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Anime and Manga
- In Pokémon Ranger and the Temple of the Sea movie, Manaphy gets more fanfics since the end of the movie.
- The adventures of Ryouga Hibiki, he might be an important recurring character, but he also has an ability to cross oceans and dimensions as easily as walking through a doornote and more than once makes reference to his own adventures that don't revolve solely around Ranma. Where does he go, and who does he meet, what wacky adventures does he have on his own. Only fanfic writers know for sure. All we know is he often wears Leather Pants during them.
- At the end of the Kyoto Arc of Rurouni Kenshin, the popular Dragon Soujiro Seta decides to wander around Japan for ten years, much like the title character. Many fics have centered around his adventures during this time.
- Ever since the end of HeartCatch Pretty Cure!, several fanworks showcasing Futaba Hanasaki as a Pretty Cure (usually a pink one like Tsubomi/Cure Blossom and Kaoruko/Cure Flower) have popped up.
- In Doraemon - Nobita's Mermaid Legend movie, Princess/Queen Sophia gets more love with Ariel fans from The Little Mermaid (by Western Standards, at least.).
- The children (Albus, James and Lily II, Scorpius, et al.) who appear in the epilogue to Harry Potter and the Deathly Hallows, because while Harry's time at Hogwarts is over, it's a whole new adventure for the kids.
- Not to mention the adventures of Harry's parents' generation, which has been a staple of fanfiction since Harry Potter and the Prisoner of Azkaban established the broad strokes of their Back Story.
- Any of the books (or, for the more ambitious, the whole series) retold from the perspective of a character other than Harry. Some of the more common choices:
- Harry Potter and the Chamber of Secrets from Ginny's point of view - Arabella's The Very Secret Diary is one of the oldest and easily the most famous take on this plot, but fan writers are still coming out with new versions today.
- Harry Potter and the Chamber of Secrets from Luna's point of view - Basically, an origin story for her, since it's before her first appearance in canon, but we retroactively know it would be her first year at Hogwarts.
- Harry Potter and the Prisoner of Azkaban from Lupin's point of view
- Harry Potter and the Deathly Hallows from Neville's point of view - Dumbledore's Army and the Year of Darkness follows this, of course.
- Bill Weasley. It's mentioned that he is more-or-less an Adventurer Archaeologist, but this is never actually shown.
- The Hogwarts founders. These fics are mostly a vehicle for demonstrating that fanfic writers have absolutely no concept of how different life in 1000 A.D. was.
- Characters who are little more than named, providing perfect Self-Insert material, especially among the Slytherins. Aside from Blaise Zabini, we have Astoria Greengrass. Name known only by Word of God, she's Draco's future wife. Cue Possession Sues.
Live Action TV
- Doctor Who has been doing this a lot since the 2005 revival. Jenny from "The Doctor's Daughter", and Lady Christina de Souza in "Planet of the Dead" (last seen flying off into the night in a flying London bus) are perfect examples.
- Not to mention Meta-Crisis 10th Doctor, who, depending on if you count the deleted scene (it's up in the air as to if its canon) will have a TARDIS soon and has Rose with him.
- Also Sally Sparrow from Doctor-Lite episode "Blink", and now even Amelia Pond (the 7-year-old version of Eleventh Doctor companion Amy Pond, who doesn't actually travel with him until age 21). This last is possibly because the BBC created a genuinely believable companion character, but then could never get away with having a 7yo girl running off in the TARDIS in the dead of night without even so much as a goodbye note to her aunt Sharon. So the fans wrote the stories instead.
- Madame Vastra and her Ninja Maid Jenny from "A Good Man Goes to War". From the day the episode aired there has been an active Facebook group petitioning for them to have their own spin-off show.
- While River Song isn't a one-shot character, her appearances are far enough apart to feed fanfic writers to fill in the blanks. An especially popular idea (which is also more than a little frustrating since it hasn't happened on screen yet) is to imagine what it would be like if River ever crossed paths with Captain Jack.
- In The Sarah Jane Adventures episode Death of the Doctor, Sarah Jane mentions that she's been looking up other companions online. She mentions Ben and Polly are running an orphanage, Ace is running a charity, etc. Fans assumed that, "running a charity" or "running an orphanage" are like Sarah Jane's title of "Freelance Journalist," a small part of what they do, and possibly a cover for other things. That scene was ripe for a blossoming of SJA-like fanfic spinoffs, with every single companion up for grabs. (Also, the one-time return of Jo Grant and her grandson is a more direct example.)
- "What if the Doctor didn't depose Harriet Jones?" is just begging to be written, since that decision had profound consequences on the entire direction of the show. Especially since the Doctor noted that had she remained in power, Britain would have entered a modern Golden Age.
