[[quoteright:327:http://static.tvtropes.org/pmwiki/pub/images/51ngujv80ol__sl460__6832.jpg]]

->''"The train of time, [=DenLiner=]. Will its next stop be the past? Or the future?"''

''Kamen Rider Den-O'' is the 2007-2008 series of ''Franchise/KamenRider'' and the eighth installment in the Heisei Era.

Ryotaro Nogami is the [[BornUnlucky unluckiest guy in the universe]]. But his life changes on the day he stumbles across a mysterious train pass that allows him to board the [=DenLiner=], a CoolTrain that [[TimeTravel travels through time]].

Just as he is recovering from the shock of this, he is suddenly [[DemonicPossession possessed]] by a monster known as an Imagin: shapeless creatures from the future that take on forms based on the ideas within their host's imagination. The Imagin make contracts with their hosts to gain physical bodies, offering to grant them a single wish. Once the wish is fulfilled, they can then use their host as a gateway back through time, aiming to destroy the past to seize control of the future.

However, it turns out that Ryotaro is a Singularity Point, a [[RippleEffectProofMemory person immune to any changes to the timeline]] and able to resist the possession of his Imagin. He is soon corralled by Hana, a mysterious passenger of the [=DenLiner=], into using his power as a Singularity Point and his [[TransformationTrinket Rider Pass]] to transform and fight the hostile Imagin invaders as Kamen Rider Den-O.

While Den-O's base form ([[{{Pun}} Plat Form]]) is incredibly weak, Ryotaro can relinquish control of his body to an Imagin who has possessed him and power up. His first Imagin, a HotBlooded BoisterousBruiser called Momotaros, transforms Den-O into the red Sword Form. Together, TheyFightCrime.

The plot thickens when Ryotaro discovers that Yuuto Sakurai, his sister's missing fiance, is hiding in the past for reasons unknown, and somehow linked to the Imagin attacks. Just as Ryotaro goes to confront him, he is stopped by none other than [[WhichMe a younger version]] of Yuuto Sakurai. This version of Yuuto is brash and cocky, bringing with him his ''own'' Time Train called [=ZeroLiner=] and the ability to transform into [[TheRival Kamen Rider Zeronos]].

Despite average television ratings, ''Den-O'' proved to be a massive hit in Japan, spawning multiple character song [=CDs=], a {{spinoff}} anime starring [[EnsembleDarkhorse the Imagin]] and '''eight''' [[TheMovie movies]] (along with supporting roles in three other movies), which is practically unheard of for a series that was only designed to last a year. The movies are:

