* AccidentalInnuendo: In the original, Edo (having the D-Hero deck), often says things like "the power of the D" or similar in reference to destiny. When "the D" is taken to be the OTHER one, some really hilarious accidents occur.
* AmericansHateTingle:
** Yubel gets shunted off to the side a lot in the English-speaking fandom, but she (and her relationship with Juudai) appear fairly popular in Japanese fan art. Part of this is likely because her motivation was degraded from a sadomasochistic view of love to just being a PsychopathicManchild.
** The GX anime in general was a lot better received in Japan than in English-speaking fandom, especially when it was first airing.
* AntiClimaxBoss: [[spoiler:Despite having a very powerful deck, Darkness has a rather poor showing against Judai in his final duel with him.]]
* AwesomeMusic: The dub's guitar soundtrack.
* AssPull:
** In true series tradition. Judai's deck focuses on Fusion, so count on him constantly fusing his E-Heroes in different ways never seen before, and the new one will do exactly what is needed to do to help him win. Not to mention all the E-Hero support cards that are just completely useless in real life due to how situational they are, but in the show Judai pulls them out in instances that always let him win.
** Ryo's initial Deck focused on a single monster and its Fusions, summoning Cyber End Dragon again and again. Getting the same results in a real-life Deck would take incredible luck.
* AuthorsSavingThrow: Season 3 gave most of Judai's friends fairly unflattering treatment, with most either becoming a Duel Zombie in the first alternate dimension or "dying" in the second, while [[CreatorsPet Johan]] received so much attention even when he wasn't around. Season 4 gave many of them more development and established their goals in life, while Johan is shipped off back to his own school for most of the season.
* BadassDecay: Manjoume in Season 3.
** Misawa in the second season.
* BaseBreaker: Johan. The fans seem to be divided on whether he's the [[EnsembleDarkhorse best character in the entire show]] who deserves his own spin-off or a bland, spotlight-stealing GaryStu, with not much middle ground.
* BigLippedAlligatorMoment: In episode 20, while Judai, Sho, and Hayato are scrubbing each other's backs, [[https://24.media.tumblr.com/05f0eec3d86e2f5d6b150e6b07dc92fa/tumblr_n49j43vtkE1s9gsu0o4_500.png Judai would then realize that he's scrubbing a bear's back]] while the bear scrubs a seal. That hilarious incident was never mentioned since, and it was also cut from the dub due to partial nudity.
* BrokenBase: Yubel being PutOnABus for most of Season 4, people say good riddance to her, others want to explore her and Jaden's relationship with each other more.
** Jaden's new personality in Season 4. Is his new attitude too dark and unpleasant, and inferior to his big-hearted and energetic personality from before? Or did it make him much more impressive and provide a lot of character development.
** Season 4 not being dubbed ''at all'' is still a sore topic for the English-speaking fans of the show.
** Season 4 in general. Either the best season of GX (or of YGO in general), or the worst.
** The series itself. Fans of it cited the DeconstructorFleet and AffectionateParody route it took, well-rounded characters and a tone that progressively got DarkerAndEdgier. Detractors cited the poor pacing, [[TheyWastedAPerfectlyGoodPlot rushed storylines]], large Filler at the beginning (the first major antagonist only made an appearance at episode ''29''), [[TheyWastedAPerfectlyGoodCharacter under]][[PutOnABus used]] [[SpotlightStealingSquad cast]], [[BrokenBase controversial season 4]] and duels that heavily relies on AssPull and TheMagicPokerEquation. The last argument is usually brought up and the only one that even its fans have to admit is detracting from the show.
* CanonSue: Whether you like him or not, it's hard to deny Johan fits this trope. He is introduced suddenly and immediately becomes Judai's best buddy, he has a near-perfect onscreen record and his only loss is essentially [[WorfHadTheFlu because he didn't have his dragon]], Pegasus regards him as the 5th best duelist that he's ever seen after Yugi, Kaiba, Jounouchi and Edo (whose skill we'd actually seen beforehand), he has special powers that he can use better than anyone else, his Duel Monster spirits are far more interactive than anyone else's (even Judai's generally only display personalities when it's actually important, while Johan's can speak and emote at all times), he has few (if any) flaws, everybody likes him, and he receives tons and tons of focus, even when he's not onscreen, taking precedence over basically every established character.
