History AdaptationSpeciesChange / FanWorks

* ''Fanfic/SupermanHouseOfEl'': Downplayed. [[spoiler:In the comics, Lori was a mermaid from Atlantis before it was solidified that Superman and Aquaman live in the same continuity, she was retconned into being from a different part of Atlantis with more traditional mermaids. In this fic, she's largely indistinguishable from other Atlanteans. Though she does retain the telepathy of her comic counterpart, which she claims is unique among her people.]]

[[AC:''Franchise/{{Superman}}:]]
* ''Fanfic/SupermanHouseOfEl: Downplayed. [[spoiler:In the comics, Lori was a mermaid from Atlantis before it was solidified that Superman and Aquaman live in the same continuity, she was retconned into being from a different part of Atlantis with more traditional mermaids. In this fic, she's largely indistinguishable from other Atlanteans. Though she does retain the telepathy of her comic counterpart, which she claims is unique among her people.]]

* MassiveMultiplayerCrossover ''Fanfic/WithPearlAndRubyGlowing'' takes place in a modern setting, so several non-humans become humans, fantastical pets become real animals (such as [[WesternAnimation/LiloAndStitch Stitch]], an alien that pretends to be a dog, becoming an actual dog), and some animals that aren't convenient for a city are changed to smaller animals ([[WesternAnimation/GravityFalls Waddles]] the pig becoming a guinea pig). Averted in cases of RuleOfFunny: [[Franchise/{{Frozen}} Sven]] is still a reindeer, and ends up trapped in Kristoff's apartment after some AlcoholInducedIdiocy.
* ''Fanfic/TheHaterGood'': Humans are said to be almost non-existent in the universe, so [[WesternAnimation/SanjayAndCraig Sanjay]] is changed to a dragon and [[WesternAnimation/FanboyAndChumChum Fanboy and Chum Chum]] are a hedgehog and raccoon respectively.

* ''Fanfic/WhatTheWaterGaveMeThirteenSentinels'':

* AdaptationalSpeciesChange:

!! By fandom

[[AC:''VideoGame/ThirteenSentinelsAegisRim'']]
* AdaptationalSpeciesChange:
** Natsuno is a [[OurMermaidsAreDifferent mermaid]] in this fic. And it's revealed that all of the female pilots from ''13 Sentinels'' are her podmates in this AU.
** BJ goes from a robot to Natsuno's [[AnimalCompanion crab companion]].

** ComicBook/{{Static}} and [[ComicBook/TeenTitans Garfield Logan]] are both mutants, instead of metahumans, due to being the nephews of ComicBook/{{Storm}} and ComicBook/{{Beast|MarvelComics}}, respectively.

* In ''[[https://www.fanfiction.net/s/1669424/1/BTTX BTTX]]'' and its sequel, Doc Brown and Marty [=McFly=] (''Franchise/BackToTheFuture'') realise that they are mutants (Film/XMenFilmSeries); Doc can manipulate electricity and Marty can stop time (naturally Doc's sons are also mutants).

* In the ''Series/Lucifer2016'' fic "[[https://archiveofourown.org/works/36162718/ The Devil and His Urchin]]", Trixie is Lucifer's daughter rather than Dan's, as Lucifer and Chloe had a one-night-stand during a rocky period in Chloe and Dan's relationship. While Lucifer "recognises" Trixie as half-celestial when he meets her even before realising he's her father, she initially displays no obvious powers, but is later revealed to be able to sense celestial energy (allowing her to realise that Lucifer and Maze aren't human even if she doesn't know what they are instead), and later grows wings that match Lucifer's.

* In "Falling Hope, Rising Threat", the sequel to ''Fanfic/AManLikeNoOther'', Octavia Blake [[spoiler:is revealed to be half-Frost Giant through her biological father, Loki]].

* ''Fanfic/TheMarvelousWorldOfDC''
** ComicBook/{{Brainiac}} is a Kryptonian supercomputer, instead of a Coluan android, just like in the DCAU and ''Series/{{Smallville}}''.
** [[ComicBook/DoctorFate Kent Nelson]], [[ComicBook/DoctorStrange Steven Strange]], and June Moone were born magic, instead of gaining it later in life.
** ComicBook/{{Hela}} is half-Olympian, half-Asgardian, because she's the daughter of Hades, not Loki. The same goes for her brother Pluto.
** ComicBook/{{Static}} and [[ComicBook/TeenTitans Garfield Logan]] are both mutants, instead of metahumans, due to being the nephews of ComicBook/{{Storm}} and ComicBook/{{Beast|MarvelComics}}, respectively.

* ''Fanfic/JoJoNewUniverse''
** Every equine character in ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', from Twilight Sparkle to Princess Luna, is now a human.
** Rei Ayanami from ''Anime/NeonGenesisEvangelion'' goes from a human Clone to a [[HalfHumanHybrid half-human, half-Gigan]] since her father is [[Manga/JoJosBizarreAdventureBattleTendency Wamuu the Pillar Man]].
** Morgana in ''VideoGame/Persona5'' is a cat that thought he was a transformed human [[spoiler:but is reveal to be the manifestation of humanity's hope]]. Here, he was a normal cat that gained the Stand Anything Goes that lets him transform into various forms, even a human boy.