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- The Big Finish Doctor Who audio plays have their own Canon Immigrants brought in from the comic strips, mostly from Doctor Who Magazine: short episodes feature cuddly alien conqueror Beep the Meep and Time Lord construct Shayde, and there is a short and a full-length episode in which the Doctor's companion is shapeshifting penguin Frobisher.
- The Company Of Friends is an Eighth Doctor play that features a 45-minute story for two people that were never in the Big Finish audios before — Fitz (books) and Izzy (comics).
- For the longest time, Big Finish's works were of debatable canon, never officially being acknowledged by the show itself, but never being denied either. In a prequel to the 50th anniversary special called "The Night of The Doctor", the Eighth Doctor acknowledges and name-drops all of his audio-only companions, officially rendering Big Finish's stories and characters canon.
- The Company Of Friends is an Eighth Doctor play that features a 45-minute story for two people that were never in the Big Finish audios before — Fitz (books) and Izzy (comics).
- Advice and Trust: Chihiro Tanaka, a character originally created in Once More with Feeling is Shinji, Asuka and Rei's classmate and makes several appearances where she tries to woo Shinji and pry him away from Asuka and Rei... with no success whatsoever.
- Once More with Feeling: Someone asked the author if Mana Kirishima would show up. He answered: "Who is Mana Kirishima?". After looking for information about her, he stated she would show up, but nobody better count on it being more than one scene or her role being big.
- Mechanic Wrench of the fic, Rainbow in the Dark, actually has her origins in an earlier piece by the author.
- The Awakening of a Magus (an early Harry Potter fic the author stopped writing and removed from Fanfiction.Net due to personal problems, although a copy still exists on fictionalley.org), had a Recursive Fic called Who Wants to Live Forever describing the death of a background character from over 3000 years ago (likewise removed due to being a songfic). Details of that description later made it into the Awakening.
- The original Pokéumans series was sufficiently successful and had enough scope to prompt a community of fan series of its own. Ideas from these such as the evil mooks being called 'Extinctionists' and The Board of Dream Messengers were then accepted across the whole group and in the original series.
- Reimagined Enterprise takes a number of plot details from the non-canon Star Trek Expanded Universe and uses them.
- In Mega Man: Defender of the Human Race, a story based around the Mega Man cartoon and Classic game series, the leader of the Mega Crew is revealed to be Tiesel Bonne, from the Mega Man Legends games. Later, his siblings appear, and the Bonnes become supporting characters.
- In Mega Man Reawakened, Big Name Fan Lizsama's Original Character, Elizabeth Marmalade, appears in Arc 3 with her permission.
- Neon Metathesis Evangelion mostly follows the anime series' continuity of Neon Genesis Evangelion. However, it also features Mana Kirishima from the non-canon video game Girlfriend of Steel.
- On DC: United We Stand, in addition to the pre-existing examples of Canon Immigrants from DC Comics, there are also quite a few characters available who either had not appeared as of the time the roleplay is set, are adaptation-exclusive characters, or are from the New 52 reboot.
- The Turnabout Storm novelization does this in regards to the Sirens from My Little Pony: Equestria Girls – Rainbow Rocks. Since the Sonata from Rainbow Rocks and the Sonata from Turnabout Storm share the same name, the Sirens get to be related in the following way: the mother of the Sonata in this story is Adagio, and her sister is Aria (who reminds Sonata of Maya).
- With This Ring: Mainstream DC Comics characters that didn't appear or mention in the original Young Justice show are: Yao Fei from the Great Ten; John Constantine and the recurring cast of Hellblazer; the casts of Knight and Squire including the eponymous duo, Captain Cornwall and Cornwall Boy, and Dark Druid; Arnold Munro from Young All-Stars; Swamp Thing and Abigail Arcane; Henry King, Jr. of Infinity, Inc.; Holly Robinson; and the Super Young Team. There are also a few cameos from the comic "The Sandman," including Delirium of the Endless and Lord Kilderkin, and OL's Evil Counterpart Nylor Truggs is originally from Dial H for Hero.
- The 'Zorro Farfetch'd' from the oneshot fanfic The Edit War for Ash's Freedom to not be Betrayed hopped on over to the author's ongoing Pokemon fanfic Pokémon Reset Bloodlines in Chapter 28.
- The Moorish character in Robin Hood, who in the last decade or so has cropped up in Film and TV, at least. The earliest incarnation seems to have been Nazir in Robin of Sherwood.
- The 1998 American Godzilla officially became part of the Japanese Godzilla franchise with the release of the film Godzilla Final Wars and was even given the official name of "Zilla". Poking fun at the American rendition, unlike all the other monsters, which are depicted as men in latex costumes, Zilla is rendered in intentionally mediocre CGI.
- He was referenced in an earlier film in which a character asks "Didn't Godzilla show up in New York recently?" and is told "That's what the Americans think."
- And it doesn't stop there. Mothra, Rodan, Varan, Baragon, Kamoebas (a giant turtle from the obscure film Space Amoeba), Moguera (from another obscure film called The Mysterians), Meganulon, Manda (from yet another obscure film called Atragon) and King Kong were all stars in their own respective films before becoming part of the Godzilla franchise.
