* AntiClimaxBoss: Once Shotaro and Philip got their act together, [[spoiler: Terror]] was surprisingly easy to beat in a straight fight, most likely due to the point of the Gaia Memory being to [[spoiler: terrify your opponents into a state of helplessness.]]
** [[spoiler:Make that Double/Accel worked together. Once Ryu drew the Terror Dragon off and beat it, Ryubee's combat effectiveness was drastically reduced (also notice the fact that Ryubee can only create those liquids when Terror Dragon stayed in his headdress).]]
** Unstoppable one-on-one. Easy when you work together. Not so much AntiClimaxBoss so much as [[FridgeBrilliance re-affirming the whole point of the entire series.]] [[spoiler:Utopia]] would be the exact same way.
** [[spoiler: Utopia]] as well. Despite defeating Accel and the Taboo Dopant with no effort, Double makes surprisingly short work against him. Justified in that his strongest ability, absorbing emotions to power himself up, [[TooSpicyForYogSothoth was used to overload him]].
*** He gets defeated again in a spin-off movie, though this time it's because his opponent is DeadToBeginWith and thus has no emotions to draw power from.
* SugarWiki/AwesomeMusic: Wailing Desperation, the then nameless OneWomanWail from the prologue of the first episode; it was really short, but having been presented at a crucial and dramatic moment, it left quite an impact.
** You can hear it again at the end of the first part of "The Girl...A", but with a more subdued and chilling arrangement as it accompanies an important Reveal.
** The series theme song, [[http://www.youtube.com/watch?v=VpnomDGCdyc W-Boiled Extreme]].
** Double's three Battle Themes, each with their own fitting style.
** "Glorious Street", the Heaven's Tornado song from episodes 7 and 8.
** Accel's Battle Theme, "Leave All Behind", based on his catchphrase.
** "[[http://www.youtube.com/watch?v=FhycohZyQ0s Nobody's Perfect]]", Kamen Rider Skull's theme; sung by the Chief himself, Koji Kikkawa, at the climax of "The B Carried on the Wind".
** And following that, an upbeating sound of a music as Double starts fighting against the Beast Dopant in his new SuperMode.
*** That same music plays again in Accel Trial's debut.
** "Extreme Dream" which wasn't used on the show until ''ten episodes after it was released.''
*** "Extreme Dream" is a very good example of how to properly use this trope. It was only played ''twice'' over the course of the series, both times during particularly climatic battles, rather then being spammed every fight scene after Double get's his SuperMode.
**** Same can be applied to "Leave All Behind", which was also used a total of two times.
** [[http://www.youtube.com/watch?v=GzLXyB5Lljs "Cyclone Effect (acoustic edit.)"]], which complements Episode 48 in a manner heartbreakingly perfect.
* BaseBreaker: The fandom's general opinion of Akiko earlier in the series. Very few people in the fandom took the middle ground, but both sides mellowed out over time.
* BigLippedAlligatorMoment: Shotaro fools Jinno into running away from an imaginary yeti at the end of "J's Labyrinth". It turns out there really is one, and Shotaro and Akiko faint.
** While this is more of an event in the ''Series/KamenRiderDecade'' movie ''All Riders vs. Dai-Shocker," no one should forget Double's debut himself [[spoiler:where he plastered [[Series/KamenRiderBlack Shadow Moon]] himself when the [[GameBreaker game-breaking]] Decade and Rising Ultimate Kuuga cannot]].
* BrokenBase: Arguably, the series ending. Some fans preferred the BittersweetEnding of #48 to serve as the series ending, whereas other fans liked the real ending (#49) as it was.
* CompleteMonster:
** Doctor Shinkuro Isaka, the Weather Dopant. He killed Terui's family, modifies Gaia Memories to kill their users so that he can take their power for himself, and is able to use Gaia Memories via direct insertion without any ill effects (typically, repeated use of Gaia Memories via direct insertion warps the user's mind, which shows that Isaka didn't have far to fall). He then tries to get Saeko to kill her own father and take control of the Museum, but winds up getting HoistByHisOwnPetard when all of the Gaia Memories he absorbed essentially destroy him from within upon Memory Break.
** From ''W Returns: Eternal'', we have Dr. Prospect aka the Eyes Dopant. This man took people from all over the world (their words implying they were kidnapped) to make them into, in his own words, "lab rats" for his Quark Project, giving them psychic powers. The fact that, when he arrives on the scene, every one these people with awesome PsychicPowers is ''quaking in fear of him'' shows how horrifically he must have treated them. That is ''nothing'' compared to his Heaven's Fall plan. This is a plan so horrible that the previously mentioned Utopia Dopant [[EvenEvilHasStandards considered it a brutal act!]] [[spoiler:He would blast the area with an electric pulse, killing anyone that has not lived up to his standards for the project, referring to it as "cleaning out the test pool".]] When Daido ruins that plan, he reveals that was merciful compared to what happens if they try to escape. [[spoiler:The eyes he implanted on them to watch them kill them when they leave his compound. As Katsumi is in shock over the slaughter of the village he'd tried to save, Dr. Prospect [[EvilLaugh is laughing his head off]] at the fact he'd just slaughtered a village of innocent people. His actions are so horrific that it [[DrivenToMadness drives Katsumi insane,]] a fact that serves as a valid FreudianExcuse for Katsumi's actions in the A-Z movie.]]
