Sailor Earth / Live-Action TV

• 24 fans have it pretty simple: since there are so many CTU agents rotating in and out of the series through the show's run, simply have your CTU OC be on assignment somewhere else, which is why they're just meeting Jack Bauer or one of the others for the first time now. As the show has confirmed that there are other branches of CTU outside Los Angeles and had Jack working with the New York one in the eighth season, this isn't too much of a stretch.
• While this didn't really work during the show's run, the Buffy the Vampire Slayer finale created hundreds of Slayers around the world. As a bonus, Slayers are always teenage girls (except for those who manage to make it to their twenties), and as Most Fanfic Writers Are Girls...
  • Even before then, the show itself introduced a second "Chosen One" through Loophole Abuse in the second season (Buffy drowned but was revived by CPR; that brief death activated her successor early), and with Faith off the show's canvas from season 4 to season 7, there's three years of canon where she's easily killed off and replaced with an OC as required.
  • Angel firmly established that the Slayer being the sole warrior for humanity was a load of poppycock, with numerous individuals and organisations working against (and for) "vampires, demons and the forces of darkness", creating massive fanfiction potential. While most other demon hunters out there are simply Badass Normal humans, the Slayer isn't the only one with supernatural powers fighting on humanity's side. There's also good-aligned magic users, and a handful of demons and half-demons who side with humanity (since not all demon species are soulless sociopaths like vampires).
• Coming up with an OC for Captain Scarlet and the Mysterons is pretty easy — just pick a colour to give your captain. And since there are many colours, the possibilities are endless.
• With the introduction of a Magic School in Charmed Season 6 this opened up mountains of possibilities for fanfic writers to create teenage witches who fight demons. Using additional Elders, Avatars and other such beings is quite easy too since only a handful of them received names on the show. Also due to the show's Fantasy Kitchen Sink nature, plenty of fanfics introduce foes based on mythological creatures the show didn't use — a German "Season 9" fanfic used Avalon, the Gorgons and the djinn for example.
  • The canonical inclusion of a half dozen Halliwell descendants in the finale (who are blank templates) and the existence of time travel in-universe lend themselves to this, though the bulk of this type of fanfic focuses on Chris and Wyatt, the two descendants who canonically did travel back in time at various points to help the Charmed Ones.
• Every now and then, Criminal Minds will mention other, unseen BAU teams. One of them actually was showcased in the Season 5 episode "The Fight", which became the team for the short-lived spinoff Criminal Minds: Suspect Behavior. Another was the JTF-12 team-featured as the targeted victims of the Ian Doyle arc of Season 6—of terrorist profilers that Emily Prentiss was a part of before joining the BAU. And the number of agents in the BAU isn't hard-coded, meaning creators could create another agent to join the team. Care must be taken to ensure the new agent fits in with the team and everyone has their proper roles story-wise, as the cadre of characters can get confusing for the audience if handled improperly.
• Cutie Honey: THE LIVE has three girls based on three suits of cards. You can easily come up with a new one to represent clubs. In fact, the two other protagonists are a canon example of this: Honey's always had heart designs, but interpreting it as the suit hearts and coming up with diamond and spade girls with the same power is new.
• Happens many ways in Doctor Who fics:
  • Time Lords are established in canon as having multiple lives with individual personalities and appearances. Any Time Lord who has appeared in canon, including major characters like the Doctor, can effortlessly become an original character by regenerating them. Some examples of this:
    • During the Wilderness Years, future Doctors were quite fashionable. Some canonical examples include the Ninth Doctor played by Richard E. Grant, the Ninth Doctor played by Rowan Atkinson, the Doctor played by Nicholas Briggs, the Doctor from the Time Hunter novella series who smokes and wears muttonchops, the Doctor used in some Short Trips stories who has an aging apolitical hippie aesthetic (wearing a camel coat and lots of pachouli), and the Eighth Doctor Virgin tried to create before the TV Movie came along, who would've been "played" by David Troughton. And those are just official and semi-official examples — the fandom took it in even madder directions.
    • Coming up with original future Doctors, or alternative incarnations, based on actors the writer likes (or nearly got the role but never did) is a popular pastime. Big Finish's Doctor Who Unbound series was a series of one-shot audio dramas featuring various "national treasure"-type British actors having their turn at playing the Doctor.
    • Before he returned to the show in 2021, Russell T Davies got in on the future Doctor thing in his novelisation of "Rose", introducing two Doctors somewhere after Thirteen — one a tall, bald black woman wielding a flaming sword, the other an androgynous child in a hi-tech wheelchair with a robot dog.
    • The Thirteenth Doctor's era has her discover countless forgotten lives dating back to the beginning of Time Lord civilization, if not before, drawing on bits and pieces of things in the classic series. If you want to explore what might be buried in the Doctor's forgotten past, or their connections to Gallifrey's history, have a go at creating one of these incarnations.