- Frankenstein Conquers the World
- It's known as Frankenstein vs. Baragon in Japan. It takes Frankenstein's Monster (who, not surprisingly, is mistakenly called "Frankenstein") growing to giant size and fighting Baragon.
- Mosasaurus appears in Jurassic World, after playing a prominent role in Jurassic Park: The Game. The Masrani website also talks about the Bri-bri natives of Isla Nublar relocated to the mainland in The '80s, who were first represented in Jurassic Park: The Game in the character of Nima Cruz.
- Killer Tomatoes Eat France, the fourth and final Killer Tomatoes movie, features Zoltan and Ketchuck, two of Gangreen's tomato lackeys in the Attack of the Killer Tomatoes animated series. In addition, the film features a third tomato grunt named Viper, who is loosely based on the cartoon-exclusive tomato Fang.
- Black and White in Color: This film was originally titled La Victoire en chantant ("Victory sings") in France, from a line in a French martial song. Since that reference would be lost to international viewers the international release was titled Black and White in Color. Then, when the film was re-released in 1977 in France after winning the Oscar, it was titled Noirs et Blancs en couleur.
- King Toadstool and Wooster, Super Mario Bros.-related characters introduced in Nintendo Comics System, made a few appearances in the Nintendo Adventure Books.
- The Lone Wolf gamebook series had a short-running companion novel series called Legends of Lone Wolf, which covered and expanded upon the gamebook stories, including introducing several new characters. Demigoddess Alyss was introduced early into that series, and broke through the canon ceiling in Book 16 of the gamebook series.
- Older Than Radio: None of the three most famous stories associated with the Arabian Nights—"Aladdin","Ali Baba and the Forty Thieves", and "Sinbad the Sailor"—were part of the collection as it was assembled in the Arab world over several centuries. All three were independent folk stories added to the Nights by Antoine Galland when he compiled his 18th century French translation, which introduced the Nights to European culture.
- William Gillette's Sherlock Holmes play introduced the character of Billy the page-boy. When Arthur Conan Doyle later wrote a couple of Holmes plays himself (The Crown Diamond and an adaptation of The Speckled Band) he included this character, possibly for the sake of consistency with Gillette. Conan Doyle later adapted The Crown Diamond into a short story (The Mazarin Stone), and thus Billy entered into the Sherlock Holmes canon. He also received a very brief mention in a couple of the later canonical tales.
- Happened with Raymond E. Feist's The Riftwar Cycle. The characters of Gorath, Owyn, Jazhara and Jimmy's twin brother Lysle Rigger all make their first appearances in the computer games Betrayal at Krondor and Return to Krondor, set in Feist's world. They were then incorporated into canon when Feist wrote a novelization for both games and made references to them in later books.
- Margo Lane appeared first on The Shadow radio show before Walter Gibson incorporated her into the prose series. Earlier novels of the Shadow often only barely featured women, but the radio show wanted vocal contrast.
- Inspector Morse had a Canon Immigrant car. The original novels by Colin Dexter had Morse driving a nondescript modern vehicle, but the TV show gave him a Cool Car, a red 1960s Jaguar Mark II. The car became so iconic of the character that the novels written after the TV show started included it with no explanation of the change, even to the point of putting it on covers (art images, not photos from the show).
- Ellery Queen's secretary Nicky Porter was originally created for the radio show, but later appeared in two of the novels and a dozen short stories.
- Hastur, a Great Old One in the Cthulhu Mythos, is actually a canon immigrant from The King in Yellow (well, sort of) with a name taken from an Ambrose Bierce story by way of August Derleth. Lovecraft, Derleth and Robert E. Howard were all friends and frequently borrowed and swapped ideas for deities and monsters.
- A minor example: The Wizla Tobacco and Rolling Paper Company was first mentioned on the label of Albert's tobacco tin in the TV adaptation of Hogfather, before getting referenced several times in Unseen Academicals.
- As revealed in the official Mort playscript, rather than try and duplicate the established appearance of Rincewind for the sake of a brief cameo, the Studio Theatre Club replaced him with their own nervous junior wizard character. They called him Stibbons.
- In The Compleat Ankh-Morpork City Guide the list of cafés includes Café Ankh, and the pubs and taverns includes the Octarine Parrot, both from Discworld Noir.
- Doris and Benny the Cab, created for the film Who Framed Roger Rabbit, appeared in the sequel to the original book. Another character created for the film, Teddy Valiant, is mentioned in the book, though he doesn't appear in either version because he was killed years ago.
- Two famous British literary heroes had their backgrounds tweaked to reflect those of their actors in live action adaptations:
- At first, Ian Fleming didn't like the casting of Sean Connery as James Bond. However, after seeing Dr. No, he made Bond's father, like Connery, a Scot.