* DracoInLeatherPants: An InUniverse example. A whole V-Cinema is devoted to a girl from Kamen Rider Eternal's past popping out of nowhere and explaining to Shotaro and Phillip that Daido wasn't a bad guy and was just a FallenHero. Some people don't buy the tragic backstory.
** It's mitigated by the fact that Shotaro and Philip still point out that Eternal did a ''lot'' of bad stuff and hurt Fuuto badly. Their memorial to him comes off as bittersweet, thinking about what could have been for a man who became a monster but could have been a hero, given different circumstances.
* EarWorm: The sweet muted trumpet hooks in the OP "[[http://www.youtube.com/watch?v=yQqaQXIoczQ W-B-X ~Double-Boiled Extreme!~]]" (plus the rest of the song is really catchy). And the whole of "Finger on the Trigger". The catchiest {{Engrish}} ever. You have been warned.
** "[[http://www.youtube.com/watch?v=AKZaIhgr5c0 Love]]♡Wars" will dance its way into your head and never, ever leave.
* EnsembleDarkhorse: In short, this series is to ''Franchise/KamenRider'' what ''[[Series/SamuraiSentaiShinkenger Shinkenger]]'' is to ''Franchise/SuperSentai''.
** Specific examples from within the series include Kamen Rider Joker, Sokichi Narumi/Kamen Rider Skull, and Kirihiko.
*** Skull especially. His Figuarts is notorious for managing to find popularity with people who weren't fans of the franchise and fans who weren't collectors.
* EpilepticTrees: No, for once, it's not the "Female Riders, No Survivors" one. [[spoiler: A single picture of the [[Series/KamenRiderOOO Core Medals]] set off a wildfire, convincing people that Foundation X would be the next Shocker. Seriously. While it didn't get an expected pay off, one aspect of the foreshadowing, the "King Medal" does make it into the finale of OOO...]]
** [[spoiler: The much later appearance of Foundation X in Series/KamenRiderFourze would eventually confirm that Double, OOO and Fourze all do in fact take place within the same canon.]]
** Although [[spoiler: Akiko did henshin into Double with no ill effects...unless you count getting her face being sucked by the Utopia Dopant as the ill effect]].
*** She only henshined in a dream and it was to combat the Nightmare Dopant. Utopia Dopant came 17 episodes later and [[spoiler:sucked the faces off of pretty much everyone in Fuuto.]]
* EvilIsSexy: Saeko.
** Phillip never really turns evil to begin with, but in TheMovie [[http://morningglorydew.tumblr.com/post/10812679497/ikemenrider-philip-kamen-rider-w-never he winds up wearing NEVER's jacket for no apparent reason]]. Many fans thought he looked much sexier that way.
* FoeYay: Done to creepy lengths courtesy of [[CampGay Izumi]]/Luna Dopant in the movie ''A to Z - The Gaia Memories of Fate'', from his speech mannerisms to the way how he ''gyrates''.
--> '''Izumi[=/=]Luna Dopant''': *seeing [[Series/KamenRiderOOO the early bird cameo]]* Who's this handsome man? Just who's this handsome man?
* GameBreaker: '''[=CycloneJokerXtreme=]'''
* HeReallyCanAct: While Genki Sudo is known for MindScrew feints in between his sick moves in his MMA prime, you ''really'' don't expect the LargeHam ManlyGay we got in ''Forever A to Z''.
* HilariousInHindsight: While no crossover with ''Series/SamuraiSentaiShinkenger'' has been planned (unlike ''Series/KamenRiderDecade'' prior), two unintended parallels have surfaced - Memory Gadgets attach to Double's weapons while each carry one of the season's collectible items (the Gaia Memories much like the Shinkenmaru and Inroumaru with their Hiden Discs), and both Kirihiko and [[spoiler:Mako's father]] married ''into'' their respective families.
** Three now. [[spoiler:In ''Shinkenger'', it turned out that the real head of the Shiba family is a girl - fan reaction is mostly positive, but you let Akiko take charge of ONE detective agency, and out come the pitchforks...]]
** In Series/KamenRiderBlade, Hirose attempts to crack the BOARD database and eventually figures out the password: [[spoiler:"Double Joker"]].
*** Blade's BigBad is, in fact, [[spoiler:the Joker Undead]]. Not to mention that as Kamen Rider Chalice, he uses wind powers. Guess what Double's main form is called.
