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  • In Life Is Strange, Max was just a normal, everyday human who suddenly manifests unexplained Time Master powers. In Becoming more than what I am., Max is an angel who's natural divine ability is the Time Rewind Mechanic, similar to Amenadiel's slow-time powers and Lucifer's Compelling Voice.
  • Becoming the Mask: James Lake Jr. is not the protagonist of the story. Instead, the story is centered around Jim, the changeling that replaced the actual James Lake Jr. and has lived his life in his place since infancy, and it is this very changeling that looks after Barbara, has made friends with Toby and is chosen by the Amulet to become the Trollhunter.
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  • In "Boston Bound Fae", a crossover with Lost Girl and Rizzoli & Isles, characters like Jane Rizzoli, Barry Frost and Charles Hoyt are all 'reinvented' as Fae; Jane is a wolf-shifter, Frost is a siren, and Hoyt is a Torak (a Fae who feeds on fear the blood of their victims).
  • The Bridge has numerous ones, mostly on the "Amalgam'verse" world the kaiju hail from.
    • The Godzillas' note  vaguely defined base species, the "Godzillasaurus" is either a Tyrannosaurid or not a dinosaur at all, but a non-mammalian Synapsid depending on which Toho source is used. Here the Godzillasaurus is explicitly identified as a type of Ceratosaurid.
    • Baragon, Anguirus, Yonggary, Rodan, Varan, and Raiga have all gone from unidentified dinosaurs to chimeras created through ancient science and mysticism altering a base template. In particular Baragon's template was instead a Dicynodont therapsid and Varan is mentioned to have her genome modified from a monitor lizard. Yonggary has also gone from a theropod to a prosauropod and Raiga is now a modified Godzillasaurus.
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    • Mothra Lea is referred to as a mothra, however she is actually a hybrid of a mothra and battra.
    • In the retelling of Dinosapien, Equestria Girls: Dinosapien, the dinosaur species were shuffled. In the TV show the protagonist dinosaur, Eno, was a descendant of Dromaeosaurus; and the two antagonist dinosaurs, the "Diggers" are pachycephalosaurs. Here the "Diggers" replacements are dromaeosaurids descended from Dakotaraptor; and Eno's species is something else, heavily implied to be a troodontid. Eno is now sporting a full coat of feathers, whereas before he only had them on his head and tail.
    • King Kong is identified not as a gorilla or descendant of Gigantopithecus, but a Hominin descendant of Ardipithecus, meaning he is actually a close relative of humans.
    • Monster X is no longer a single specimen entity but the results of an Xillian volunteer splicing himself with Grand King Ghidorah's genes and essence.
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    • The Sirens are no longer a unique species but the results of very nonconsensual crossing of three Windigos forcing themselves on two mermares; meaning they are hybrids.
    • On the Jurassic Park and Carnosaur side stories, the Velociraptors are changed to be Deinonychus and the Spinosaurus has gone from a vaguely defined genetic experiment to a deliberate hybrid creation built off a real Spinosaurus template, much like the Indominus rex was.
  • Child Born of Love: Many characters received changes due to the fanfic being written and concluded before the finale of the canon manga.
    • Death the Kid was a full shinigami created from an aspect of Shinigami-Sama's soul in-canon. Here, he is a Half-Human Hybrid.
    • In-canon, Chrona is the androgynous non-witch child of Medusa (implied to have been created artificially). Here Chrona is female and a demi-witch (a rare and dangerous breed of witch that is usually exterminated at a young age) and eventually revealed to be the fabled "Witch of Destruction".
    • In-canon, Noah is revealed to be an Artificial Human spawned from the Book of Eibon as a conduit to spread the Madness of Knowledge. Here, he is a warlock and former mister-partner of Kid's mother Maria.