- Bernard Cornwell established his hero, Richard Sharpe, as born and raised in London. After Sean Bean portrayed the character for television, Cornwell added a previously unrevealed aspect of Sharpe's childhood. At age 15, Sharpe moved to Yorkshire, where he presumably gained an Oop North accent similar to the obviously-not-from-London Bean's.
- Also the character of Rifleman Harris was created for the TV series and subsequently appeared in the novels because Cornwell liked him.
- Havenite superspy Victor Cachat was first introduced by Eric Flint in a spin-off anthology Changer of Worls, in a short story which also made Anton Zilwicky an Ascended Extra. He had since became an iconic character and as much as a series' mascot as an eponymous protagonist herself. Though Flint in essence becoming Weber's equal partner in writing the series might have to do something with that.
Live Action TV
- The first name of Uhura, of Star Trek: The Original Series. The name "Nyota" (Swahili for "star") was invented by William Rotsler for his 1982 book Star Trek II Biographies. It was approved by the original actress, Nichelle Nichols, and by series creator Gene Roddenberry. After wide use in the Star Trek Expanded Universe and All There in the Manual works it finally became canon in the 2009 film, Star Trek. As did the names of Captain Kirk's parents, George and Winona, coined by novelist Vonda N. McIntyre in Enterprise: The First Adventure. McIntyre also gave Mr. Sulu the first name Hikaru in her novel The Entropy Effect, and the name was canonized in Star Trek VI: The Undiscovered Country.
- The Holodeck of the Star Trek: The Next Generation series, which started its life in Star Trek: The Animated Series. Kirk's middle name was first declared as "Tiberius" in the animated series as well (though it was conceived earlier, and Gene Roddenberry had previously used "Tiberius" as the middle name of the title character, William T. Rice, in his first TV series The Lieutenant).
- Although that does conflict with the tombstone that Gary Mitchell conjures up in the second pilot, which reads James R. Kirk...
- Add to that Lady Amanda's surname of Grayson, taken from "Yesteryear," the best known episode of ST:TAS.
- Minor example: the most prominent new species of the animated series, the Caitians (M'ress) and Edoans/Edosians (Arex), are also canon immigrants: Caitian admirals appear in The Voyage Home and Edosians have been mentioned several times (for instance, Garak dealt with Edosian orchids while a gardener).
- If plot points from originally non-canon works count, then the big, big one would be the entire episode "Yesteryear". Though the animated series was largely considered non-canon, this one episode gave us a lot about Vulcan culture and Spock's past that has been adhered to - its events were referenced in TNG's "Unification," Vulcan's Forge and sehlats were featured in the Vulcan trilogy on Star Trek: Enterprise, and the reboot movie's sequence with young Spock is taken nearly word-for-word from the episode.
- While only referred to as a "teddy bear", the sehlat was actually first described in the episode Journey To Babel, so it may not qualify.
- Synthehol, an alcohol substitute that gets one drunk, but the effects of intoxication can be dismissed at will, started life as a concept in the TNG novels and was soon written into the TV series.
- "The Warrior's Anthem", a Klingon war hymn sung in DS9: "Soldiers of the Empire", originally appeared in the video game Star Trek: Klingon.
- Doctor Who has occasionally dipped in its Expanded Universe, largely because of the former fanboys currently in charge.
- The television episodes "Human Nature"/"The Family of Blood" had their basis in the Doctor Who New Adventures novel Human Nature by Paul Cornell, who also wrote the adaptation.
- Gareth Roberts used the central concept of his Doctor Who Magazine story "The Lodger" (the Doctor becoming an ordinary Earthling's lodger) as the basis for the TV story "The Lodger".
- As far as actual characters go, the Dalek Emperor first appeared in Dalek comics and annuals, though he looked considerably different in his first TV appearance in "The Evil of the Daleks". When he re-appeared in "Remembrance of the Daleks" he looked more similar to the comics version, as a Shout-Out.
- The idea of top-ranking Daleks being gold-painted began in the Peter Cushing films, but made its way into the first couple of colour TV Dalek stories. Speaking of the Cushing films, the new Daleks props introduced in "Victory of the Daleks" take their technicolor design from those of the movies and a couple of design elements (most notably the balljoints for the eyestalks.) from the same comics the Dalek Emperor first appeared. The smallest Dalek time unit, the "rel", also began in films and comics but has been incorporated into TV canon in post-2005 Dalek stories.
- The look of the Daleks' flying saucers, which first appeared on the DVD release of "The Dalek Invasion of Earth" as replacement special effects, and later appeared in the series itself, was originally from the comic strips.
- A glass Dalek was first mentioned in David Whitaker's novelisation of the original Dalek story: Doctor Who in an Exciting Adventure with the Daleks. A glass Dalek eventually made it into TV canon in "Revelation of the Daleks".
- The episode "The Power of Three" brought Kate Stewart, the daughter of the Brig, into the series.
- While not appearing in the episode, the Chelonians, an alien species first introduced in the Doctor Who New Adventures novels during the show's nineties hiatus, are name-checked as part of the Legion of Doom of "The Pandorica Opens".