    • In New series fics the introduction of the Chameleon Arch allows for any amount of Time Lord survivors hiding in the local populace. Subsequent events offer up additional opportunities for survivors, like the Doctor booting the High Council off Gallifrey in the Series 9 finale, and the reveal of at least one Time Lord operating outside the universe in "Flux".
    • The Master has even more scope for reinvention than the Doctor, to an almost limitless extent. He is stated to already be on his final incarnation by the time we first meet him as Roger Delgado, meaning twelve entire selves are unaccounted for on TV — even if you choose to include the War Chief as one of his previous lives, as many people like to, even if you include Big Finish's James Dreyfus Master, and even if you take seriously the implications that Missy is the first female incarnation of the Master, there's still a lot of room for invention. Even the Alex Macqueen Master used in the Big Finish audios is from the Master's second cycle of lives — and we don't know how many lives deep s/he is in his/her second cycle^note at least five (the Macqueen Master, the Jacobi Master, the Simm Master, Missy, and the Dhawan Master), possibly six, if you count the Titan Comics incarnation, or even whether it's the same length as the first (Rassilon in "Hell Bent" asks the Doctor how many regenerations they gave him, suggesting they're not bound to the old thirteen-lives limit any more). On top of this, the final Master of the first cycle incorporates all the on-screen Masters seen throughout the Classic series and TV Movie, as that incarnation got around his inability to regenerate by stealing bodies (after being a rotting corpse for a while), something he had no real practical limit to doing; the body the Master is in when he is executed by the Daleks at the beginning of the TV Movie was probably intended to be the body he took from Tremas, but, since the scene uses a very obvious Fake Shemp instead of the usual Anthony Ainley, it ends up being ambiguous.
    • Romana had two on-screen incarnations. The first of these is heavily implied to be her first, and her second is suggested to be the one she fought the Time War in, heavily limiting her scope for reinvention, but official Expanded Universe material nevertheless has used multiple Third Romanas, particularly the one used in the Eighth Doctor Adventures (based on Louise Brooks) and the one used in Gallifrey played by Juliet Landau. She's also unaccounted for in the New series as of yet even after the restoration of the Time Lords, except that she is no longer President...
  • Since there is a non-canon human version of the Doctor played by Peter Cushing, it's very common for fans to conceptualise a corresponding version of the Master played by Cushing's old Hammer Horror collaborator Christopher Lee. Although there are a few short stories and Doctor Who Magazine comic strips set in the Cushing-verse, this hasn't shown up in any official material yet...
  • Several incarnations of the Doctor have been based on other people, with unexplained Criminal Doppelgangers and unremarked-upon recurring casting appearing in the Classic series a couple of times, and the New series coming up with clever internal explanations for You Look Familiar. This naturally means it's possible to have doubles of any of the existing Doctors show up, with Actor Allusions of Doctors who played historical figures in other roles being especially common (particularly David Tennant's version of Casanova, who often gets paired up with Rose). The fact that Tom Baker's most famous casting before the Doctor was playing Rasputin the Mad Monk has come up in a couple of books and audio dramas.
  • In Classic series fics the Doctor would run into any amount of former classmates and Time Lord renegades who nicked their own TARDIS and legged it, semi-justified as it often happened in canon with the Rani, the Master, Drax, the Monk, etc.
  • In fics for both eras the Doctor would land the TARDIS and pick up a totally-not-a-self-insert-at-all new companion (semi-justified, as the Doctor has almost certainly had more companions than the ones on-screen).
  • For the vast majority of episodes, the only regulars are the Doctor and their one-to-three companions, featuring otherwise entirely new casts. Fanfiction can and has easily followed this formula.
  • A lot of Time Lord OCs tend to have TARDISes that look just like the Doctor's police box shape, despite the reason for that being a broken chameleon circuit, working TARDISes being able to camouflage into whatever environment they materialize in. Other popular variants are the red London telephone booths or the red police boxes like the ones that were in Glasgow.◊ Red London buses are also fairly common, with Iris Wildthyme and the televised story "Planet of the Dead" both featuring Doctor surrogates with space Routemasters.
  • The existence of a Black Guardian of Darkness and Chaos and a White Guardian of Light in Time was presented on screen as thoroughly dualist^note (see especially "The Ribos Operation", "The Armageddon Factor", and "Enlightenment"), but the "Guardian of X" formula nonetheless opened the way for other Guardians manifesting or protecting various facets of reality. Eventually this concept made its way into Extended Universe canon as a "six-fold god" that also included the Celestial Toymaker as the Crystal Guardian, plus an Azure Guardian of the Quantum Realm, a Silver Guardian of Space and Matter, etc. Other writers scornful of this development jokingly proposed increasingly ridiculous additional Guardians, including a Jolly Green Guardian of Frozen Food, an Ochre Guardian of Puffins, etc.
