice League Dark | 2017 film by Jay Oliva | 3 |
| Justice League: Doom | 2012 film directed by Lauren Montgomery | 4 |
| Justice League: Gods and Monsters | 2015 film directed by Sam Liu | 2 |
| Justice League: Gods and Monsters Chronicles | 1 | |
| Justice League Heroes | 2006 video game | 2 |
| Justice League Task Force | 1995 video game | 1 |
| Justice League: The Flashpoint Paradox | 2011 animated film directed by Jay Oliva | 6 |
| Justice League: The New Frontier | 2008 animated superhero film by Dave Bullock | 5 |
| Justice League: Throne of Atlantis | 2015 film directed by Ethan Spaulding | 5 |
| Justice League Unlimited | American animated television series | 10 |
| Justice League vs. Teen Titans | 2016 animated film directed by Sam Liu | 5 |
| Justice League: War | 2014 animated film directed by Jay Oliva | 4 |
| Just So Stories | short story collection | 1 |
| Kabaneri of the Iron Fortress | Japanese anime television series | 2 |
| Kabaneri of the Iron Fortress | Japanese manga series | 2 |
| Kafka on the Shore | 2002 novel by Haruki Murakami | 1 |
| Kaguya-sama: Love is War | Japanese manga series | 5 |
| Kaguya-sama: Love is War | Japanese anime television series | 5 |
| Kaiji | Japanese manga series | 1 |
| Kaiju Big Battel | studio Kaiju performance | 1 |
| Kakegurui | 2018/2019 Japanese TV series | 1 |
| Kakegurui | Japanese anime television series | 3 |
| Kakegurui: Compulsive Gambler | Japanese manga and anime series | 3 |
| Kakushigoto | Japanese manga series | 1 |
| Kakushigoto | Japanese anime television series | 1 |
| Kamp Koral: SpongeBob's Under Years | SpongeBob SquarePants spin-off prequel series | 2 |
| Kanshikan Tsunemori Akane | Japanese manga series | 1 |
| Kebra Nagast | 14th-century text about the Solomonic dynasty in Ethiopia | 1 |
| Keep in Style | 1934 film by Dave Fleischer | 1 |
| Keep Your Hands Off Eizouken! | Japanese manga series | 1 |
| Keep Your Hands Off Eizouken! | Japanese anime television series | 1 |
| Keynote | 527th strip of the webcomic xkcd | 1 |
| Khan | comic series | 1 |
| Kiba | Japanese anime television series | 1 |
| Kiki's Delivery Service | 1989 anime film directed by Hayao Miyazaki | 2 |
| Kill Bill | Two films released in 2003 and 2004 directed by Quentin Tarantino. | 1 |
| Killing Eve | 2018 British drama television series | 2 |
| Killing Floor | novel by Lee Child | 1 |
| Killing Stalking | Korean manhwa | 2 |
| Killing time | novel by Della Van Hise, part of Star Trek: The Original Series | 4 |
| Kill la Kill | anime television series produced by Trigger | 9 |
| Kimi ni Todoke | Japanese manga series | 1 |
| Kimi ni Todoke | Japanese anime television series | 1 |
| Kimi no Kokoro wa Kagayaiteru kai? | 2015 single by Aqours, or the namesake song | 2 |
| Kim Possible | American animated television series | 1 |
| Kim Possible: A Sitch in Time | 2003 made-for-TV film by Steve Loter | 1 |
| Kim Possible Movie: So the Drama | 2005 Disney Channel Original Movie directed by Steve Loter | 1 |
| Kinect: Disneyland Adventures | 2011 open world video game taking place at Disneyland Park in California | 1 |
| Kingdom Hearts | 2002 video game | 10 |
| Kingdom Hearts | video game series | 8 |
| Kingdom Hearts 358/2 Days | 2009 video game | 1 |
| Kingdom Hearts 3D: Dream Drop Distance | video game | 3 |
| Kingdom Hearts Birth by Sleep | 2010 video game | 8 |
| Kingdom Hearts: Chain of Memories | 2004 video game | 5 |
| Kingdom Hearts Final Mix | 2002 video game | 1 |
| Kingdom Hearts II | 2005 video game | 16 |
| Kingdom Hearts II Final Mix | 2007 video game | 1 |
| Kingdom Hearts III | 2019 video game | 9 |
| Kingdom Hearts III Re Mind | DLC for KHIII game | 2 |
| Kingdom of Heaven | 2005 film directed by Ridley Scott | 2 |
| Kingdom of the Sun | cancelled film by Roger Allers | 1 |
| King Lear | play by William Shakespeare | 2 |
| King of Scars | 2019 novel by Leigh Bardugo | 2 |
| King of the Hill | animated television series | 8 |
| Kingsglaive: Final Fantasy XV | 2016 film by Takeshi Nozue | 1 |
| Knight Rider | 2008 TV series | 1 |
| Knight Rider | 2008 television film directed by Steve Shill | 1 |
| Knight Rider | 1982-1986 American television series | 1 |
| Knight Rider 2000 | 1991 television film directed by Alan J. Levi | 1 |
| Knives Out | 2019 American film directed by Rian Johnson | 1 |
| Knowing Me Knowing You with Alan Partridge | BBC Television series | 1 |
| Knowing Me Knowing You with Alan Partridge | BBC Radio 4 series | 1 |
| Knuckles the Echidna in Sonic the Hedgehog 2 | 1994 video game | 1 |
| Kobayashi Maru | Book by Michael A. Martin and Andy Mangels, from 2008 | 6 |
| Komi Can't Communicate | Japanese manga and anime series | 4 |
| Komi Can't Communicate | 2021 Japanese anime television series | 4 |
| K-On! | Japanese manga series | 1 |
| KonoSuba | Japanese light novel series | 1 |
| KonoSuba: God's Blessing on this Wonderful World! Legend of Crimson | film | 1 |
| Koro Sensei Quest | Japanese manga series | 1 |
| Kotoura-san | Japanese manga series | 1 |
| Kotoura-san | Japanese anime television series | 1 |