  • Citadel of the Heart:
    • DinoSquad RX has gone through two iterations, both being fanfics named after and based upon the series Dino Squad. Victor, known in the canon series as "Victor Veloci", no longer has the morph of a Velociraptor in this fic, and his Big Good counterpart Ms. Moynihan, who was also a Velociraptor in canon, has a different morph as well. Both of them, however, are of an unrelated species. Ms. Moynihan becomes an Acheroraptor in this fic, as her having originated from the end of the Cretaceous is still a part of her origin, and having the morph of a species still alive immediately beforehand but still close enough in attributes to Velociraptor was required. She even has feathers. Victor, meanwhile, has a completely man-made species modeled after the Raptor Attack stereotype to turn himself into a weaponized animal built for extensive agility and combat, and having none of the restrictions in agility that a real-life non-avian dinosaur would have, and also lacking feathering.
  • Dark Dark Ocean Dark is a mundane equivalent of Malachite being forced underneath the ocean by Lapis. In the fic, all the Gems are human, and Lapis instead keeps a kidnapped Jasper locked in her basement.
  • The Dark Lady: Downplayed. Gideon is still human, but because he was conceived and born in the Enchanted Forest while Rumpel's curse was still in full-effect, Gideon was born with the same scaly-skin, as well as an affinity for magic.
    • Robin II's name is brought up as being nothing but a coincidence, instead of being named after Robin Hood. This is because Robin Hood is not her father, with mentioning that she is a Demi-god, implying her father to be Hades.
  • Date A Re:Live: In the source material, Tohka Yatogami was born a Pure Spirit as revealed in Volume 18, in this fanfic, she was born a human prior to becoming one of the Sephira Spirits.
  • Deep Dish Nine is a series of Alternate Universe Fic's of Star Trek: Deep Space Nine and occasionally other Star Trek series that, among other things, turns all the non-humans into humans. Oddly enough, they still have names like "Nog" and "Odo".
  • A Diplomatic Visit: In canon, Queen Novo was a hippogriff who changed into a seapony. In this universe, she was always a seapony. The same holds true for her daughter Princess Skystar, her sister Ocean Flow, and her niece and nephew Silverstream and Terramar. Subverted with the siblings' father Sky Beak, whom Spike initially assumes was also a seapony originally, before he corrects him and explains he was born a hippogriff and changed into a seapony with the Pearl of Transformation.
  • Disney High School: All of the main characters are humans, even if they were mermaids, gods, video game human characters or Toons (human ones or of other species) in their respective movies. The creator has noted that she won't be trying to humanize outright animal characters, however; perhaps the most radical change so far is Kristoff's family, who still look pretty trollish.
  • In Dragon Ball Z Abridged, thanks to Ascended Fanon, Mr. Popo is changed from a genie into a Majin, specifically, the future form of Dumplin, the lead of TFS's Dragon Ball Xenoverse Let's Play.
  • In EQuestria Girls Marvel Universe the Spike in the human world is revealed to be a human instead of a dog like in canon. When Flash Sentry and the Rainbooms discover that Spike isn't a dog like the Equestrian Spike becomes they are all surprised. Also, it is later revealed Spike is actually a mutant.
  • Evangelion 303 turns Rei and Kaworu into humans. In the original show, they were Angels.
    • It's actually not uncommon at all for Evangelion fanfics to do this. It helps that the show itself did it during the Imagine Spot in the final episode.
  • The Pokémon/Beast Wars crossover Pokémon Wars: Transformers has the Maximals and Predacons land on the Pokémon World rather than Prehistoric Earth and thus use Pokémon as their disguise forms instead (which also results in most of them using new aliases);
    • Optimus Primal is a Blastoise.
    • Megatron is a Feraligator.
    • Cheetor becomes a Houndoom and is renamed Blaze-Hound.
    • Rhinox becomes an Aggron and is renamed Aggronix.
    • Rattrap becomes a Raichu and is renamed Shockrat.
    • Dinobot becomes a Charizard and is renamed Chari-Tron.
    • Waspinator becomes a Bedrill and is renamed Bee-Driller.
    • Terrorsaur becomes an Aerodactyl and is renamed Aerosaur.
    • Tarantulus becomes an Ariados and is renamed Ariadox.