• Glee:
  • Many writers have yet to realize that adding a thirteenth member to New Directions throws off number balances, as there is usually an even split between boys and girls (Jesse didn't help that lesson sink in much either, even taking into account that his stay was temporary). As seasons pass, more members are canonically included.
  • Thanks to The Glee Project, many fanfic writers can cast contenders that didn't win as their OCs, which more often than not are usually just the contestant with a different name (sometimes not even that) and slightly more heteroflexible.
• Wesen are pretty easy to add to the Grimm canon. Pick an animal or a mythical creature, tack on a vaguely-related Germanic name and you're all set. New Grimms are even simpler, since anyone with a recently-deceased relative could discover they are one.
• Kamen Rider, especially in the Heisei era, has the potential in spades, especially with some series that leave the possibility open or even pointedly declare that it could happen.
  • There's a general rule of thumb for all Kamen Riders: Unless stated otherwise, the Rider Belts can work for anyone. Almost all the Kamen Rider shows have shown at least two people donning the same belt, with Kamen Rider 555 being the most memorable example, as all three main belts had a go at changing hands every so often.
  • Kuuga averts this somewhat. Yuusuke was the only rider in the show, but outside of the show, be it sequels or stories related to the show, there have been at least four other Kuugas. Two of which are from alternate universes, one of which now has his belt in Yuusuke's possession, and the last one, the one where the Sailor Earth potential kicks in, found a prototype belt.
  • Agito explicitly says that all humans have the potential to become Agito, and if they don't, there's always a G3 style suit lurking around. In fact, whatever happened to G1 and G2? The S.I.C. toyline actually makes use of this, by having a Lord find and fuse with the G1 suit, which had been in storage in the police department's basement with other prototype weapons.
  • Ryuki had this in spades, the existence of Abyss (see below) adding even more to it, as it was possible that any of the massive number of Mirror Monsters could become an Advent Beast for a new Rider. There was even a bit of teasing about this via What Could Have Been, with a piece of official art showing Kamen Rider Bleu, which is what one of the rider's friends would have looked like had he contracted GuldThunder (a Fenghuang-themed Mirror Monster) rather than reject the offer.
  • 555: It had five riders taking five Greek Letters, leaving eighteen more. There was also a stageshow which featured Kamen Rider Alpha, Beta, and Gamma, with What Could Have Been doing Alpha (again), Pi, and Theta. The one downside is that, for the most part, the wearer of the Driver has to be an Orphnoch or at least have a lot of DNA. But that's okay, more potential to Sailor Earth it. Even then, Delta was implied to be usable by normal humans. The movie also introduces a means of giving normal humans a way of using the Kaixa gear, but at the cost of destroying the gear itself.
    • An official artbook depicts three unused Rider Gears: Neo-Alpha, Seeda (theta), and Pyron (pi). Neo-Alpha is fairly standard, but Seeda is designed for groups like police and emergency workers while Pyron is a civilian suit intended for sports and recreation.
  • Blade is the only one outside of Kuuga to mostly avert this, as all four suits and the Joker of its Playing Card Motif are already taken. The Movie Riders had to share a motif, an artificially created card called Kerberos, so there's where the "mostly" comes in. It's possible to have riders based off artificially created Undead/Cards.
  • Hibiki also has opportunity, giving existing character Akira the ability to transform into Kamen Rider Amaki, and other side characters becoming Oni. And there is more than one Takeshi branch and they date all the way back to Feudal Japan.
  • ZECT was constantly producing new Zecters. All one needs to do is think of an insect.
  • Den-O's Imagin are based off Fairy Tales, so it's possible for one to make one based off an unused fairy tale. Kamen Riders in that setting are mostly made by bonding an Imagin to the suit, so you can also plop a pre-existing Imagin to make a new Kamen Rider. The Imagin Sieg was supposedly based on the story of Swan Lake, which actually had a black swan Evil Twin named Oderjean to the protagonist, white swan Odette — hence, this pic of Sieg's Evil Twin.◊
  • Kiva has tons of lore waiting to be fleshed out, like the First Kivat. The official materials mention 13 Demon Races, of which we only see about half. The others are specifically named (including fantasy staples like Mermaids, Yeti, and Goblins), but aside from vague details, the door is left wide open.
  • Kamen Rider Decade:
    • Interestingly, the series gained a canon Sailor Earth in the form of Kamata/Kamen Rider Abyss, an original character made for Kamen Rider Decade who uses Mirror Monsters that were seen but not contracted in Ryuki. And for extra fun, he's also a Sailor Earth for Kamen Rider Blade, being the Paradoxa Undead, which was named but never shown.