** '''Fang Joker''''s final attack is basically a high-powered, [[RuleOfCool impossibly awesome]] [[HurricaneKick spinning kick]] and has outstanding white colors. They might as well have called him [[MemeticBadass Spinzaku]] [[Anime/CodeGeass of the Counterattack]].
** Count in the battle between the red-themed Arms Dopant [[note]]see HeyItsThatGuy section on the main page[[/note]] and the white-and-black colored '''Fang Joker'''. Then remember a [[Series/BakuryuuSentaiAbaranger battle between two similar-colored warriors with the alignments inverted]].
** It's interesting to note that with Akiko using the Frog Pod to fake Ryu's voice, we essentially have [[Manga/KeroroGunsou a woman sounding like a man by way of a frog.]]
** [[Literature/ASeriesOfUnfortunateEvents Klaus Baudelaire]] had Gaia Library access before Philip did.[[note]]Better, even. Philip's way of accessing the Gaia Library can be likened to a PC with internet access - Klaus is ''his own server''.[[/note]]
** In one of the DVD shorts, Shotaro daydreams about what life would be like if Akiko were a [[spoiler:housewife]]. Flash forward to the announcement of ''Movie Wars Core''...
** Manipulating people through their greed and feeding on coins made by feeding off of them - was the Money Dopant the first [[Series/KamenRiderOOO Greeed]]?
*** And as an added bonus, the coins used to feed on the victims all have Gaia Memory USB connectors, resembling [[http://img225.imageshack.us/img225/1337/ooo279a.jpg actual merchandise released for OOO]].
** The Gaia Memory Enhancement Adapter in ''W Returns: Accel'' works on both Dopant and Riders' memories. In a nutshell, [[Film/CaptainAmericaTheFirstAvenger what is good becomes great, what is bad becomes worse.]]
** [[http://www.youtube.com/watch?v=pviarIHcuK4 Did Akiko's accent rub off on Queen?]]
** Pay attention in #30 when we enter Akiko's dreamworld. You can hear [[Series/KamenRiderFourze Gentaro's ringtone!]]
** WhatCouldHaveBeen would have had Double wearing a [[BadassLongcoat trenchcoat]] when Shotaro and Philip transformed. [[Series/KamenRiderWizard Three years later...]]
** Episodes 7 and 8 deal with [[Series/KamenRiderGaim street dancing]].
* HoYay: Shotaro Hidari & Philip. The fact they share a body when in Extreme (or when just being Kamen Rider W) might have helped, but these two have generated a fair amount of theories based on their behavior.
* JerkassWoobie: Did bad stuff happen to the [[spoiler:Puppeteer Dopant]]? Yes. Should you feel pity for the poor guy? Yes. Does that excuse any of the shit he pulls? ''No''.
* MemeticBadass: Sokichi Narumi, aka Kamen Rider Skull.
* MemeticMutation: The screencaps with two-colored text. "Fuck Nasca!" pictures are rather popular.
** '''XTREEEEEEEEEEEEEEEEEEEME!'''
** '''[[MostAnnoyingSound MAXIMUM DRIVE. MAXIMUM DRIVE. MAXIMUM DRIVE. MAXIMUM DRIVE. MAXIMUM DRIVE]]'''
* MoodWhiplash: Made the previous reigning king of this in the franchise, ''Series/KamenRiderKabuto'', look like an amateur effort. One example is how there would be serious scenes of Shotaro brooding over his mentor's death sandwiched between scenes of Akiko running around acting like a LooneyTunes character high on crystal meth.
* MoralEventHorizon: [[spoiler: If the powers of the Utopia Dopant don't convince you that Jun is a complete monster, then the fact that he went after Shotaro and Philip's friends and sucked their faces off will convince you to want to see Jun get his ass handed to]].
** The Spider Dopant [[spoiler:killing a multitude of people by spreading bombs which will kill the one their host loves the most when they touch all over the city, likely racking up the highest death count in the series.]] Narumi [[LampshadeHanging even tells him that he crossed the line with that action]].
** Commander [[spoiler:kidnapping Akiko with the intention to kill her in front of Terui to make Terui the copy of him. The fact she's an innocent person who has done ''nothing'' wrong is what makes him cross the line.]]
** Two words: "Heaven's Fall".
* SugarWiki/MostWonderfulSound: The henshin sound for the Xtreme transformation, which could almost belong in a VanityPlate.
* {{Narm}}: In [[Recap/KamenRiderDoubleEp31Ep32TheBCarriedOnTheWind The B Carried On The Wind]], when Shotaro and Philip were walking towards the Beast Dopant near the end, Philip falls down, as usual when they transformed. What makes it hilarious is that they tranform in a semi-slowmo fashion, with the music "Nobody's Perfect", sung by Koji Kikkawa, the actor who plays Sokichi Narumi, their boss, and Philip literally falls on his face...In slowmo.
