History Fanon / SonicTheHedgehog

* It's common for Sonic to call Amy "Ames" as a [[AffectionateNickname pet name]] in Sonamy fics or fics where they both have a friendly relationship.

* A sillier example. but ever since the initial script for ''VideoGame/Sonic Lost World'' had leaked before the game's release, people toke immediate note of the hilarity of the dialogue's surprisingly violent language. Two of Zazz's lines in particular, "You're going home in a box!" and "I'm gonna skin you alive!", quickly made the rounds, with the former being spun from its original threatening intent into Zazz having an affinity for literal cardboard boxes.This became a universal part of his character for a LOT of fans, especially in more comedy-focused works.

* There was a theory going around for a while that the Babylonians built Emerl, due to the text calling the awakened Gizoid a god at one point, and the legend stating that Babylon was destroyed by an angry god for their hubris. Naturally, ''[[VideoGame/SonicChronicles Chronicles]]'' laid this one to rest... [[CanonDiscontinuity at least before the game was rendered non-canon]] due to legal issues.
* ''VideoGame/SonicTheHedgehog2006'' created a bit of a ContinuitySnarl with Blaze the Cat; in ''VideoGame/SonicRush'' (her introduction) she was supposedly from another universe, while in ''2006,'' she was from the future. However, in the end of ''2006,'' she was sealed in another dimension. While ''2006'' ended with a ResetButton, fans attempted to reconcile the two plot lines by stating that the dimension Blaze sealed herself in was the one from ''Rush''. ''Rush Adventure'', which was released after ''[='06=]'', josses this theory, as it's stated that Blaze belongs to a royal family that has existed in that dimension for generations. [[WordOfGod According to Iizuka at Summer Boom 2012]], Blaze is indeed from the Sol Dimension (as seen in ''Rush''), although that doesn't quite explain why she's in Crisis City in ''[[VideoGame/SonicGenerations Generations]]'' with the implications that she remembers being at Crisis City (unless you want to HandWave it as a MythologyGag [[ResetButton of sorts]]). Creator/ShiroMaekawa (the game's writer)[[https://twitter.com/mizuhano/status/1010563445068976128 did imply]] though that the idea of Blaze sealing herself into the Sol Dimension and having ''06'' connect to ''Rush'' was his original intent, even if [[GodDoesNotOwnThisWorld SEGA's decree holds priority over his own]].

* According to fans, Maria Robotnik died in the 1950s or early 1960s. This is despite the games [[AmbiguousTimePeriod having no stated time period]]. They don't ''look'' very futuristic, so fans assume they take place contemporary with their releases. Maria's clothes and the general atmosphere of the flashbacks seems to allude to the mid-1900s as well. If we're going by ''Anime/SonicX'', however, Maria actually died in the 21st century (Gerald's diary is dated to "20XX").

* Tails is usually depicted and referred to in fan-works as either having red, orange, or yellow fur (or a mix of those, like yellow-orange). According to ''Adventure 2'' at least, his fur is "[[HairColorDissonance fox]] ''[[HairColorDissonance brown]]''". Later games and media, however, do consistently refer to his color as yellow... [[HairColorDissonance Even if he actually looks reddish or orange]].

* The heights of Sonic and the other characters. While the Sonic channel lists Sonic's height as 3'3 or 100 cm, a lot of games are pretty [[YourSizeMayVary inconsistent]] in Sonic's size. Most infamously are the ''VideoGame/MarioAndSonicAtTheOlympicGames'' which has Mario[[note]]His height is 5'1 according to his life size statue.[[/note]] and Sonic at the same height. A common fanon for Sonic's height is his classic version being 3'3 and Modern Sonic being 5'1, with the other characters' modern design's height being added or subtracted with the same number difference from Sonic's height on the Sonic Channel.

* The ''WesternAnimation/SonicBoom'' incarnations of the characters as older than their mainstream versions. Fans aren't concrete on Sonic and Knuckles' ages, however Amy is seen as a teenager and Tails is seen as being at least ten years old. This is due to their more mature looking designs and older seeming personalities. WordOfGod is that they're the same age as their normal incarnations (ie, Amy is twelve and Tails is eight).