    • Also, Decade has Kamen Rider Kivala, empowered by a small, female Kivat-like bat-critter from the World of Kiva. She didn't operate in the World of Kiva, being Natsumi and all, but she's what a Sailor Earth looks like in canon. The Kiva story of S.I.C. Hero Saga seized this opportunity by giving Kivala a Kiva-canon partner, Megumi Aso.
    • There's also a plethora of Kamen Rider Decade/Diend clones out there that could grab up some remaining motifs, like a rider who can assume all the second riders' forms, etc.
    • With Zi-O establishing that the Decade riders now have cards corresponding to every rider up to Zi-O and implied to do the Reiwa Riders, there's still the open question of what the later riders' Final Form Rides would look like.
  • Double is super easy, as nearly any Gaia Memory (and thus, any rider or dopant) can be made out of any noun.
  • OOO had three Black Core Medals which were not used by Eiji. Several fan-arts created what would happen if Eiji used them for a combo. It's also very easy to make up entirely new sets of Core Medals: Just choose three animals that fit a theme. Rarely there are fan-created Greeed or even Kamen Riders (Maybe both) to go along with new medal sets. As for full-fledged Rider powers, that's simple; since the Kogami Foundation made their own Riders (Birth and Poseidon) in-canon after studying Medals, and Movie War Megamax shows them planning on creating new Core Medals, fanfic writers are more than free to do the same.
    • Toei actually engaged in this themselves in 2018 with the release of the Complete Selection Modification^note A series of high-end Kamen Rider prop replicas aimed at adult consumers version of the OOO Driver. All those unused Combos mentioned above (the Black Core Medals, Poseidon's Medals, and Kougami's Medals from Megamax) were given official costume designs◊ and transformation jingles.
  • Fourze is perhaps the only Heisei era rider that has little to no exploitable template like the other Riders do, since the only three riders seen in the show are the main rider, the secondary rider (which is based on a different sort of powerset than Fourze's), and a movie-exclusive rider who cloned herself off Fourze.
  • Wizard spells out what needs to be done to gain magical powers: someone needs to have magical potential in the first place, hit a Despair Event Horizon and cause that latent magic to form a monster called a Phantom, and then regain and hold onto hope quickly before the Phantom takes over your body and kills you, leaving it Sealed Inside a Person-Shaped Can. After that, there's just the matter of getting the belt and rings to go with it, which usually came from the White Wizard in-series. Or you can do what Kamen Rider Beast did and obtain a belt with a Phantom pre-sealed in it or bypass the entire thing by making an artificial Phantom and implanting it inside you. In any case, one of the major bits is to choose a mythological creature to base your Phantom on, as that usually influences a character's Rider form or their Super Mode.
  • Gaim manages to set up a formula right as it premieres.
    • Take a fruit/nut (e.g. Orange), take a kind of warrior (e.g. Samurai) and mash them together to make a Gaim Rider. There was originally a problem of how they get their hands on a Sengoku Driver, but midway through the series they started being mass-produced (if not distributed yet). Genesis Drivers are harder to obtain, as all of them are made and used by the villains, though at least two were handed down to Sengoku Driver users to act as upgrades. Though if you wanna make a Rider, best make them before the end of Gaim, since they spelled out that the Lockseeds and Drivers have all but been destroyed save for two, though the Sengoku and Genesis Drivers are easy to reproduce and Lockseeds have been shown to be artificially made or be handed to by literal gods, and in one of the post-finale specials, there are remnants of Yggdrasil handing out Drivers and Lockseeds still. Specifically, there's Gaim's Jinber Arms; while Lemon, Cherry, and Peach variants were seen in the show, just using the official Lockseeds there's also potential for Jinber Melon, Matsubokkuri, and Dragonfruit (though the design of the suit and the action figures would seem to indicate that only Melon could even theoretically happen, the Lockseed toys still have sounds for Jinber Matsubokkuri and Dragonfruit).
  • Drive has a pretty easy motif: vehicles. The main rider's based off a car, the second rider's based off a bike, and The Rival's based off a vehicle that's been modified. There's also a lot of copying going around (the monsters can copy people and research notes have been used to make copies) and thus, you can easily have an Evil Knockoff running around.
  • Ghost has an extremely easy motif: Dead people. Just pick a deceased person from history and you've got a power up.
  • Ex-Aid zig-zags this trope. On one hand, the "Gashat" game cartridges are based on various video game genres, which makes new ones relatively easy to imagine — just pick a video game genre (e.g. Platformer, Adventure), and imagine a name for the gashat; then, come up with the rider design and name. Or hey, just pick one of any number of real-life video games to base your character on; the show itself has some canon examples like Pac-Man. On the other hand, the creation of Gashats and the number of Gamer Drivers that use them are both tightly controlled — it's a plot point in the show when a Driver is damaged or stolen, as replacements can't be found easily. It's possible to bribe or blackmail the guy who makes them, but only if he sees you as a potential Unwitting Pawn. You also have to be immunized against a deadly virus to use them safely.