- "The Night of the Doctor" makes canon several Eighth Doctor companions from the Big Finish productions: Charley, C'rizz, Lucie, Tamsin, and Molly.
- In "The Day of the Doctor", the Eleventh Doctor meets a character called the Curator, strongly implied to be a far-future regeneration of the Doctor, played by an elderly Tom Baker (who played the Fourth Doctor in the 1970s). The character originates from the odd pseudo-Framing Device used in the official reconstructions of Development Hell serial "Shada", which were narrated by an old Tom Baker, dressed in a suit and describing the missing scenes while showing the viewer around an art gallery. He also referred to the Doctor in the third person, but prominently used the Fourth Doctor's mannerisms and Character Tics, and performed the unfilmed Script Wank scene where the Doctor announced that maybe someday he'd retire and everyone would think that he was just a nice old man with the Fourth Doctor's signature Cheshire Cat Grin.
- A number of concepts from the spoof Doctor Who: The Curse of Fatal Death eventually found their way onto Moffat-helmed canon, such as Time Lords being able to change genders upon regeneration, the Master romancing the Doctor, and why are there chairs on Skaro.
- Abslom Daak, a '90s Anti-Hero character from the Doctor Who Magazine comics, was briefly alluded to in "Time Heist".
- In a comic about the character Spike from Angel, Spike is sent to an asylum for demons and meets an incredibly strange character... a human-sized, floating, telepathic Betta fish named Betta George. Apparently, when Joss Whedon approached the writer of these comics to collaborate on the canon continuation comic After The Fall, he noted "I like George. Let's find a place for him." The fans are reportedly somewhat squeamish about the inclusion of such a blatantly strange character in canon, despite the show's other eccentricities.
- Illyria also appeared in another comic's canon and appears in Buffy season 9.
- Beck, who also appeared in the Asylum mini-series and other Spike comics, appears in After The Fall.
- Howard, Marina, and Pearl from Last of the Summer Wine. They started out in a stage play version of the show, and got a good enough reaction to become part of the TV cast.
- The CSI villain Sqweegel. Anthony Zuiker's digital novel "Level 26 Dark Origins" has first White Sqweegel and at the end comes Black Sqweegel, the one who crossed to CSI. Word of God has confirmed the immigration on Level 26 website.
- In Power Rangers, this is subverted with Zordon's home planet of Eltar. While Eltar Is first mentioned in the non-serial first movie, and not mentioned in the main canon until Power Rangers Turbo, the name has been in the Universe Bible since the beginning.
- Likewise the Tengu (renamed Tengas) and the Rangers' ninja costumes and powers originated in the movie and were used in Mighty Morphin' Power Rangers Season 3, since the events of the movie were modified and retold in the series. The Zords don't quite count as they were based on the mecha from Ninja Sentai Kakuranger and most likely would have appeared in the series anyways even if the movie was not made.
- The Battlizer from Power Rangers S.P.D. crossed over to its source material, Tokusou Sentai Dekaranger, the same yearnote when they returned for its team-up movie with Magiranger.
- While the term wasn't used for Gokai Silver's Gold mode from Kaizoku Sentai Gokaiger and Kyoryu Red's Carnival mode from Zyuden Sentai Kyoryuger, both modes do share traits from Power Rangers Battlizers, most notably, enhanced power armor, and a finisher.
- The New Powers from Power Rangers Super Megaforce certainly count. These are Dairanger, Changeman, Flashman, Fiveman, and Maskman, five previously unadapted Super Sentai teams, thus were previously part of Sentai canon, but not Power Rangers canon.
- The "Clue Crew" in Jeopardy! originated on the short-lived kids' version Jep!, there called the "Jep! Squad".
- A variant: Supergirl and The Flash (2014) will have a musical Crossover featuring a version of The Music Meister, who originally premiered in Batman: The Brave and the Bold. He may or may not ever make it into the comics, however, since his gimmick doesn't exactly work in a silent medium.
- The Meister made a few appearances in Supergirl prior to this as well.
- The Beatles had a problem with the soundtrack to their television film Magical Mystery Tour, as the film had only six songs. In Britain the soundtrack "album" was released as two singles with three songs apiece. In America, Capitol Records added the Beatles' 1967 singles (including "Penny Lane", "Strawberry Fields Forever", and "All You Need Is Love") to the soundtrack to make a full length album. The revised American version has now become the standard version all around the world; the original British edition of Magical Mystery Tour wasn't released again until the 2012 DVD and Blu-ray special edition rerelease of the movie. Purists don't like the US album because it apparently messes with the band's concept - but the band actually preferred the US album and reissued it as such from the 70s onwards.
- Bryan Ferry's "Let's Stick Together" compilation was created for the US market, as the label demanded an album off the back of his "Let's Stick Together" single and declined to release his "The Price Of Love" EP. He combined the two releases with the previous year's "You Go To My Head" single, some UK B-Side recordings of Roxy Music tracks and a then unreleased version of "Casanova", in order to create an 11 track album. Whilst initially intended as a US only release, "Let's Stick Together" became hugely popular on import to the point where Island released it in the UK, and it has featured in all the reissue series since. Part of the reason is that it was the first Ferry release after Roxy Music announced their split.