- Ashildr, who only shows up a few times in a single season, canonically lives from the 9th century until the end of the universe. And even then, she flies off through time and space with a quasi-immortal Clara Oswald. The possibilities are limitless.
- Captain Kirk's nephew Peter Kirk, who appeared in an original series episode but then was never even reffed again outside the Expanded Universe, is easily used by fic writers. Usually, he seems to join Starfleet, and rarely does he have anything even remotely approaching the career of his famous uncle. But he could be a farmer, a Locarno/Paris-type, an S31 agent, or the builder of the later Enterprises, because he has no canonical fate beyond being sent to Earth to live with his grandmother in Iowa, and that came from unshot scenes.
- Vash, the Adventurer Archaeologist on Star Trek: The Next Generation, eventually became a major character in the Millennium novels.
- Mini-Jack, the clone of Jack O'Neill who appeared in one episide of Stargate SG-1 and was never mentioned again. Here's an example where he goes to live with Cousin Mac in LA: http://wolfpupsden.skeeter63.org/fanfiction1/achristmastobelong.html
- iCarly featured a one-episode, badass, smoking hot Gamer Chick named Sasha Striker. She's kinda like Lilah from Ctrl+Alt+Del, shares some Foe Yay with Spencer, and finishes the show by giving him a big sexy kiss before leaving.
- Recent Power Rangers biggies include: The "Retro Rangers'" extended offscreen period of action, Conner's brother, previous teams After the End in the Power Rangers RPM universe, and any departing team to keep their powers.
- Hikari Sentai Maskman: X1 Mask, the Ranger who appeared only once.
- Irene Adler and her assistant Kate from Sherlock, who are very much a Gender Flip equivalent of Sherlock and John (only with the white-hot Ho Yay actually being acted upon.) Thanks to Irene's line about "liking detective stories, and detectives," it's not hard to assume she wriggled her way into Scotland Yard on a freelance basis the same way Sherlock did.
- The Hero Factory Recon Team was specifically set up by LEGO as a place where fans can insert their own Hero into the Hero Factory 'verse. (And where LEGO can sell custom action figures of said fanfic Heroes, natch.)
- Red vs. Blue: Pick a Freelancer agent. Any of them. Even the ones that technically haven't been named in the series yet - they're all named after states.
- Except Florida. Poor Florida.
- Turns out Florida is Captain Butch Flowers and his disappearance was covered up by the Counselor to protect the Alpha.
- Except Florida. Poor Florida.
- Anything related to Walt Disney has a countless number of fanfics and fanart, no exceptions, this leads to little kids and Disney fans imagining their own "Disney Adventures".
- For Avatar: The Last Airbender:
- Koh and the Spirit World is visited once and vaguely alluded to several other times in ways that seemed to foreshadow a return visit and... nothing. At the end of the series absolutely nothing came of any of it, making things perfectly open for fanfic writers to speculate like crazy on what all of that build up led to.
- In addition to this is the backstories of Iroh and Bumi, who are both old and have had major influences on the world. Bumi for being Aang's friend before he got frozen and Iroh for being a former General and having actually traveled to the Spirit World.
- There was an online game between Seasons 2 and 3 where comatose Aang revisited the Spirit World and had to fight Koh; the creators consider it canon, but it certainly doesn't satisfy as much as watching an episode on DVD would.
- Ursa gets a million fics explaining what happened to her, because we as viewers have absolutely no clue.
- Miraculous Ladybug centers around two Transformation Trinkets and their wielders' adventures. There are five others that are occasionally alluded to and mostly serve as Sailor Earth fodder.
- My Little Pony: Friendship Is Magic has the continuing adventures of Daring Do.
- Any "background pony" probably has a story or two written about them.
- TaleSpin has more than its share of interesting one-shot characters. Many of these have become popular with fan writers and artists, including Adventurer Archaeologists Myra ("In Search of Ancient Blunders") and Katie Dodd ("For Whom the Bell Klangs") and spunky Princess Lotta Lamour ("The Road to Macadamia").
- South Park: One-shot characters Damien, Gregory, The Mole, and Thomas are featured in a number of fanfics - but 99.9% of these are for shipping purposes only.
- Red X (as his own character, not Robin, who was X in his first appearance) appeared twice in Teen Titans, and is the show's Ensemble Darkhorse with many fanfics. It helps that he's an Anti-Hero / Anti-Villain whose identity is still a mystery.
- Robotgirl from Robotboy. She's only in two episodes, but gets a lot of fan art and YouTube videos.