* While ''Sonic'' games aren't particularly known for having great continuity, one persistent fan theory would make Shadow, the series' resident [[MovesetClone Sonic clone]], ''literally'' a copy of (Super) Sonic, despite having been genetically engineered fifty years before the series began. In ''Sonic & Knuckles'', Sonic faces off against... well, ''Knuckles'' in the Hidden Palace Zone, a secret holding place for the Master Emerald. In the background of the battle is a mural that depicts a glowing, hedgehog-shaped thing flying and fighting a giant robot over an Emerald in what is {{Foreshadowing}} for the last level, in fact a prophecy created thousands of years earlier by the ancient Echidna civilization. Later in ''VideoGame/SonicBattle'', reading the diary of Professor Gerald, Shadow's creator, shows that the man has spent a great deal of time researching the very same Echidnas that made the above mural. This is insignificant on its own, until one considers that Shadow resembled Super Sonic much more than he resembles Sonic; both hover above the ground in place of running, both have tussled, unkempt-looking spines, both have red eyes, both are immortal (though in different ways), and both possess extraordinary control over the Chaos Emeralds. Although the implications of Sonic being a warrior of prophecy and Shadow being a copy of him via that prophecy could easily become one of the deepest aspects of the entire plot, it unfortunately doesn't seem like it will be capitalized on.
** Another version of this theory is that Sonic was born the original Ultimate Lifeform while Shadow was just Gerald's attempt. Shadow himself suggests this in ''VideoGame/SonicAdventure2'' if the final battle goes on long enough and the player is controlling Sonic at the right time.
** Other suggestions based on the above are that Professor Gerald was not trying to ''copy'' history; rather he believed the mural was indeed of a warrior of prophecy and in his arrogance thought ''he'' could fulfil the prophecy, which was why he created Shadow in the image of Super Sonic, and a hedgehog. Justified in that Gerald wasn't the sanest of individuals even before he went crazy - and he did originally want Shadow to be a protector for Earth.

* ''VideoGame/SonicTheHedgehog2006'' created a bit of a ContinuitySnarl with Blaze the Cat; in ''VideoGame/SonicRush'' (her introduction) she was supposedly from another universe, while in ''2006,'' she was from the future. However, in the end of ''2006,'' she was sealed in another dimension. While ''2006'' ended with a ResetButton, fans attempted to reconcile the two plot lines by stating that the dimension Blaze sealed herself in was the one from ''Rush''. ''Rush Adventure'', which was released after ''[='06=]'', josses this theory, as it's stated that Blaze belongs to a royal family that has existed in that dimension for generations. [[WordOfGod According to Iizuka at Summer Boom 2012]], Blaze is indeed from the Sol Dimension (as seen in ''Rush''), although that doesn't quite explain why she's in Crisis City in ''[[VideoGame/SonicGenerations Generations]]'' with the implications that she remembers being at Crisis City (unless you want to HandWave it as a MythologyGag [[ResetButton of sorts]]). Creator/ShiroMaekawa (the game's writer) did [[https://mobile.twitter.com/mizuhano/status/1010563445068976128 imply]] though that the idea of Blaze sealing herself into the Sol Dimension and having ''06'' connect to ''Rush'' was his original intent, even if [[GodDoesNotOwnThisWorld SEGA’s decree holds priority over his own]].

* The fandom has been very slow on the intake that the games don't take place on a planet called "Mobius" that is populated by {{Funny Animal}}s. They take place on a planet that is officially either "Earth" or "Sonic's World". Said planet [[LionsAndTigersAndHumansOhMy prominently features humans alongside talking animals]]. In fanworks, you'll typically see Sonic's planet be referred to as "Mobius" (even in ones that otherwise follow game canon). In order to make Sonic's world sound more fantastic, it's named "Mobius" rather than just "Earth". A large reason for this confusion is due to the popularity of the ''ComicBook/SonicTheHedgehogArchieComics'' comic, which, prior to the ContinuityReboot, did take place on Mobius. Many adaptations such as ''Anime/SonicX'' and ''WesternAnimation/SonicBoom'' also have Sonic living on a WorldOfFunnyAnimals, which strengthens the belief.