  • Build has an easy system for its power ups. Just pick something organic and something inorganic and there you go. Then. if you want to have to involve the canon origins of the Best Match, justify why said inorganic can kill the organic.
  • Zi-O has a blank cheque akin to Decade, but with the added caveat of Another Riders, monstrous versions of the original Riders. Almost every main Heisei era Rider is accounted for, but only one or two extra Riders being made into Another Rider.
  • Zero-One did some self-indulging by establishing that almost every Progrise Key can be used in any of the thirteen transformation trinkets. Designs have shown what'd happen if Zero-One were to use common Progrise Keys beyond his own set, but some take it beyond by making new Progrise Keys, which is easy to do given that one needs to think of an ability and an animal. And then it becomes even more indulgent, since the Big Bad's Villainous Legacy means that one can make Ark variants of other Zero-One Riders or even Riders in general.
  • Saber splurges on possibilities. The main Rider's belt uses up to three books at once, each categorized as "God Beast", "Animals", and "Stories". On top of that, there are other Riders who use different kinds of swords. Throw in the fact that they also have Elemental Powers and you have a recipe for a plethora of Riders and forms.
  • Revice returns to the classic Animal Motifs for the Main Riders, but with the added caveat of having the bonus forms also having the motif of past Riders.
  • Geats also goes for animal motifs, with each Rider having their own animal mask. Other than that, anything goes as far as their equipment is concerned, since the Raise Buckles are all interchangeable. A fan-made Rider could just be given a new generic weapon, or a more individualized weapon of choice to fit the character's style (which, canonically, every Rider has, even though not all of them survive long enough to obtain said weapons)
  • Monsters in the Kamen Rider franchise are easier to make. Especially with the Heisei era Kamen Riders, in which one can just select an animal motif that wasn't used before in that show. There are a few exceptions (like the Worms having only insect motifs, and rarely crustaceans, the Imajins, Zodiarts, and Phantoms needing to be based off a fable, constellation or mythological creature respectively), but the largest exception is, again, Blade, in which all 52 monsters are accounted for, though not all of them have appeared in the show, like the Stag Undead. Another large exception is Kamen Rider Drive, in which their 108 monsters are all accounted for, having at least one appearance in show (though they can get around the count via artificially made Roidmudes), though most of them are reduced to mook status, which means you could easily flesh them out and give them their own forms. However, it's easy in Double, where one just needs to think of a noun, and bam, instant Dopant.
  • Some Rider series also make it easy for new forms to be created, especially with the later Riders with the exaggeration of Merchandise-Driven Transformation Trinkets.
    • Kuuga? His forms all came to be because Yuusuke was thinking "I need to be able to do X!" and when it got really desperate, his suit turns a new color, gains a power... and loses one. To come up with new forms for him, you only need to think of a color that hasn't been used. (Red, white, blue, green, purple, black, and now gold — Decade does it again! — are taken. Anything else goes. You can also give "Rising" upgrades to your new forms, and give "Amazing" upgrades to new and old forms — if there's Amazing Mighty, why not Amazing Titan? Amazing Ultimate?)
    • Den-O? Just add another Imagin, original or existing.
    • Double? You don't even have to invent new memories from whole cloth. What if Philip and Shotaro used another Rider's Gaia Memories? Or even Dopant Memories? Nazca and Skull are pretty popular choices for those and Accel is even teased in the show, having Shroud's intention being to fuse Accel and Double's powers together. Canonically speaking, however, the non-existence of alternate Fang combos was explained by the Double novel, where it's mentioned that Shotaro's compatibility with the Joker Memory lets him put a leash on Fang's berserker tendencies; any other combo would result in Double becoming uncontrollable. However, in the Fuuto Detectives manga, FangTrigger and FangMetal do get used.
    • OOO? Core Medals can come in any animal motif, and the show even has created several that fall outside of the 21 Core Medals.
    • Also, Fourze introduces new Astro Switches via the "Hey, look what I whipped up today!" method, so new attachments for him can be easily introduced. However, there's a catch - it's established that there are only 40 Switches, all of which are accounted for, and the others are either usable by The Rival (Meteor and Meteor Storm Switches), abnormalities (Super Rocket and Super Drill Switches), or toys with little to no purpose in the show (Rider Switches).
    • Same with Wizard, except for rings and that there's no limit.
    • For Revice, just create a new Vistamp by combining an animal with a past Rider. Some existing Vistamps such as Batta, Turtle and Kujaku weren't ever used by Revice, so those can also be used for fan-made Genome Changes.
• The Lord of the Rings: The Rings of Power: Galadriel refusing Sauron's offer to be his Queen and rule Middle-earth together left a lot of free room for original characters or self-insertions who accept his offer and try to fix him. Some of the fanfics contain characters that are expies of Galadriel.