- Megadeth's soundtrack contribution compilation Hidden Treasures was originally designed as a limited edition bonus disc for Youthanasia, but became very popular, largely thanks to the hit single "Angry Again" being included. It was released as a separate release in its own right, and a remastered version was reissued in the UK many years later (the US label kept most of the tracks for the box set Warchest, although some appear in different versions).
- Oasis had the B-Side compilation "The Masterplan" which was designed for US and Japanese fans to avoid them paying a lot of money for singles. It ended up being released in the UK thanks to demand, and has since become one of their most popular releases.
- The Human League pretty much adopted Phil Oakey & Giorgio Moroder's "Together In Electric Dreams" as their own, including it on Greatest Hits compilations and performing it live for many years. The track was originally Moroder's and he hired Oakey to sing on it for the Electric Dreams soundtrack. To Oakey's surprise, it was a bigger hit than the Hysteria album his group was promoting at the time, thus necessitating its inclusion in their canon.
- Although many sources now list among the Norse pantheon a goddess of love named "Astrild", she is in fact the creation of a Romantic-era English poet; the original Norse goddess of love was Freyja.
- The hippogriff made its first documented appearance in the 16th century poem Orlando Furioso, and it's unlikely that even people who'd sincerely believed in griffins ever gave credence to these horse/griffin hybrids (griffin were supposed to eat horses, not..). That hasn't stopped modern fantasy writers from including them in the roster of commonly-appearing mythical beasts.
- Rudolph The Red-Nosed Reindeer, created for a department store giveaway childrens' book which was later adapted into a song and a TV special. The character became so popular that he's been added to the eight reindeer from "A Visit From St. Nicholas"/"'Twas The Night Before Christmas" and has become The Face Of The Band in the public consciousness.
- Similar to Clark and Lois' marriage, Jon and Liz of the comic strip Garfield are now the strip's Official Couple after nearly 30 years of non-interest and pity dates on her part. This is mainly because the live action movies had paired the two off in the first and married them in the second.
- Also, Binky the Clown who debuted in Garfield's Halloween Adventure/Garfield in Disguise before appearing in the strip a year later.
- Floyd the mouse is an odd case. He debuted as a minor character on Garfield and Friends, and appeared in the strip several years after that show ended, but he only ever appeared in one strip (January 27, 1998◊). The presence of an infrequently appearing mouse character named Squeak probably played a role here.
- Hubert and Reba, Jon's old neighbors. They first appeared in the special Here Comes Garfield, aired October 25, 1982, then started to appear in the strip 13 days after that.
- The animated Peanuts special, Snoopy's Reunion, aired in 1991, featured three of Snoopy's siblings who hadn't appeared in the strip, Andy, Molly, and Rover. While Molly and Rover never appeared in the strip, Andy first appeared in the strip in 1994.
- Cueball, the villain from the 1946 film Dick Tracy vs. Cueball, would much later (2011) appear in the Dick Tracy comic strip. The main villain from "Dick Tracy vs Gruesome" (1947) would follow suit in 2014. The character's resemblance to Boris Karloff (who played Gruesome in the movie) was played up by having him appear in a production of "Arsenic and Old Lace" and encountering the real Boris Karloff's daughter, Sara, at a horror convention.
- The comic book version of Nancy from 1959-63 had a character named Oona Goosepimple, a Cute Ghost Girl who lived in a haunted house. She didn't appear in the newspaper strip until 2013, 50 years after her last appearance.
- Tank Mc Namara: Tank's neighbors, Nick and Kate, were the stars of their own strip, Second Chances, from 1996 to 2000. When the strip ended, they were folded into the Tank cast.
- The main character of the '70s manga and anime Tiger Mask, a masked pro wrestler by the same name, was brought into New Japan Pro Wrestling in the '80s. He's since become something of a Legacy Character — at least four different wrestlers have donned the mask — as has his Evil Counterpart, Black Tiger.
- Suicide, a character who first appeared in TNA Impact!: The Video Game, and later showed up in the ring to exact unspecified revenge on the Motor City Machine Guns. Due to wrestling's self-aware nature, this led the Guns to complain to anybody who'd listen about having been beaten up by a video game character.
- Tommy Lister, a.k.a. "Zeus", became a pro WWF wrestler after doing No Holds Barred with Hulk Hogan. That venture fared mediocrely, but that didn't stop WCW from bringing him back briefly to fight Hogan as "Z-Gangsta".
- WCW tried it too, when they made David Arquette the WCW Champion after Ready to Rumble. This isn't quite an example, as Arquette's WCW run was explicitly as himself and not his character from the movie, but it's close enough to merit a mention. The bizarre triple-cage match that serves as the movie's climax also made a WCW appearance as part of this storyline.
- Adam Steiner was created for the spin-off cartoon; however, he has since been "adopted" into the canon of the main line, becoming one of the heroes of the Lyran Alliance due to his military exploits and eventually becoming known as one of the greatest Archons in the history of the Lyran state. Other characters from the Cartoon have appeared, but none as prominently.