* It's often mentioned in fan-works (especially Shadow/Maria or Sonic/Elise ones) that, while human/FunnyAnimal relationships are not illegal, [[BestialityIsDepraved they are looked down upon by both species]].

* Everybody knows Sonic's hydrophobic... except he ''isn't;'' he has a normal fear of drowning considering he can't swim. Sonic's "hydrophobia" is only shown in one episode of ''WesternAnimation/SonicUnderground'', has been expanded to a few episodes of ''Anime/SonicX'' where he wouldn't even go to the seaside when he had a choice (while quite a few ''[=SegaSonic=]'' sources even say he loves the seaside), and popped up in ''WesternAnimation/SonicBoom''. To be fair, after [[ThatOneLevel Labyrinth Zone]], we wouldn't be surprised if it ''made'' him hydrophobic.
* Thanks to ''Sonic and the Black Knight'' having Shadow as Lancelot and Silver as Galahad, many fans considered the similarities between the two (certain abilities, personality traits, species and CHEST HAIR) and the fact that Shadow is immortal while Silver is from the future, and decided that Shadow is who Sonic Team has in mind as Silver's eventual father. Other evidence cited includes: A major point made is that [[Myth/KingArthur the Round Table]] had lots of good, strong and famous knights, and Silver, not being a part of the story itself, could have been any one of them, but Sonic Team chose ''Galahad'', son of Lancelot and said to be the most righteous knight of all. And they get a special winning animation in [[VideoGame/MarioAndSonicAtTheOlympicGames the Sochi Olympic Games]] too, which is intended for characters with some kind of relationship. There's a lot of father-son feeling in theirs, with Shadow looking sideways at Silver, and Silver trying to copy Shadow and look tough, when most of his winning poses have him floating around like a kid. Silver is an expy of [[Franchise/DragonBall Trunks]] and Shadow is often compared with Vegeta due to being TheRival of Sonic, who were father and son. This has since been {{Jossed}} by Sonic Team head Takashi Iizuka [[https://pbs.twimg.com/media/CfsvytRUYAAsPxE?format=jpg&name=small when asked about it on his Facebook page,]] but fans continue to interpret them as such anyway.

* Bean and Bark as villains is this. Their official bios don't imply they're villainous at all and it's implied they're friends of Sonic in the official backstory to ''Sonic the Fighters''. However Bean's mischievous nature and bomb affinity, and Bark's imposing design and stern expression made fans believe they were. This isn't helped by the bios being Japanese-only. Sometimes they are an outright TerribleTrio with Fang. It was eventually made AscendedFanon in the ''ComicBook/SonicTheHedgehogArchieComics'' series, a cameo in ''VideoGame/SonicGenerations'', and being mimicked together in Heavy Magician's battle in ''VideoGame/SonicMania''.
* The default [[https://vignette.wikia.nocookie.net/sonic/images/b/b9/SF_STEAM_MANUAL_EN_LRv5-3.png/revision/latest?cb=20171108085827 wolf Avatar]] from ''Sonic Forces'' who is used in most of the game's promotional material has been nicknamed "Gadget the Wolf" by the fandom despite only ever being called "buddy" or "rookie" in-game. He is universally used in fanart to portray the Avatar consistently, instead of having a different appearance every time.
* Infinite pre-Phantom Ruby is often called "Zero", based on a name used in some of his concept art. On the ''Podcast/BumbleKast'', Ian Flynn stated Infinite is his birthname, but that won't stop fans.
* Sonic is sixteen as of ''VideoGame/SonicGenerations''. This also explains the deeper voice of Sonic's post-''Colors'' English voice actor. Sega, however, treats the game as an AgelessBirthdayEpisode and thus [[NotAllowedToGrowUp Sonic is still fifteen]]...until that was quietly removed by Sega in favor of a VagueAge in 2022.

* Tails is assumed to be an orphan. Alternative, he was abandoned by his parents for having two tails (this takes some inspiration from ''[=AoStH=]'').

