* AscendedFanon: The [[https://twitter.com/sonic_hedgehog/status/712326170121883648 official]] ''Sonic the Hedgehog'' Twitter used the FanNickname "Dark Sonic".
* ActingForTwo: Cream and her mother Vanilla are both voiced by Creator/SayakaAoki in Japanese.
* AdoredByTheNetwork: For ''whatever'' reason, ''Sonic X'' seems to be loved by pretty much ''any'' SaturdayMorningCartoon block there is. When it first debuted on the [[Creator/FoxKids Fox Box]], it quickly became the most advertised show on the block and continued to be loved even after it switched to ''the CW 4kids'' and ''then'' to ''Creator/{{Toonzai}}'' and '''''then''''' when it became ''Creator/{{Vortexx}}''. If that isn't enough, ''Creator/KidsClick'', an attempted revival of the ''Creator/KidsWB'' format already plans to start reairing the show in ''2017''. Keep in mind this was an anime that ''ended'' in '''''2004'''''.
* AnimeFirst: Unlike other anime that were made before a manga adaptation for it was announced, the anime didn't get a manga adaptation after it premiered. But it did receive a comic book adaptation by Archie Comics after it premiered.
* CrossDressingVoices: Played straight where Creator/MikePollock, who also plays Eggman, voices Ella in the English dub, but averted in the original Japanese version where she is voiced by Creator/{{Kujira}}.
* DevelopmentGag: The anime contains dialogue and scenes from ''Adventure'' and ''Adventure 2'' that were removed from the initial releases of the games.
* ExiledFromContinuity: Due to Sega's bias against past ''Sonic'' media, characters and elements from ''Sonic X'' are generally forbidden from being used in current incarnations of the franchise. However, Shadow's Inhibitor Rings were used in ''[[VideoGame/SonicTheHedgehog2006 Sonic 06]]'' and the [[ComicBook/ArchieComicsSonicTheHedgehog Archie comics]]. In addition, the Blue Typhoon's Sonic Power Cannon is a weapon on Sky Patrol. Likely due to Ian Flynn sneaking past mandates.
* FanNickname: Cosmo's species never really had a nickname until someone nicknamed them "Seedrians" for their plant like features.
* {{Feelies}}: The "Project: Shadow" DVD included a card from the ''Sonic X'' card game.
* KeepCirculatingTheTapes:
** The show aired reruns for a ''long'' time. Despite this, according to Ian Flynn, {{Creator/Sega}} [[ExecutiveMeddling apparently doesn't want]] [[ComicBook/SonicX the comics based on the show]] [[ExecutiveMeddling to be reprinted]], if some sources are to be believed.
** The show may have stayed alive through television reruns, but when it came to DVD releases, there was only incomplete releases from 4kids and Funimation until Creator/DiscotekMedia decided to license the show for a DVD release. Even still, Discotek currently only has plans for releasing the 4Kids dub [[note]]This is due to 4Kids themselves not supplying the scripts for the subtitled version that was streamed on Hulu, meaning that a sub-only (or even a re-dub based on the Japanese subs) release would require ''a complete recreation from scratch''[[/note]], meaning those who are hoping for an uncut release are out of luck, or at least will have to wait until Discotek decides to put out such a release, or until they give the license to someone else, like Website/{{Crunchyroll}}.
* NoExportForYou: Inverted? The last season only aired ''outside'' Japan, despite a full Japanese voice track being produced.
* TheOtherDarrin:
** Unlike the games in 2003, the Anime featured different voice actors from the Creator/FourKidsEntertainment line up such as Creator/JasonGriffith as Sonic and Shadow, Amy Palant as Tails, Creator/DanGreen as Knuckles, Creator/LisaOrtiz as Amy, and Creator/MikePollock as Dr Eggman. They would later replace the game voices as the official voice cast until 2010, when all but Mike Pollock would be replaced with the current voice cast.
** While most of the Japanese voice actors were retained from the games series, Creator/JojiNakata, however, did not reprise his role as E-102 Gamma (despite providing the voice work for Dark Oak in the third season of the anime). Instead Naoki Imamura (who voices E-123 Omega in the games) took the role.
** After Creator/ShunYashiro's death that same year the anime began airing, Creator/TakashiNagasako began taking over as Big the Cat in the anime and in the games.
** Tails on the other hand was originally voiced by Kazuki Hayashi in Videogame/SonicAdventure and Atsuki Murata in Videogame/SonicShuffle and Videogame/SonicAdventure2, but is now voiced by Creator/RyoHirohashi in the anime and in the games.
** Pachacamac was originally voiced by Creator/ToruOkawa in Videogame/SonicAdventure, but is now voiced by Toshihiko Nakajima in the anime.
* RelationshipVoiceActor:
** [[Creator/SanaeKobayashi Chris]] and [[Creator/KojiYusa Shadow]] are [[Anime/YuGiOhGX Alexis and Atticus]], [[Anime/ErgoProxy Daedelus and Vincent]] and [[Manga/{{Karneval}} Mine and Tsukitachi]].
** [[Creator/JunichiKanemaru Sonic]] and [[Creator/BinShimada Chuck]] are [[Anime/FutureGPXCyberFormula racers in Cyber Formula racing]].
* SheAlsoDid:
** Chris's English voice actress, Creator/SuzanneGoldish, would also go on to direct a few anime dubs with the L.A-based Creator/{{Studiopolis}} [[note]]as well as serving as an engineer where the Sonic games are currently recorded[[/note]], including ''Manga/{{Bleach}}'' (episodes 268-366), ''Anime/{{K}}'', ''Anime/TigerAndBunny'' and ''Manga/SailorMoon'' (2014 re-dub).
** Chris' Japanese voice actress, Creator/SanaeKobayashi, would also play Allen Walker in Manga/DGrayMan, a manga in which Creator/TMSEntertainment would later adapt into an anime.
* TalkingToHimself: In Spain, Rafael Alonso Naranjo Jr. was Sonic and Vector.
** In English speaking territories, Jason Adam Griffith voiced both Sonic and Shadow.
* WhatCouldHaveBeen:
** ''Sonic X'' originally looked like [[http://www.youtube.com/watch?v=L7AqlIp5evA this]]. Scenes from that short were used in the American intro. It originally took place on a WorldOfFunnyAnimals much like most previous adaptations. Instead, they opted for a HumanFocusedAdaptation twist mixed with a TruerToTheText one: (unlike in the games) Sonic come from another dimension, however he and his friends end up on Earth at the start. This means they could adapt ''Adventure'' and ''Adventure 2'' plots, which heavily involve humans.
** While not too different from the how the show actually turned out, there were a few elements that were definitely scrapped or changed from [[http://www.youtube.com/watch?v=7L7ti-tw8rod the second pilot]].
** One of the most (in)famous examples is "Nazo", a name given to a seemingly unknown Super form or character shown in one of the trailers. The name stems from the image name from the official website "Nazo.jpg". Iizuka's word is that [[http://www.tssznews.com/2015/09/22/takashi-iizuka-nazo-is-super-sonic/ it was just an early design for Super Sonic]], which means he would have looked very differently from the games, having a silver coat and different quills. However, the fact that Super Sonic's regular design is also shown in said trailer casts doubt on this.
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