- Ian Dresari, the protagonist of MechWarrior 4, is canonized in the history of the tabletop game. Word of God is that reports of Ian Dresari's tyranny in the sequel are actually unfounded propaganda by House Steiner to demonize him and turn public opinion from him. Dresari was defeated but ultimately survived the events of Black Knight come the time of the Civil War.
- The Bombast Laser in Mechwarrior 4: Vengeance was made a canonical weapon eight years later in the "Tactical Operations" advanced rulebook. The Deimos battlemech originally appeared as an unofficial mech in the MekPak Game Mod for the Mercenaries Expansion Pack. It was later made canon and appeared in the official BattleTech technical readouts
- The various spinoffs often redesign mechs for the sake of aesthetics, some of which make it back into the artwork of the boardgame and the other spinoffs, especially for mechs that haven't had a redesign since 1984 and the days of boxy black-and-white mechs with funny proportions. For example, the trading card game redesigned the awkward looking 'Black Lanner', which later reappeared 9 years later in Mechwarrior Living Legends
- The Blood Ravens chapter of Space Marines in Warhammer 40,000 were initially invented for the Dawn of War series of video games, but eventually got accepted into 40K canon due to the popularity of the series, and have since appeared in several Black Library novels, including the novelisation of the games themselves.
- Another was the use of Thunder Hammers without the use of Terminator Armor.
- Plus being used as an example of how to use Chapter Traits in the old 4th edition Codex (albeit with traits that were not at all representative of the Blood Ravens as seen in-game despite more fitting ones being available, making for a weirdly inverted case of Canon Defilement).
- The Blood Ravens have also become a one-spin-off-to-another example with the release of the Honour The Chapter sourcebook for Deathwatch. Prior to this there was just one piece of art in Rites of Battle and a quote from Captain Davian Thule in the core book.
- Another example is the Blood Angels' special character Mephiston, Lord of Death. According to his backstory he used to be Brother Calistarius, the Librarian from the spinoff board game Space Hulk.
- Elegant Nova of Progression first showed up in Keychain of Creation as an Alchemical Mad Scientist dedicated to making mortals into Alchemical Exalted piece-by-piece. Now, crack open Manual of Exalted Power: Alchemicals and flip through to "Notable Individuals"...
- The Viashino of Magic: The Gathering were originally introduced in the Tie-In Novel The Prodigal Sorcerer by Mark Sumner. The designers of the game liked them so much that they worked them into the game, and they still turn up from time to time.
- Gomorra, California, home of the tie-in Collectible Card Game, would eventually become an Immigrant Setting for Deadlands. Part and parcel to this were many, many Canon Immigrants, including most of the entire Whateley Family, Sioux Union, and piratical Maze Rats.
- Many concepts devised for specialized settings in Dungeons & Dragons have subsequently become incorporated into the core rule system, as when domains and darklords from the 2nd edition Ravenloft setting became a standard feature of the 4th edition Shadowfell.
- The writers of the Forgotten Realms supplements have made canon a wide variety of plot points from the video games. The whole Bhaalspawn plot from the Baldur's Gate series is referenced in the 3.5E splat Lost Empires of Faerûn. Zehir of Neverwinter Nights 2: Storm of Zehir and the yuan-ti god of poison, was homebrewed for that Expansion Pack, then became one of the primary pantheon of 4th edition and its Nentir Vale setting, and then was relisted as a subservient deity of Bane in the 4E Forgotten Realms Campaign Guide.
- Psurlons were a new monster created for the Dark Sun: Shattered Lands computer game. They turned out to be popular and interesting enough to be introduced to the tabletop setting as well.
- After a PC game was made out of Jeff Wayne's Musical Version of The War of the Worlds, he utilised several features from it for the live stage version (most notably a large part of the Martian intro movie, and the game's model for the Martian flying machine which can be seen briefly during The Red Weed)
- The Starlight Girls (the foster girls Jerrica takes care of) were created specifically for the Jem TV series. However, at least three of them: Ashley, Ba Nee, and Krissie, were later made into dolls.
- Many of the more notable minor characters in My Little Pony Friendship Is Magic began gaining more and more recognition and nods from the writers, to the point where several of them were finally firmly cemented into canon in the form of toys. By now, the overwhelming majority of background ponies have toys; previous generations have had toylines that were much bigger than the shows' casts, but Hasbro realized how much fans have latched onto the background characters and have figured that if they make the "extra" toys look like the crowd filler ponies instead of just slapping random color schemes on them, you'll have a character who means something to someone. The Fan Nicknames are even used when not problematic due to copyright.
- The Baroness actually debuted in Marvel Comics' G.I. Joe in issue #1, created by Larry Hama when he realized there were very few women in G.I. Joe at the time. She was the first character in the canon to cross media, being imported into the TV show and given her own figure thereafter.
- Monster High's C.A. Cupid is this for Ever After High, where she currently resides.