** Adult Cream is almost always [[StrongFamilyResemblance indistinguishable from Vanilla]] in fanworks.

* Chaos, the water god-like being, will be used [[OhMyGods in place of God in some expressions]] in some fanworks, such as "Oh my Chaos!" Other gods, such as Light Gaia, may be used, but Chaos is rather the most common.
* In fan-art depicting [[HumanityEnsues the characters as human]], there are a few frequent elements: Tails will wear {{goggles|DoNothing}}, Sonic will have ShonenHair, and Knuckles in earlier days of the fandom was depicted to be a white LongHairedPrettyBoy. However, the racist assumption that he would be white was caught on as years passed, and Knuckles nowadays is usually drawn as a darker-skinned DreadlockWarrior (which ''does'' have basis in Knuckles [[WhatCouldHaveBeen originally being conceived as a more overtly black-coded character]]).

** Many {{Fan Work}}s like to make Blaze dark-skinned due to her bindi, which is caracteristic of South Asian cultures. It helps that some of her concept artworks had her even more Arabian/Indian-inspired than her final look ended up being.

* Amy Rose will have a {{Flower Motif|s}} concerning roses ([[MeaningfulName her last name, duh]]) and rose metaphors will be common in fanworks focused on Amy.

* Canonically, Sonic's full name is "Sonic the Hedgehog", however many fanworks tend to have his full name be Sonic "Needlemouse" instead.[[note]]Needlemouse comes from Mr Needlemouse, an infamous mistranslation that is derived from an incredibly early concept design of Sonic referred to as Mr. ハリネズミ, or Mr. Hedgehog if correctly translated.[[/note]]
* Whenever the female {{Funny Animal}}s are shown with midriff-baring outfits in the games, their stomachs tend to be of the same fur color as the rest of their bodies, as opposed to being the same color as their muzzles like with male characters such as Sonic and Tails. Fan artists, however, generally prefer to use the latter style when depicting the gals in more revealing outfits, or as [[AccessoryWearingCartoonAnimal Accessory-Wearing Cartoon Animals]] in the same vein as Sally Acorn and the guys in general (if not for ''[[Rule34 other]]'' purposes). In Amy's case, it has become a trend to give her a heart-shaped, peach-colored patch of fur ([[FurIsSkin or skin]]) on her exposed chest when appearing unclothed, usually to better emphasize her characterization as a LoveFreak and make her a true DistaffCounterpart to Sonic.

* Whether it's OVA-related, a fan redesign, or an AU fan comic, Knuckles' fedora from the OVA tends to make a reappearance in different fan works. The hat's reappearance in ''VideoGame/SonicDash'' and ''VideoGame/SonicForcesSpeedBattle'' added fuel to this fire.
* Fan art commonly depicts Blaze as being aquaphobic - to an even greater extent than Sonic - [[CatsHateWater by virtue of being a cat]]. This is in addition to her ''canon'' fear of heights, as seen in ''VideoGame/SonicRush''.
* Thanks to the discovery of one [[https://64.media.tumblr.com/24ff9800e89c08e1f842312e1e8b835c/9ff451dbddc3a1c5-55/s500x750/920ede0337758f8582eb1cae6bd980539a0e02ac.png piece of official art miscoloring Tails' shoes as blue]] in 2020, it has become common in more recent fanworks to depict Tails as wearing blue shoes instead of his canon red ones, due to fans feeling that blue better compliments his orange/yellow fur than red does.
* While Classic Super Sonic is canonically depicted to have the same black eyes as his normal form, it’s not uncommon to see him portrayed as having green eyes in fanworks instead, largely due to his in-game sprite from ''VideoGame/Sonic3AndKnuckles'' depicting him with them. Some even use the idea of him gaining green eyes after turning Super as an InUniverse explanation as to why [[NotQuiteBackToNormal Sonic had suddenly gained green eyes in his later appearances]].

* Shadow liking ''Anime/KillLaKill'' is a somewhat common idea amongst fans due to how similar Shadow and Ryuko are. Funnily enough, this has become AscendedFanon via the Twitter takeovers.

* While not supported by any canon material, a common theory as to why Sonic couldn't do the spin-dash in the first game is that he was somehow injured and crippled by Eggman prior to the game's events.