• Used to be common to insert a new survivor into Lost. In fact, the show itself inserted two new crash survivors into the plot during season 3, linking them to several significant events in their sole flashback. Not so common after season 5, which killed off every survivor that wasn't a main character, Rose, or Bernard.
• Being a prison drama, all you really need for an original character is a crime for them to have committed, but the Oz equivalent of Sailor Earth is usually the first or only woman in Em. City (bonus if she's allowed because one or more of the other prisoners promises to protect her, and was wrongfully convicted, whether because she's actually innocent, or because she murdered a rapist. Bonus points if the other prisoners agree to protect her because they think she shouldn't have been found guilty.
• This is easier in Power Rangers than you might think. Considering nearly every team leaves at least one common ranger colour out and the canon Sixth Rangers are allowed to join up late too, all it takes is to pick a season, pick a colour they didn't use, throw a little Deus ex Machina in here and there and voila! The White Ninja Storm Ranger! The Green Dino Thunder Ranger! The Black Mystic Force Ranger! And that's without getting into seldom-used or even non-canon ranger colours.
  • Parodied in S.P.D. in which one of the minor characters lied to his parents, claiming he was not just a ranger, not just the leader of the Power Rangers, but the first ever Orange Ranger. Ironically, Super Sentai did once have an Orange Ranger: Battle Cossack from Battle Fever J. A few other Orange Rangers emerged in Sentai years later.
  • Similarly, in a few seasons of Super Sentai there have been people who tried to join the rangers by making their own original ranger costume, which doesn't actually give them any powers. This has happened in Gekisou Sentai Carranger with White Racer, Bakuryuu Sentai Abaranger with AbarePink and Doubutsu Sentai Zyuohger with Zyuoh Human. AbarePink made a return in Kaizoku Sentai Gokaiger, much to Ahim's embarrassment.
  • With the government/military-based teams, it becomes a very simple thing to have a random joe in the organization get promoted and saddled with a blank power template. This is especially the case for S.P.D., which canonically had several squads of Rangers already. Indeed, it is a popular choice in fanon to give support characters who never transformed in canon the chance to transform themselves. This was teased in an episode of Mashin Sentai Kiramager, but subverted as the message was that the support did not need to fight to be of value to the team. Nevertheless, there was much demand for Zenkaiger's Flint Goldtweaker to transform seeing that it was she who created the gear for her brother, the Sixth Ranger; this wish was ultimately fulfilled post-series.
  • There are entire teams created to fill a Power-Rangers-Equivalent of Sentai teams preceding Kyōryū Sentai Zyuranger. Or the five normal Dairangers who never got their suits used. Some even go ahead and make future Ranger teams based on the most recent Sentai that haven't been adapted yet. Power Rangers Megaforce even indulged in some of this canonically, letting the rangers transform into unadapted Sentai teams, though the show gave little to no explanation for where these powers came from, only that they weren't from Earth.
  • Thanks to the number of additional mecha that get piloted remotely, it's easy enough to design new Rangers after them. Canon already has the Titanium Ranger (whose colors don't even match his Max Solarzord, but still counts) and the Jungle Fury Spirit Rangers. In toy form, we have the hideous repaints of the Operation Overdrive Rangers that come with the bikes, and three original Rangers for the Paleomax Megazord of Power Rangers RPM. Those are just the tip of the iceberg when you consider that Power Rangers Wild Force by itself has up to 94 unassigned Wild Zords, the majority of which were never defined in the show...
  • Beyond that, there are collectible trinkets that, whilst not having their own Ranger or mecha on-screen, can be made as such in fanon, such as Zyuden Sentai Kyoryuger (Dino Charge), Ressha Sentai Tokkyuger and Kishiryu Sentai Ryusoulger (Power Rangers Dino Fury). In the case of Kyoryuger, the 13 Guardians Zyudenchi were once mecha but only a fraction of them were seen.
  • There's also the Rangers or Ranger-like heroes that were in the Great Offscreen Wars and Cryptic Background References — previous Wild Force, Mystic Force, and Samurai teams existed and so little is known of them. Lotsa fanfic fodder there.
  • A semi-canon example exists for Ninpuu Sentai Hurricaneger in the form of TentoRaiger, introduced in the second season of Hikonin Sentai Akibaranger. However, she was a villain—so naturally, the door is left open for fans to imagine what a version of her on the side of good would be like.
    • TentoRaiger may have been inspired by a What Could Have Been plan for Ninpuu Sentai Hurricaneger's addaption, Power Rangers Ninja Storm, which would have added a female dark yellow ranger to the Thunder Rangers so that there would be two female rangers and the two ranger teams would both have three members.