* CompleteMonster: Brron, Mad King of Dark World, is demented and {{sadist}}ic, ruling the [[AnotherDimension Spirit World]] as its vile dictator and being responsible for its deplorable state and the oppression of its denizens. His [[TheDragon right-hand man]], Zure, oversaw Brron's will, detaining anyone who defied him in internment camps while killing duelists who could be threats to him. The executions occurred at his fortress and involved releasing monsters at disarmed duelists while Brron himself and his minions watched the spectacle. After learning of Jaden's presence in his domain, Brron orchestrated a plot that involved turning Jaden evil by sacrificing all of his friends one by one with his set of "Wicked Doctrine" cards to create the "Super Fusion" card. After his defeat, Brron, before dying, mocked Jaden by saying that he would never see his friends again before dying.
* DieForOurShip: Asuka is subjected to this from some shippers who pair Judai, her canonical crush, with anyone other than her (aforementioned "some shippers" are often {{Yaoi Fangirl}}s).
* DracoInLeatherPants: Hell Kaiser.
* EnsembleDarkhorse: Daitokuji-sensei appears to have a small following.
* EvilIsSexy:
** Hell Kaiser Ryo, Possessed Johan, Darkness Fubuki. The Supreme King.
** The ladies have less to offer, but there's still Yubel and the Seven Star Camula.
* EpilepticTrees: Since quite a lot of things were hinted at but never filled in, this should come as no surprise.
* FauxSymbolism: All three Sacred Beasts are named after Judeo-Christian angels.
* FriendlyFandoms: ''5Ds'' and ''GX'' fans typically like each other a lot more then they would like ''Zexal'' and the original series fans, largely due to how they had entire seasons not dubbed by 4Kids. It's also likely because the people who quit after ''DM'' probably didn't get back in with ''5Ds'', while people who stuck through ''GX'' probably stuck through ''5Ds'' as well.
* FunnyAneurysmMoment: Remember the fun Juudai and the gang had about Sho's card crush on [[DarkMagicalGirl Dark Magician Girl]]? Flip it around, add in StalkerWithACrush tendencies, and throw in a pinch of NightmareFuel, and you have the premise for Season 3.
* GeniusBonus:
** For those attentive enough, the series is full of references to alchemy and tarot, including a {{Foreshadowing}} to the antagonist of the final season.
** The duel in Episodes 153-155 appears to have been structured to mirror or strongly resemble a Jewish wedding, beginning with Magic Chronicle as Yubel's dowry and the ketubah (Jewish wedding contract) and ending with a "cracked glass" when Juudai manages to take back Super Fusion and [[spoiler: join his soul to Yubel's]], something he reveals only after the worlds start shaking apart and the window in Samejima's office cracks and shatters. With the exception of a couple of Juudai's more convoluted turns, it's actually possible to trace every single turn back to the ceremony, in perfect sequence. The resemblance even continues after the duel--in a Jewish ceremony, the ceremony is complete when the bride and groom retire together, away from the guests (represented in this case by Sho and Ojama Yellow). The German dub even adds a touch of its own, with Syrus commenting that "[Jaden] and Yubel are united among the stars".
* GettingCrapPastTheRadar: In the dub, Atticus attempts to get Alexis to form a singing duo with him, and suggests "Bro-bro and Sissy" for the group's name. He also happens to be wearing, at the time, a rather fabulous purple jacket covered in sequins and frills. Quoth Chazz, "[[AmbiguouslyGay So which one's he?]]"
* GrowingTheBeard: Season 3 for Judai's CharacterDevelopment, better pacing, and an overall darker tone.
* HilariousInHindsight: The [[TakehitoKoyasu voice actor]] for Takuma Saiou, the one who played Arcana Force XXI - The World in the GX cartoon, ended up voicing Dio Brando in the 2012 cartoon adaptation of ''Manga/JoJosBizarreAdventure''.