* A fair amount of the fanbase believe that Maria spent a significant amount of time weakened or even bedridden by her disease, with Shadow often doing his best to make her feel better in either heartwarming or hilarious fashion.
* From the tail end of the 2010s and beginning of the 2020s, Shadow has somewhat shifted away from a try-hard edgelord to a more genuine weirdo who just happens to like things that are considered edgy. This mainly came from the Twitter Takeovers, which include gems such as Shadow liking to eat coffee beans (because he doesn't want coffee flavoured water), wanting to open up an orphanage for all the kittens of the world, and being a Music/TaylorSwift fan. Naturally, no matter how odd his behaviour ends up being he'll always treat it with [[TheComicallySerious utmost seriousness]], usually to the confusion of those around him. [[AscendedFanon This interpretation of Shadow is somewhat canonized]] through ''VisualNovel/TheMurderOfSonicTheHedgehog'', a visual novel written by the same social media team that wrote the Twitter Takeovers and have a few [[MythologyGag references]] to them.

* ''WesternAnimation/SonicUnderground''

* From the tail end of the 2010s and beginning of the 2020s, Shadow has somewhat shifted away from a try-hard edgelord to a more genuine weirdo who just happens to like things that are considered edgy. This mainly came from the Twitter Takeovers, which include gems such as Shadow liking to eat coffee beans (because he doesn't want coffee flavoured water), wanting to open up an orphanage for all the kittens of the world, and being a Music/TaylorSwift fan. Naturally, no matter how odd his behaviour ends up being he'll always treat it with [[TheComicallySerious utmost seriousness]], usually to the confusion of those around him. [[AscendedFanon This interpretation of Shadow is somewhat canonized]] through ''VideoGame/TheMurderOfSonicTheHedgehog'', a visual novel written by the same social media team that wrote the Twitter Takeovers and have a few [[MythologyGag references]] to them.

* Sonic is sixteen as of ''VideoGame/SonicGenerations''. This also explains the deeper voice of Sonic's post-''Colors'' English voice actor. Sega, however, treats the game as an AgelessBirthdayEpisode and thus [[NotAllowedToGrowUp Sonic is still fifteen]].

* Maria Robotnik was a ChildProdigy. This is due to her being from a family of super-geniuses, so fans believe it runs in the family.

* If Maria Robotnik was revived, she'd be [[AdaptationSpeciesChange a yellow-furred hedgehog]]. This is due to a commonplace fan design for "Maria the Hedgehog".

* ''WesternAnimation/SonicUnderground'': Sonia and Manic don't have known eye colors. In fan works, they're almost always given blue and brown eyes.

* It's often mentioned in fan-works (especially Shadow/Maria or Sonic/Elise ones) that, while human/FunnyAnimal relationships are not illegal, [[BestialityIsDepraved they are looked down upon by both species]].

* Prior to ''VideoGame/ShadowTheHedgehog'' possibly retconning this, some have interpreted that in ''VideoGame/SonicAdventure2'' GUN was working independently of the President of the United Federation, and that Rouge specifically only answered to the President as opposed to both. This is often used to explain why the President tasked her to clandestinely collect data on Eggman and Project Shadow ''from'' GUN or the ARK, along with why GUN still antagonized her just as tenaciously as they did all the other heroes and villains of the story.

* ''WesternAnimation/SonicUnderground''
** While the identity of Queen Aleena's husband, the ''true'' King of Mobius, remains a mystery in the show, many fans speculate that it could be a version of Jules Hedgehog from the Archie comics.

* If Amy is emigrated into ''WesternAnimation/SonicUnderground'' fanon, she is crowned Sonic's queen consort and rules Mobius with him (despite it being heavily implied in the show that all three triplets were to be ruling together even though by virtue of Sonic being the eldest ''he'' is to wear the Crown). In addition, their children (normally the firstborn of them) are heirs to the kingdom. She is also sometimes even made the fourth member of the band too, with her own medallion(s) and instrument to play in the musical numbers (usually a bass guitar or a piano similar to Sonia's). In addition, while queen consorts ''on Earth'' have little to no power per se (even when their position is constitutionally or statutorily recognized), Amy would at least be afforded ''some'' of the powers that Sonic would have as King.