  • Additionally, the monsters in the second season of Akibaranger are Sailor Earths for the monsters of the various official Sentai series, being designed in their style and following their Theme Naming. When three new members are added to a group of monsters that were named based on the days of the weak, this has the consequence of changing reality so there are ten days in a week.
  • It is also speculated that in the reality where the Akibarangers replaced the Dairangers, since KibaRanger became their fourth member there would have been a fifth member called ARanger, but no information is given about what ARanger would have looked like.
  • It took time for Super Sentai to introduce the Super Mode, whilst Power Rangers added the exclusive Battlizer armor relatively early on, which in turn inspired later Sentai power-ups. Battlizers are traditionally reserved for the Red Rangers, though a handful of other Rangers have received "Megabattle" armors. Super Modes are typically tied to mecha and vehicles, and may even entail combining with them. Over the years the Power Rangers toyline got in on the action by introducing a number of Battlizers, power-ups, vehicles and weapons, even original Rangers which never appeared on-screen.
  • Kaizoku Sentai Gokaiger has the heroes transforming into past Rangers and gaining access to their powers. In addition to the idea mentioned above (inventing new colors like Gokai White), one fairly popular fan art came up with the idea of Gokai Killer, an Evil Counterpart who could change into Ranger-like enemies like Bio-Hunter Silva, Duke Org Rouki, and Yaiba of the Darkness.
  • Keeping with Gokaiger, Sixth Ranger Gokai Silver can combine Ranger Keys, allowing him to turn the two Sixth Rangers of Go-Onger into one, the Red and Green Gokaigers into Gokai Christmas, and combine the first fifteen Sixth Rangers into the Gold Mode armor. One wonders what other combinations are possible.
  • In the thirtieth anniversary movie of Super Sentai a special ranger called AkaRed who is the embodiment of all red rangers appears, and has since reappeared once every five years for anniversary celebrations. This has lead to speculation that there are other rangers like him who each embody a different ranger color and would be his teammates. During one of his later appearances he confirms that other rangers like him do exist but the blue member of his team is called AkaBlue, not AoBlue, though this happened in a non-canon miniseries so this might not be true.
  • Power Rangers Dino Charge is the first season without a yellow ranger, which means there are plenty of fics out there where someone finds the missing yellow energem and fills that gap.
  • One of the unadapted sentai teams that showed up in Super Megaforce were the Super Sonic Rangers, who were based on Chikyuu Sentai Fiveman. A Power Rangers comic book reveals the backstory of these team. The team included an original Sixth Ranger, Super Sonic Green, who became a Sixth Ranger Traitor, and destroyed the team and then became an original Psycho Ranger, Psycho Green.
  • Battle Fever J had each Ranger be based on a different country. That's 5 down, but there's the potential for hundreds more.
  • Uchu Sentai Kyuranger has 12 Rangers, each based on one of the 88 Constellations. 12 down, 76 to go.
  • Kikai Sentai Zenkaiger, a Milestone Celebration similar but different to Gokaiger, has a team of heroes derived from previous Super Sentai whom inspired the creators of their gear in-universe. Zenkaiser, the leading hero, is essentially a modernized version of Akaranger, the original Red Ranger, but colored white to reflect Goranger's Variblune mecha and with the number 45. He is accompanied by four Kikainoids, mechanical people who can transform into both Rangers and mecha, each are modeled on one of the previous Sentai (Zyuranger/Gaoranger/Magiranger/Boukenger) and are numbered as such. Sixth Ranger Twokaizer is based on the Gokaigers, resembling a golden version of Gokai Red. In addition, he is supported by two little brothers who transformed into super-deformed robot mecha, each based on a past Sentai (Ohranger and Shinkenger). Rival characters Stacaesar and Hakaiser, created by a villain who has studied Sentai as well, are based on Battle Japan and Fire-Stealth Captor 7, the latter being the red hero of Ninja Captor, a contemporary of Goranger which has been likened to Super Sentai but is not officially classed as such. With all this referencing, fans have had fun making up new characters based on other previous teams.
• Golden-Road.net, a fansite for The Price Is Right, is usually rife with people submitting their own original ideas for pricing games. When GSN's message board was active, they had members creating what they thought were improved versions of existing or once existing shows ("Password Ultra," for example) or TPIR pricing games.
• The most common way to parody The Real Housewives is "The Real Housewives of [city where the writer lives that hasn't been given its own series]," where each cast member represents a different local stereotype played up. Bonus points if it's a traditionally blue-collar city like Boston or Pittsburgh and the ladies are as trashy as can be.
• There are said to be 127 Elements in Sapphire and Steel, of whom four appear in the televised canon and two more in audio adventures. This leaves ample opportunity for fan writers; they need only pick the name of an element, gemstone or alloy that hasn't appeared in the show, and endow them with appropriate characteristics and powers.
• Any series with a Monster of the Week formula, like Smallville, makes it easy to introduce a new superpowered character.