* InformedWrongness: A Season 1 episode features the one-shot character Mitsuo/Pierre, a gambler who uses cards that rely on coin tosses to trigger their effects, and uses Second Coin Toss to redo the toss if he fails to get the needed result. Asuka declares that the only reason he's winning the duel with her is that he relies on Second Coin Toss to win his coin throws and without it he would have lost them all, and proceeds to destroy it and then attack for the win when he gets his last toss wrong. We're supposed to see Mitsuo as a cheater and a coward, but his strategy is perfectly valid and worked very well. The only reason he lost is that he didn't use his monster's effect to try and inflict 1000 damage to Asuka, if he had done so and got it right, he would have just won in two turns.
* JerkassWoobie: Cobra. All he wanted was to reunite with his dead adopted son, and he would no longer have any reason to be an antagonist if he met his goal. Amon wanted to create an idealistic world, and though [[UtopiaJustifiesTheMeans he kills two people in the process]] ([[spoiler:Echo and Ed]]), the former willingly sacrificed herself and the latter started a duel to protect the former, knowing the consequences of losing. Both are [[NeverFoundtheBody presumably]] killed by the far less sympathetic Yubel.
** Camula may count, She's the [[LastOfHisKind Last]] of a race of Vampires that were wiped out hundreds of years ago by humans who attacked them unprovoked and she sealed herself in a coffin to survive and waited for eons to be freed. She seeks to restore her Race but she sacrifices The Souls of those she defeats in Duels to do so.
* LadyMondegreen: Oh 4Kids...their dub of episode 154 will forever haunt them. The filter voice they put on Yubel distorted her voice so oddly that, at one point, she ended up sounding like she dropped an [[http://www.youtube.com/watch?v=n4sDFMPmLWY F-bomb]] when she says ''fight''.
* LauncherOfAThousandShips: Judai. Also Asuka, being the only major, non-jailbait female protagonist. This is the guy who doesn't know [[ObliviousToLove what a fiancée is]], let alone know [[ChasteHero how to have sex]]. Ironically, Judai/Asuka lemons tend to be [[PornWithoutPlot exceptionally graphic]].
* MemeticBadass: A lot of jokes are made around a) how unnaturally good Jaden is at Duel Monsters, or b) How he, depending on the persona, had a really high death count. Generally, outsiders to the show might only know him as "the guy who killed all his friends."
* MemeticMutation:
** From the manga, Johan's '[[DissonantSerenity It]] [[BlatantLies was]] [[NightmareFuel a happy duel]]'.
** Taking innocuous or cute scenes and pictures of Jaden, then adding how he [[MoodWhiplash "killed millions"]] and other unspeakably bad deeds. Sometimes he's depicted as being ObliviouslyEvil with these.
** Chazz it up! Chazz it up! Chazz it up!
* MisaimedFandom:
** People mainly fail to realize that the show is an AffectionateParody of the original series, especially in the early seasons, and later heads into DeconstructorFleet.
** Asuka/Alexis was a {{Deconstruction}} of MsFanservice, she was annoyed by how people saw her as an attractive girl and wanted to be seen as a person and a duelist instead of just a pretty face. However, fans don't care for that -- haters bash her as being a slut due to her appearance and outfit, while others ignore her personality because it's counter-productive to {{Shipping}}.
* {{Moe}}: Rei, and her Maiden in Love monster from her first appearance.
* MoralEventHorizon:
** Zane Truesdale (Ryo Marufuji) in the second season crosses the line after donning his Dark Kaiser persona when he electrocutes and almost kills his little brother Syrus (Shou) in a duel, never giving a damn about doing that, only about winning.
** Amon when he sacrifices Echo and apparently kills Aster to obtain Exodia.
** Yubel at every attempt in the 3rd Season with Jaden.
* NightmareFuel:
** Yubel, period. Even creepier when the dub gave it the voice of a spoiled 5-year-old girl.
** Brron, who is...some kind of semi-human-only-not-really skeleton...thing.
** Titan's [[FateWorseThanDeath fate]] when he abuses the power of Shadow Games.
** Darkness, with his MindRape and GrimReaper-eque form.
** The Underground is less supernatural, but still incredibly disturbing.
* OneSceneWonder: For the dub. He may only have two episodes and is a minor character who never appears ago, but the usage of the original series themes and cards, the genuinely good duel he gave Jaden, and of course Marc Thompson's NarmCharm impersonation of Dan Green's voice acting, make Dimitri far more memorable than a lot of other characters with larger roles.