- Something*Positive's creator sometimes posts comics supposedly based on his real life, formerly under the name Rhymes With Witch. One of them included a bizarre creature that looks like a blue stuffed animal, which switched from being super-happy to psychotic in seconds. The Alt Text quipped that he would be added to the comic unless the fans sent in money. Apparently they didn't—he's been Kharisma's ambiguously Imaginary Friend for years now (and has received the name "Fluffmodeous").
- Going the other way, Rippy the Razor was a one-off gag in Something*Positive (as a mascot that Davan apparently drew), but now is Randy's (living) tormentor in some RWW material.
- The Dini-verse characters Kathy Duquesne, Roxanne Ballentine, and Sonia Alcana from the DC Animated Batwoman movie are regular characters on DC Nation, having been recruited by Hawkman to police his town between incarnations.
- Somewhere askance of canonical Problem Sleuth, the Midnight Crew, a four-man mercenary group, was created as a donation request that spent most of their time fighting the protagonists. In Homestuck they are exiles in the Trolls' session, and were given about a month of screentime and character development. Later, in the Kids' session, they are given new names, and the leader ascends to Big Bad status.
- In another Homestuck example, when Andrew Hussie put the Homestuck adventure game up on Kickstarter, he promised humorous rewards for extremely high donations, including "Your fantroll will become canon" for a donation of $10,000. He was incredibly surprised when not one but two people actually donated that amount. True to his word, those trolls (Mierfa Durgas and Nektan Whelan) did show up in the comic's canon... but the $100,000 prize was "Your fantroll will survive past their first panel", so they didn't last long.
- Season 4 of Survivor: Fan Characters pitted ten canon characters, such as Sephiroth, Riku, Shiki, and Minerva Mink against ten fan-made characters. In other seasons, characters from the fan-characters canon universes visit on the family and friend reward challenge, and the host of all 8 seasons so far has been Jeff Probst.
- Dragon Ball Multiverse: Even though the authors are not fans of Dragon Ball GT, U18 Bra is clearly the non-fighting, typical teenager GT incarnation. She even wears the same outfit. Word on this is that one of the authors liked her character even though she's from in their minds a bad series.
- As seen above, Friendship Is Magic 07-P4 has Sunset Shimmer make a brief cameo to help the group see the jewel on the monster they were fighting. The fact that she enters a portal afterwards heavily hints at the fact that this indeed is the Sunset Shimmer of the EqG-verse.
- Yelizaveta 'Bounce' from Survival of the Fittest version four started off as a character in the 'In-Universe Chat' (a chatroom where SOTF members could RP being members of the show's audience). After some time, she was brought into the version four pregame as a fully-fledged character.
- Lastie's PRIMARCHS has Farseer Kyli, a character who was originally created to MST the story. Lastie featured her in the story's 3rd arc.
- Barry Kramer, originally the editor for JonTron, has officially transferred over full-time to Game Grumps, which no longer includes Jon.
- An odd example with Critical Role: Sprigg was based on a character Darin De Paul played in a D&D game thirty-seven years ago with Matthew Mercer's mother - so, naturally, Darin plays him thirty-seven years later.
- The Animated Adaptation of Anne of Green Gables features the characters of Felicity, Felix, & Hetty King as well as suspected witch Peg Bowen, all of whom originally appeared in the live-action series Road to Avonlea (known just as "Avonlea" when it aired in the US on Disney Channel). Though Sullivan Productions created both shows, so they're only reusing characters they created.
- The antagonists from both live action Ben 10 films have appeared in Ben 10: Ultimate Alien. In that sense, Nanomech is one too.
- Matilda and Sergeant Slipper were created for the animated adaptation of Dennis the Menace (UK). They both made appearances later in The Beano.
- On The Fairly OddParents!, two of the Crimson Chin's villains, the Iron Lung and the Brass Knuckles, appeared in the non-canon webtoons before appearing in the series proper.
- Though The Goliath Chronicles has been excised from Gargoyles canon, with the exception of season premiere "The Journey", another part of the series has managed to find its way into fanon and eventually canon: The scene where Hudson's blind Human friend Robbins reveals that he already figured out Hudson was a Gargoyle, particularly the part where he mentions a scent "like old leather and concrete".
- While the comic licensed by Marvel was deemed noncanon, Petros Xanatos appeared in #7 prior to his onscreen appearance in Vows.
- Disney's Max Goof was imported into the Disney canon from Goof Troop. This is unique in that Max has no "iconic" depiction to revert to and, unlike other characters, has aged appreciably over time. However, Max's appearance and role is arguably based on Goofy Jr., a character used in Goofy's original cartoon shorts; this is somewhat confirmed by one episode in which he introduces himself as "Goofy Jr., ma'am."
- King Louie of Disney's The Jungle Book has appeared in a few other works based on the stories that the Disney film is based on, most notably Fables, which, as an afterthought, the creator Bill Willingham described as, "a very good example on why it's best to go back to the source material before one embarks on a major story, rather than rely on often faulty memory of which characters were original canon and which weren't."