** Even before that part, we got Terui being handed his behind on a platter. Slo-mo along the song. [[CrowningMomentOfFunny Pure gold]].
* NauseaFuel: Deliberately invoked with "Find the C"'s Cockroach Dopant, whose apparently decorative appendages sometimes flutter involuntarily like actual cockroaches.
* NightmareFuel: The Terror Dopant has the ability to make reality bleed the stuff.
** The ''Twin Maximum'' is this trope as written. "[[BrokenRecord Maximum Drive, Maximum Drive, Maximum Drive...]]" over and over again while Double writhes in pain, [[IncendiaryExponent on fire]], is just frightening. Philip was clearly against doing it for a good reason.
*** [[spoiler:The mantra returns during the final battle of "The B Carried on the Wind"...though the context is entirely different and makes it awesome]]..
** [[spoiler:Terror's Terror Dragon.]] [[http://static.tvtropes.org/pmwiki/pub/images/boo-terrordragon_8725.jpg See for yourself]].
** [[spoiler:Utopia]] [[FaceStealer wiping the faces of Philip's friends in Episode 48]].
** [[spoiler:Daido Katsumi going LaughingMad when all the psychics are killed...]]
** The way [[spoiler:Isaka]] dies after [[spoiler:Accel finally beats him in Trial form]]. Seriously, don't play the memory game, kids.
** The Utopia Dopant lights [[spoiler:Kamen Rider Accel]] on fire in Episode 47. As if that wasn't scary enough, [[spoiler:Ryu Terui]] screams in horror as he is burning to a crisp ''both in and out of'' [[spoiler:his rider form]].
** The Spider Dopant has the ability to implant spider bombs in people that make the people they love explode when they touch each other.
* NightmareRetardant: The possessed doll from "The P's Game" would be absolutely terrifying, if it didn't make squeeky noises whenever it moved.
* PainfulRhyme: "Finger on the Trigger" is filled with them, combined with GratuitousEnglish.
* SpecialEffectFailure: [[spoiler:Isaka]]'s defeat. You'd think that by now they've stopped getting sloppy with the enemies exploding.
** The movie has an example with all of Katsumi Daido's transformations. It's painfully obvious that he magically grows a foot whenever he becomes Eternal.
* ThisIsYourPremiseOnDrugs: The Delusion Diaries, little shorts of Shotaro having really bizarre daydreams. Entries include 'what if Akiko was a little sister' (featuring the cast as his family, complete with Ryu as a housewife and the Weather Dopant as his father), 'what if Akiko was an idol' (ending in [[GirlOnGirlIsHot Akiko marrying the Triceratops Dopant]]) and 'what will the agency be like in the future' (featuring old man Shotaro, old woman Akiko, Ryu as a ghost haunting the agency, and [[spoiler:Philip having not aged a day due to being data.]])
* [[TooCoolToLive Too Hardboiled To Live]]: Pretty much Sokichi in ''Begins Night''. [[FirstEpisodeSpoiler It's a given that he dies]], but ''damn it he's so hardboiled it hurts''.
* UnfortunateImplications: Jimmy's "[[HollywoodToneDeaf singing]]" style, spilk (''supikku''), sounds like a certain ethnic slur for Hispanics.
** And his singing is almost as offensive as racism.
* ValuesDissonance: Some western fans deride Kirihiko as a HenpeckedHusband because he is deferential to Saeko, took her name after their marriage and has been physically abused by her on at least one occasion, along with the implication that it wasn't the first time. A Japanese audience would be less inclined to see him as weak, since their society emphasises reverence towards social superiors and loyalty to one's employer.
** Hell, you don't have to be an expert on Japanese culture to see it working this way. Saeko is ''the BigBad's daughter,'' and Kirihiko is just a good Memory salesman. If Darth Vader had a daughter he actually liked and doted on and a ''pretty decent officer'' (sorta guy Vader won't hesitate to strangle) married her, if the officer thought he'd be her equal, he's TooDumbToLive. If you're brave enough, it's still quite a desirable position - fifth-highest member of the organization. And if he hadn't acted respectful, there is no way he would have had a chance of getting that high in the first place.
** Shotaro's fashion choice might turn off some Western fans, due to the infamous "fedora stigma" in the west recently.[[note]]Fedora-wearers are a rough equivalent of Japanese {{Otaku}} regardless of hobbies there[[/note]] Said stigma is not common to Japan, fortunately.
* WhatDoYouMeanItsNotSymbolic: Accel's jacket carries the slogan "Spiritual state of nothingness makes even itself fire cool", which is paraphrased from a Buddhist philosophy.
* TheWoobie: Akiko, ''especially'' after she finds out why her father could never see her again in ''Core''.