    • Scorponock becomes a Scizor and is renamed Scizornex.
  • The Touhou fancomic Four Seasons House, which is a High School A.U., changes the entire cast into mundane human beings with none of their abilities from the games (the sole exception is Reimu, who's still a Miko and has abilities related to that like seeing spirits. Characters who were part animal originally like Reisen wear Animal Eared Headbands in order to retain their familiar appearances.
  • Arguably applies in Frozen Turtles in Space, when Sven is transformed by mutagen from a standard reindeer into a humanoid mutant, allowing him to speak and giving him enhanced strength.
  • In the Gargoyles fic "Guardian of the People", Elisa is a gargoyle from the beginning; the first chapter explores how she was taken in by her 'grandfather' as an egg after most of her gargoyle clan were killed or died of old age, and was essentially raised by the Mazas as a sibling to Derek and Beth after Peter moved to New York due to her slow growth rate.
  • Harbinger (Finmonster) (Danny Phantom, ParaNorman): Ember McLain is changed from a ghost (aka a deceased human) to a banshee, which in this universe is a person chosen as an agent of the Fates.
  • In the Darker and Edgier Captain Carrot and His Amazing Zoo Crew! fic The Harmony Trap, the counterpart of Rubber Duck (and sometimes Fastback) is an eagle, and the counterpart of Little Cheese is an armadillo. Since they're both shapeshifters, they can take the appearances people expect from the comics, but those are their true forms.
  • In Hybrid Theory, where he appeared before it was revealed in the source manga, The Major from Hellsing is a vampire, rather than a cyborg.
  • Ill Met by Moonlight: In the canon show, characters are either Gems, Humans or a hybrid of the two in the case of Steven. Here, they are either human or a different type of supernatural monster.
  • The Infinite Loops: Variant loops often have loopers change species, even if there normally aren't multiple species in their loop. In particular, loopers going to the Equestria Loop and vice versa almost always change species (and it's weirder when they don't). Speaking of Equestria, in The MLP Loops Silver Spoon ends up going through a lot more of these than normal, to the point that it's surprising when she's an ordinary earth-pony. Twilight assumes Silver's species tag got knocked off in the Crash, but it's too low-priority to be fixed quickly.
  • Heero Yuy in The Pirate's Soldier goes from a being an extensively trained, Made of Iron, but otherwise normal human to being of Juraian descent, which is the in-story explanation as to why he survived so many ordeals that legitimately should have killed him. This is largely due him to being a Composite Character with Tenchi, as it's eventually revealed that Yosho/Katsuhito Masaki is his maternal grandfather.
  • In The Geeky Zoologist's reimagining of Jurassic World, Owen Grady's raptors are achillobators while they are velociraptors in the film.
  • In the Kim Possible/Grimm crossover “A Grimm Possibility” and its sequels, not only are Kim and Anne now Grimms (with the possibility that Jim and Tim will also manifest later), but many of Kim’s friends and enemies are different kinds of Wesen, including;
    • Bonnie Rockwaller is a Ziegavolk who flees school after Kim identifies her.
    • Ron is an eagle-esque Wesen (identified as a Mannschaft Falken, a species that didn't appear in the original show), who becomes Kim's boyfriend.
    • Tara is an Eisbiber whose parents run a hardware store.
    • Monique is a Luisant-Pêcheur who is rescued from her abusive adopted Skalengeck parents by Kim and Anne.
    • Shego is a Dämonfeuer pursuing her own vendetta.
    • Adrenna Lynn is a Ende der Zieten Grimm who tries to capture and brainwash Kim to join her.
  • Last Child of Krypton turns Shinji Ikari into a Kryptonian. Asuka also becomes one via bio-engineering in the story's second version.
  • The Last Daughter, and its rewrite The Girl of Tomorrow, turn Taylor from Worm into the titular last daughter of Krypton.
  • In Hans Von Hozel's Little Red Riding Hood fic, the Wolf is replaced by a bear.
  • The The Lord of the Rings fanfic Leglos haz da ring (sic), Legolas is a vampire, even though canonically, he's an elf.