* ReplacementScrappy: Judai compared to Yami Yugi as the heroes of their respective series. Judai is pretty much as different a character from Yami Yugi as could be imagined; while Yami Yugi was stoic, serious, and intelligent, Judai is goofy, easy-going, and stupid. Factor in his E-Hero cards being Scrappies for fans of the dueling, and Judai was not very liked ([[AmericansHateTingle among Western audiences, anyway]]). Until ''[=ZeXal=]'' it was often joked Judai is the worst ''Yu-Gi-Oh'' protagonist.
* RootingForTheEmpire: Yeah, Chazz is technically the "bad guy" whenever he's dueling Jaden, but by God, so many people just want to see him come out on top for once!
* SuperlativeDub: Episode 18 and 19 with Dimitri, the copycat duelist. In the original Dimitri was just Dimitri and only decided he ''was'' Yugi towards the end of the duel, but in the dub Dimitri acts like he's Yugi all along. What ''really'' sells the episode though is the absolutely [[NarmCharm Narmtastic]] impersonation of Dan Green's Yami Yugi that Marc Thompson delivers, taking Green's LargeHam, cranking it up, and giving a few lighthearted jabs at his mannerisms and catchphrases. The dub also re-uses parts of the original dub soundtrack as further nostalgia fuel when Dimitri makes his moves.
** In season 2, the dub keeps Aster's father's fate a mystery until the final confrontation between Aster and his stepfather. In the original, Aster knows he's dead from the beginning, but in the dub he disappears the same night he was robbed of his best card, and Aster searches for him for the majority of the season. This ultimately ''adds'' to the horror when it's revealed his soul has been swallowed by D-HERO Plasma, and the [[NightmareFuel nightmarish sequence]] that results is completely unedited.
* TastesLikeDiabetes: Episode 20 with that Maiden in Love deck is absolutely sickening.
* TheyWastedAPerfectlyGoodCharacter: One of the more prominent issues with the series is that ultimately, Judai has to solve all the conflicts on his own. His friends will generally at best do nothing against the antagonists and at worst get worfed so Judai can beat the antagonist later.
* TheyWastedAPerfectlyGoodPlot:
** Johan is a ChosenOne, but of what? [[FridgeBrilliance Possibly of the Crystal Beasts...]]
** What was Yubel during the twenty episode absence after possessing Johan but before confronting Juudai?
** Rogue card designer with a counterfeit Egyptian God? The whole thing resolves in ''one episode''.
** What were [[spoiler: Judai and Yubel off doing after they fused?]] It's implied that Judai was gone for quite a while (enough for most people to think that he was gone for good), so what were they doing?
*** It's implied that they were going to [[spoiler:go and kick the Light of Destruction's ectoplasmic patuckus]], making this closer to OffscreenMomentOfAwesome given that it wasn't actually shown (probably because it didn't involve card games).
** While the concept wasn't really wasted, the history of the Sacred Beasts/Phantom Demons is not explored at all, such as how evil versions of the God Cards were created and how they got sealed under the island.
** It's mostly based on the video games but a lot of people would prefer if Rei used Lightsworns instead of her current deck considering how much better the deck is.
* UglyCute: The Ojamas.
* {{Woolseyism}}: Yes, the dub did manage a few.
** The "Bio Bands" and "Survival Duels" in the dub were known as ''"Death Belts"'' and ''"Disclosure (seems benign, until you realize it's a pun on the Japanese pronunciation of death) Duels''". (called Dis-Duels in ''Tag Force 2''). God knows why the faculty weren't tipped off to the true nature of Cobra's actions when he pitched the idea in that version.
** Banner's German accent.
** While the symbolism of the name is lost, it could be argued that Nightshroud is a more impressive name for a villain than simply "Darkness".
** The D, in the Japanese named "DD" for "Destiny Duelist". The dub established "The D" was an alias and gave him the proper name "Kyle Jables", take from Kyle Gass and Jack Black of ''Music/TenaciousD''.
** A bit of a mean one that nonetheless works -- the monkey duelist being trained by Kaiba Corp in Season 1 was named "Sal" in the Japanese version, meaning [[FunWithAcronyms "Super Animal Learning"]]. The dub renamed it "Wheeler", after one of Kaiba's favorite insults for Joey, "dueling monkey".