- With regards to the Disney Animated Canon, in the United Kingdom and Sweden, The Wild is listed as the 46th entry (despite the fact that Disney merely distributed it), with Dinosaur being excluded. Interestingly, Dinosaur is a Canon Immigrant itself, as it was made as a separate project and wasn't considered Disney's 39th animated feature until several years after its release.
- Lola Bunny. Created for Space Jam, she became a regular in Baby Looney Tunes, the comic series, and most recently The Looney Tunes Show.
- Before Lola, there was Honey Bunny, Bugs's girlfriend in the comics, who made a cameo appearance in the TV special "Bugs Bunny's Thanksgiving Diet".
- Disney doesn't treat direct-to-video sequels as canon. The Lion King II: Simba's Pride is about Simba's daughter Kiara. Kiara has been accepted by most of the fandom; however, it wasn't until The Lion Guard that she reappeared in a media.
- In The Grim Adventures of Billy and Mandy, General Skarr from sister series Evil Con Carne has made it into the show.
- The character of Brutus from Popeye is an odd twist on the trope. The original Thimble Theater Newspaper Comics used the character Bluto first. After a two week fight with Popeye in the comics, Fleischer Studios thought he would be a good character to include in their theatrical cartoon shorts. Thinking (mistakenly) that Bluto was a creation of Fleischer Studios, Segar's successors created a Captain Ersatz of Segar's own character, named Brutus. Later in the Hanna-Barbara cartoons, Bluto was replaced with Brutus, the canon immigrant from the comics, who looked identical but had a different name, thus confusing children everywhere.
- As pointed out on its main page, The Hex Girls from Scooby-Doo! and the Witch's Ghost could technically count, since they debuted in that movie, and have since gone on to appear in another movie, an episode of What's New, Scooby-Doo? and 2 episodes of Scooby-Doo! Mystery Incorporated.
- Arguably Disney's best example; while Donald and Daisy Duck premiered in Disney animated shorts, one of Duckburg's most illustrious citizens, Scrooge McDuck, started as a supporting character in the Carl Barks' Donald Duck comics in 1947, where he grew in popularity until he wound up getting his own title in the fifties. His first animated appearance was in an educational short called "Scrooge McDuck and Money" in 1967, and then he starred in the 1983 theatrical featurette Mickey's Christmas Carol, as Ebenezer Scrooge. He then co-starred with Goofy in "Sport Goofy in Soccermania" before starring in DuckTales, cementing his place as one of the most famous cartoon ducks of all time.
- Meanwhile, Donald's nephews, Huey, Dewey, and Louie, first showed up in the Silly Symphonies comic strip (in which Donald starred at the time). Their first appearance was later adapted into an animated short, and the rest is history.
- Donald himself originally debuted in an unrelated, standalone Silly Symphony short, before being transplanted into the classic cast.
- According to Matt Groening, Milhouse Van Houten made his first appearance in a The Simpsons Butterfinger commercial.
- German exchange student Uter Zorker also debuted in the non-canon episode Treehouse of Horror IV. However, he didn't prove popular with viewers and was removed from the show one season later in The PTA Disbands!.
- A few elements of the 4Kids Teenage Mutant Ninja Turtles have made their way into the original comic book universe, including the Battle Nexus, and its proctor, the Gyoji; and more recently, Hun and (off-panel only, due to the series' cancellation) Agent Bishop.
- In the Tom and Jerry cartoons, the grey mouse who could speak came from the licensed comics. There, he was called Tuffy, and was Jerry's friend; when he was adapted, he became Nibbles, and Jerry's nephew.
- The character Oil Slick was originally a toy-only character in the Transformers Animated series. However, the writers found the idea of a chemical warfare expert who turned into a motorbike with a ram's head on the front (and a ninja, to boot) rather appealing, and he was later written into both the supplementary comic series and the show itself as part of Team Chaar.
- The Lockdown figure from the Transformers: Revenge of the Fallen toyline was later repurposed as G1 Lockdown. Although they're completely separate characters, their toys are identical and with only small differences in canonical appearances.
- And now, Lockdown appears in Age of Extinction! He looks quite different from the RotF toy, though. (And yes, TF toys usually come before the movie/cartoon/comic they're designed for, but Lockdown's toy came out when AoE couldn't possibly have been planned, years ago; it was more like "Everybody loved that Lockdown guy, let's movie-ify him and see if they'll buy his toy twice!"
- Woody Woodpecker has two: His niece and nephew Knothead and Splinter originally appeared in the comics, but were eventually brought over into his theatrical toons.
- The former law enforcer-turned-criminal Gorvan was an original character created for a videogame adaptation of Ben 10: Alien Force. Said character finally made its first canon appearance in Ben 10: Omniverse and it was implied that his backstory still involved betraying the Plumbers.
- The Adventure Time:
- Flame Prince first appeared in the Fionna and Cake comics before showing up in "The Prince Who Wanted Everything".
- "Orb" features Nightmare Princess, a character from the Adventure Time: The Secret of the Nameless Kingdom game (albeit in a form based off her Final Boss fight sprite rather than her normal appearance).