  • The Many Dates of Danny Fenton: Katie Kaboom's transformations were never given an explanation in Animaniacs, only meant to be a joke on No Periods, Period. Here, it's suggested she's a mutant, like the X-Men.
  • The infamous Harry Potter fanfiction My Immortal turns Draco Malfoy, a human, into a vampire and Sybil Trelawney, another human, into a [[{{Damphyr vampire-human hybrid]].
  • In My Huntsman Academia, humans with Mutant Quirks like Tsuyu and Mina are retooled into Faunus.
  • In the My Little Pony: Equestria Girls films, Spike is a dog in the human world and is the human Twilight's loyal pet. In Yugioh EQG Spike is human like the rest of the characters and is Twilight's adopted little brother.
  • MCU Rewrites: In this rewrite of Avengers: Age of Ultron, Wanda and Pietro Maximoff, who in the film were humans who got their powers through HYDRA's experiments, were changed into mutants who got their powers enhanced by HYDRA's experiments as well as their father being implied to be X-Men villain, Magneto, which is confirmed in New Avengers.
  • TheNamelessDoll's fan-video Wings turns Jack Frost into a fairy so that he can be shipped with Periwinkle.
  • In Neither a Bird nor a Plane, it's Deku!, Izuku Midoriya is a Kryptonian instead of a Quirkless human, with both the Superpower Lottery and the angst that comes with being the Last Son of Krypton.
  • Nobledark Imperium:
    • The Squats, in canon (back when they were canon) were their own separate race of abhuman, similar to the Ogryns or the Ratlings. Here, it's made clear that the Squats only have their short stature and physical traits because they were raised on their homeworlds, and that children born of Squat parents in more human-normal environments are basically indistinguishable from baseline humanity.
    • In canon, the Emperor is a Humanoid Abomination bordering on Eldritch of unknown origin. Here, the Emperor/Steward/Oscar is a "Man of Gold," basically a Mechanical Abomination created by the Great and Bountiful Human Domain (the Precursors of the Imperium who ruled the galaxy during the Dark Age of Technology and the Age of Strife) and who is also the closest thing that humanity's ever created to a Warp God.
  • Our Own League universe:
    • Lex Luthor's Girl Friday/Bodyguard, Mercy Graves, is either a well-trained human or an Amazon in canon DC works. In Teen Titans: Together for Tomorrow, she is a Robot Girl designed to live up to Lex's idea of his "perfect" woman.
    • Similar to the direction taken in Justice League Unlimited, Hawkman and Hawkgirl's original lives, Khufu and Chay-ara, were Thanagarian Ancient Astronauts rather than Ancient Egyptian nobility.
  • In Pokémon Reset Bloodlines, as a result of the creation of a new timeline, many characters, including Ash, became bloodliners, essentially humans with Pokémon-related abilities.
  • In The Prodigal Grandson, James Bond is reinvented as a former Time Lord assassin, Yamesbohbnd, who accepted exile to Earth after he accidentally killed the wrong world leader on a mission for the Celestial Intervention Agency; each actor change is the result of Bond regenerating.
    • James Bond being a Time Lord is actually a fairly popular trope among James Bond / Doctor Who crossovers.
  • In The Queen's Consort, with the exception of Flynn and Maleficent (who was already a fairy) all of the characters are portrayed as nature-based fairies.
  • Penny is human in Ruby and Nora.
  • In the RWBY/Marvel Cinematic Universe Fusion Fic In Shades of Red and Gold, several characters from RWBY are changed from humans or faunus to being mutants (even though mutants don't exist in the Marvel Cinematic Universe), including Ozpin, Velvet, and Blake, and implied with Goodwitch and Coco (possibly also Weiss and team JNPR). As well, Beacon Academy becomes Beacon Institute, the West Coast equivalent of the Xavier Institute, even being cofounded by Ozpin and Xavier. Word of God states that Ruby and Yang aren't mutants. Also, Zwei is a Robot Dog.