• There are several teams in Stargate SG-1 that have been mentioned but never seen, leaving a lot of wiggle-room for fans. This one especially is really easy, as not only is Stargate Command just a US Government agency instead of some weird group of Destined Ones, "SG-1" itself is just a serial designation. Want a full roster of OCs? No problem, welcome to SG-7. Making it even easier is the fact that there are at least 9 SG teams in canon from the very first episode, up to at least 25 by the 10th season, with the audience getting to see what SG-1 is doing 99% of the time, with the occasional appearance to SG-2, SG-3 or SG-4 members. That's at least 100 potential characters. Add to that the fact that the teams are at least somewhat specialized (to say nothing of the Russian team, with a new one most likely being formed after SG-4 was wiped out), and you've got even more to play with. And that's not even counting the people who are almost certainly going to add SG-0 as a secret black ops unit that's better than SG-1 but who nobody knows about.
  • With the upcoming Stargate MMO, it seems likely that players will get to take their SG-Whatevers into the virtual plane. Watch as clans of avatars take on even the toughest of Goa'uld! Video games are generally all about that.
  • The Goa'uld themselves. Even with the necessity of excluding the Norse pantheon, there's a vast number of mythological deities who were never used in canon. That's a lot to pick from if a fanfic writer wants an OC villain for their OC characters to confront. And with regard to the Norse pantheon, only a handful of the Asgard actually made appearances in canon.
• Common are Star Trek fanfics about Starfleet, since we don't even know how many ships there are. At an absolute minimum there must be hundreds.^note Word of God from Ron Moore specifies a 30,000 ship fleet as of Star Trek: Deep Space Nine. There are many ships that the main heroes cross paths with for one episode, and it's easy to crew them with OCs.
  • It's also possible to do it with ships, as they have themes. Need a new DS9 runabout? Think of a river! Need a new ship the same class as the local version of the Enterprise? Think of a modern battleship!
  • This is also possible with military and crime stories in a contemporary setting like JAG, NCIS & NCIS: Los Angeles.
  • This is done in the Star Trek Novel 'Verse, in which the Titan, Riker's command as of the end of Star Trek: Nemesis, is a Luna-class starship, and each starship in that class is named after a moon...thus giving endless Fan Fic opportunities there. Nor does it necessarily have to be a moon from our solar system; for example, the names of two Bajoran moons are known. Likewise the Star Trek: Destiny series establishes that there are at least seven Vesta-class ships, four of which are named after four of the seven hills of Rome (meaning Palatine, Viminal, and Caelian are still open).
• There's enough wiggle room in Stranger Things for one to create a new character who was experimented on by Hawkins Labs. 8 and 11 appear on the show, with 3 and 6 appearing in a tie-in comic, but that leaves another seven super-powered individuals who could potentially exist and meet the rest of the Party.
• A common occurrence in the Supernatural fandom is to create one or more new hunters, often a set of sisters as counterparts to the Winchesters brothers the series revolves around. In the Supernatural universe, this isn't impossible, since hunters exist across the world. While some people create interesting additions to the universe, most are blatant self-inserts, especially because if these characters are female, the boys seem to fall for them by the end.
• The same thing happens with Torchwood, for which the main characters for series 1-3 worked for "Torchwood 3" — though canon gives explicit designations for 1, and 2, 4 has vanished and is easily brought back for fanfic purposes, and it's not entirely ridiculous to imagine there's Torchwood 5, 6, e, -90423, or what have you. By Children of Earth, however, it seems that all Torchwoods had been shut down, leaving only a remnant successor with no permanent base two years later. It used to be that you could at least insist Torchwood was solely based in Britain. Following the introduction of Torchwood India in the audio drama "Golden Age", it's quite reasonable to assume there are branches all over the former British Empire, as Torchwood was founded by Queen Victoria. Audio drama "The Dollhouse" extends it even further, as it introduces the first branch based outside the Victorian Empire, Torchwood Los Angeles.
• Ultraman R/B has two variations. You can either go for:
  • a) The R/B Crystals allow Rosso and Blu to augment themselves with different elements. Toy-wise, only four elements are available (Taro/Fire, Ginga/Water, Tiga/Wind and Victory/Ground), so you can use any other element and make a Fan Fic variant of elemental forms (eg. X/Lightning can turn Rosso into a green-colored lightning form).
  • or b), if the user is not an Ultraman, it will transform into a variation of its respective Ultraman, just like Makoto Aizen using the Crystal of Ultraman Orb to become Ultraman Orb Dark. The result would be another copy of the Ultraman in R/B Crystal altered to reflect their user.
• Fanfic authors for Unnatural History enjoy pairing up the already hinted Maggie/Jasper relationship, and writing in an OC (usually very well-travelled as well) to act as a Love Interest to Henry...when they're not writing Henry/Jasper.

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