  • A bunch in the RWBY/The Hobbit Fusion Fic Rise of a Star Knight and its sequel (and the The Lord of the Rings to its The Hobbit) Knights of Remnant: The Ring of Shadows:
    • First, goblins are actually faunus, or rather, were faunus, who hide in the mountains and stayed separated from the rest of their species for so long they evolved into something else.
    • Thorin and his party are replaced by Jaune and his party of humans and faunus, with the dwarven civilization as a whole replaced by the Valkyrie clan(as in, Nora Valkyrie's massive extended family, who are master miners, stoneworkers, and resident people who delve to greedily and too deep)
    • Elves are replaced by humans and faunus, depending on the group.
    • Uruk-hai, trolls, Smaug, and other such things are Grimm, though Smaug Was Once a Man, the Mad King of Vale Felix(yes, that Felix).
  • Used so much in the RWBY/World of Ere story Not Your Saint George that it would be easier to list the RWBY characters who have appeared so far that haven't had their species changed note 
    • Pyrrha is Pyrrhanykos, a youngnote  red dragon.
    • Ruby, Yang, and their family are werewolves, with Summer, Raven, and Qrow also being orcs.
    • Nora is a goblin, while Ren is a hob (a catchall term for people who are part-orcs)
    • Winter and Weiss are hailene.
    • Blake is a cat hengeyokai.
  • The RWBY fanfiction story Vale's Underground takes place in a real-world setting. So various Faunus characters in canon who appear in the story can be assumed to be just plain humans.
  • In REMNANTS, Faunus are a Human Subspecies that mutated generations ago, rather than a separate humanoid species.
  • In the Scootertrix the Abridged series, Rarity was changed from being a normal unicorn, to a changeling that defected from her species.
  • In the original Sonic the Hedgehog (2006), Princess Elise and her father are humans. In Sonic the Hedgehog: Heroes of Mobius, they're Mobian jaguars.
  • In Steven Universe: and the Hunters of Arcadia, Jamie is revealed to be a changeling spy sent by the Janus Order to gather intel on all of the magical weirdness in Beach City.
  • In the original series, Asuka is fully human. In Superwomen of Eva 2: Lone Heir of Krypton she's half-Kryptonian.
  • In The Eye of the Storm, it's revealed that Sadie's father is actually a Gem, making Sadie a Half-Human Hybrid instead of a full human.
  • Ultimate Spider-Woman does this to Spider-Man villain the Chameleon, who is turned from a human (who, depending on how he's written, is either a Master of Disguise or a mutated human with Shapeshifting powers) into a mutant, and the brother of X-Men villain Mystique.
  • The H-Files is a Crossover between The X-Files and My Little Pony: Friendship Is Magic where Mulder and Scully are ponies.
  • In Who is Hoshi Sato?, Hoshi Sato from Star Trek: Enterprise is changed from a normal human (albeit a genius) to a strange half-human, half-... some type of crazy humanoid who can turn into a wolf at will and has heightened senses.
  • You and Me (and Everyone in Between) changes Penny from a robot to a human.
  • In the Bizarro World of Zelda and the Manacle of Cahla, Link's horse Epona is Prince Link's nanny and Parental Substitute Eppie.
  • Yin-Yang:
    • As revealed with both Mara and Adora, the First Ones in the show were humanoid to the point where it's almost impossible to tell the difference between them and normal humans at a glance. In this fic, the First Ones, aka the Hok, are an almost angelic species, being winged humanoids.
    • While Veena's species in the show was unknown, she was implied to be native to Eternia. Here, she's a member of the Hok.
    • In the show, Adora was purely a First One. In this fic, she's an Eternian who descends from the First Ones. Same for Mara as well.
  • Defenders of the Universe:
    • Keith is a pure Galra in this story rather than a Half-Human Hybrid like he was in canon.
    • Lance goes from a human to an Altean here.
    • Hunk, rather than a human, is a Balmeran.
    • Pumpkin is an alien species called a "veggitoid" instead of being a sentient pumpkin.

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