* ''[[Film/KamenRiderDenOImBorn Ore, Tanjo! (I'm Born!)]]'': A rare aversion to the ''Franchise/KamenRider'' tradition of one NonSerialMovie per series, this film caps off the show's second act and revolves around the time-traveling bandit Gaoh and his theft of the [=DenLiner=], which he wants in order to find the forbidden "God's Line" and the powerful Time Train resting at the end. The series spends a couple of episodes teasing at the movie just before its release, then dedicated the next episode after the film's opening to dealing with the aftermath.
* ''[[Film/KamenRiderDenOAndKivaClimaxDeka Climax Deka]]'': Set after the series, this movie sees Team [=DenLiner=] setting up a detective agency when a rogue Imagin, Negataros, steals the Owner's Liner Pass and begins forming an evil organization. Nominally a CrossOver with ''Series/KamenRiderKiva'', the "crossover" is limited to a couple of brief scenes featuring Wataru and a BigDamnHeroes appearance by Kiva near the end of the final battle.
* ''[[Film/SarabaKamenRiderDenOFinalCountdown Farewell Den-O: Final Countdown]]'': The [=DenLiner=] crew must contend with the villainous Shiro and his minions, including Kamen Rider Yuuki. With Yuto injured and Ryotaro MIA ([[spoiler:possessed by the Ghost Imagin and forced to be Yuuki]]), the crew must turn to Kotaro, Ryotaro's [[KidFromTheFuture Grandkid From The Future]], AKA New Den-O, who doesn't exactly think too highly of Gramps or his Imagin partners.
* ''[[Film/ChoKamenRiderDenOAndDecadeNeoGenerationsTheOnigashimaWarship Cho-Den-O and Decade: The Onigashima Battleship]]'': The first in the Cho-Den-O film series, this movie ties directly into the Den-O arc of ''Series/KamenRiderDecade'' and sees the [=DenLiner=] crew, with brief support from Tsukasa Kadoya/Decade, battling a pair of Oni brothers/rogue Kamen Riders who seek to uncover a legendary and powerful battleship. Also features nominal cameos by ''[[Series/KamenRiderKiva Kiva]]'' characters (something of a nod to Climax Deka, also supposedly answering a few continuity issues with the aforemention Decade) as well as Riders from ''[[Series/KamenRiderAgito Agito]]'', ''[[Series/KamenRiderRyuki Ryuki]]'' and the ''[[Series/KamenRiderKabuto Kabuto]]'' NonSerialMovie summoned up by Decade's rival Daiki Kaito/Diend.
* ''[[Film/KamenRiderXKamenRiderXKamenRiderTheMovieChoDenOTrilogy Kamen Rider Kamen Rider Kamen Rider The Movie]]: Cho-Den-O Trilogy'': '''Three separate''' feature length films released in the span of a month, each one attempting to resolve plot points for a different set of characters, none of them are Den-O himself:
** '''''[[color:red:Episode Red]]''': '''Zero No S'''tar Twinkle'' focuses on Yuto being forced to choose between two jobs equally important to protecting the timeline - preserving his future self's relationship with Airi, and stopping an Imagin from stealing the [=DenLiner=].
** '''''[[color:blue:Episode Blue]]''': The Dispatched Imagin is '''NEW'''tral'' focuses on New Den-O and his relationship with his BattleButler Teddy, while having them battle a new Imagin and deal with a young woman and a supposedly EvilTwin.
** '''''[[color:yellow:Episode Yellow]]''': Treasure '''DE End''' Pirates'' focuses on...[[Series/KamenRiderDecade Diend]], who [[spoiler:thanks to Imagin possession, has stolen the [=DenLiner=]]], but is pursued by Kamen Rider G Den-O, a new Rider who resembles a Franchise/{{Metal Hero|es}}. This film gives Diend his own [[SuperMode Complete Form]] [[RuleOfCool to make a spectacle of the situation]].
* ''[[Film/OOODenOAllRidersLetsGoKamenRiders OOO, Den-O, All Riders: Let's Go Kamen Rider]]'': A ReunionShow, although, differently from ''Climax Deka'' and ''Cho Den-O and Decade'', the other titular stars are main characters too. This time around sees the [=DenLiner=] crew, led by New Den-O, teams up with ''Series/KamenRiderOOO'', ''Series/KamenRider 1'' and ''[[Series/KamenRider Kamen Rider 2]]''. All main Riders and also many secondary Riders also appeared for the series' 40th year MilestoneCelebration.
* Aside from these eight movies, characters from Den-O appear in three other ''Kamen Rider'' movies in a supporting role. Momotaros appears as Den-O in both ''[[Film/KamenRiderDecadeAllRidersVsDaiShocker Kamen Rider Decade: All Riders vs. Dai-Shocker]]'' and ''[[Film/KamenRiderXKamenRiderWAndDecadeMovieWar2010 Kamen Rider Kamen Rider W & Decade: Movie War 2010]]'' (only as Den-O in the latter). The cast of Den-O (The four Taros, Owner, and Naomi) also appear in ''[[Film/KamenRiderXSuperSentaiSuperHeroTaisen Kamen Rider Super Sentai: Super Hero Taisen]]''.

From start to finish, the [[Characters/KamenRiderDenO Character Page]] is always at a climax!

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!!''Kamen Rider Den-O'' provides examples of the following tropes:

* [[AnimeThemeSong Toku Theme Song]]
* ArcWords:
** "The past should give us hope."
** "Climax Scene" for the episodes leading into the first movie, [[spoiler:which, in the "aftermath episode", also brings us the '''Climax''' Form.]]
* BadassFamily: The Nogami family, giving us two Den-[=Os=] (Ryotaro and Kotaro), [[spoiler:Zeronos/Yuto, and BadassNormal Hana]]. Airi, not so much, but hey.
* BeCarefulWhatYouWishFor
* BigBudgetBeefUp: The last few eps.
* BiggerIsBetter: The Onigashima Battleship is '''huge'''. Comparing it to the [=DenLiner=] is like comparing [[Series/GoseiSentaiDairanger Daijinryu]] to a normal Zord.
* {{Blipvert}}: [[spoiler:Kai]] can dig into people for their memories, which turn out looking like this.
* CallingYourAttacks: Used, parodied, subverted and more.
* TheCameo: Given Den-O's long-running popularity, it's easier to list instances where there aren't cameos. However, some of the cameos stand out regardless.
** In episode 9, the master of the dojo who gets tossed out the window by Kintaros is played by Jiro Okamoto, Kintaros's suit actor. Various other martial artists who get beaten up in that same scene are also suit actors (including Eitoku, Urataros's suit actor).
** Wataru, the protagonist of ''Series/KamenRiderKiva'', makes a limited appearance in the ''Climax Deka'' film.
** Kiva's Arms Monsters return for another short cameo in ''The Onigashima Warship''. Mimicking Kiva's lesser importance in the previous crossover movie, they don't make sure that you notice.
* CasualDangerDialogue: Regularly. Enforced at times, when Den-O is suddenly able to off-handedly swat away the guy causing trouble.
* CombiningMecha: While not as [[HumongousMecha large]] as a [[Franchise/SuperSentai Sentai mecha]], the time trains fulfill the same function.
** Seven years later, Den-Liner [[Film/HeiseiRiderVsShowaRiderKamenRiderWarsFeaturingSuperSentai will combine with]] [[Series/ResshaSentaiTokkyuger a Sentai mecha]]: the [=ToQ-Oh=] [[Series/ZyudenSentaiKyoryuger Kyoryujin]] feat. Den-Liner!
* ContinuityNod: The drawing of Ryotaro's parents from ''Ore Tanjou'' shows up all the way in ''Chou Den-O Episode Yellow''. Can be considered BookEnds as these are the first and last times Takuya Mizoguchi starred as Ryotaro.
* CoolTrain: the [=DenLiner=], [=ZeroLiner=], [=GaohLiner=], and [=KingLiner=].
* CreationMyth: Invoked in the first Movie, as Gaoh is after a traintrack that goes to the beginning of time.
* CriticalAnnoyance: In ''Chou Den-O Episode Yellow'', [[Series/KamenRiderDecade Daiki/Diend]] hijacks the [=DenLiner=] to rectify his own mistake in the past, and manages to get around G Den-O with three minutes to spare -- upon which the clock starts beeping down. [[http://www.youtube.com/watch?v=aTDnJIpt0sY&t=43m52s It will become the longest three minutes in your life.]]
* CrossOver: In the movie ''Climax Deka'', the show was briefly crossed over with the 2008 series, ''Series/KamenRiderKiva''. The fourth ''Den-O'' movie takes place after its story arc in ''[[Series/KamenRiderDecade Decade]]'' and has cameos by the Arms Monsters from ''Kiva''.
* CurbStompBattle: ''Ore, Tanjou!'' has Gaoh's minions easily falling against Wing (in a separate battle), Rod, Ax, and Gun Forms. Sword Form, on the other hand, was the one in trouble, since he was facing Gaoh himself...
* DancingTheme: The Taros and Deneb (and Kivat in the {{Crossover}} movie) can be seen dancing to "Climax Jump" at the end of the opening credits.
* DeadlyDodging: at the beginning of ''Episode Yellow'', the Taros surround [[spoiler:the possessed [[Series/KamenRiderDecade Kaito]],]] he dodges, and the Imagin all hit ''each other'' in a CrossCounter.
* DemonicPossession: A more benevolent version, and the only way the Taros can interact with the physical world. Played for humor in ''Climax Deka'', where Momotaros is accidentally shunted into [[Series/KamenRiderKiva Wataru Kurenai]]'s body. In the fourth movie, the Taros possess the [[Series/KamenRiderKiva Arms Monsters]] as well as [[Series/KamenRiderDecade [=DiEnd=]]]-summoned copies of [[Series/KamenRiderAgito G3]], [[Series/KamenRiderKabuto Caucasus]], and [[Series/KamenRiderRyuki Ohja]]. [[Series/KamenRiderDecade Tsukasa/Decade]] himself gets possessed by all four Taros Imagin and Sieg, while Yusuke[=/=]Kuuga is possessed by Momo and Natsumi gets possessed by the other three main Imagins at different points.
* DenserAndWackier: OHHH YES. Aside from being LighterAndSofter than the [[Series/KamenRiderKabuto previous incarnation]], Den-O is FULL of funny moments stemming from [[CosmicPlaything Ryotaro's bad luck]] and the [[DemonicPossession Taro's possession hijinks]]. They even happen a lot [[MoodWhiplash during battles]].
* [[spoiler:EveryoneIsRelated: By the end of the series we learn that most of the primary human cast is related -- Yuto is Airi's future husband, and Hana is their daughter, making her Ryotaro's niece. And of course, we have Kotaro in the later movies.]]
* EverythingsBetterWithPrincesses: a minor character in ''Ore, Tanjou!'' that helps Hana infiltrate Gaoh's fortress.
* FakeDefector: [[spoiler:Urataros in #48.]]
* FollowTheLeader[=/=]GenreTurningPoint: Because of how absurdly popular it was, virtually every other ''Kamen Rider'' series that followed Den-O has taken at least one cue from it.
* FourIsDeath
* FourTemperamentEnsemble --> LuckySeven
* FunnyBackgroundEvent: Usually inside the [=DenLiner=], especially with Naomi and Ryuutaros.
* GratuitousEnglish: Among others: "Full Charge!", "Charge And Up!"
* HeroicSacrifice: [[spoiler:The Taros, Sieg and Deneb have no problem protecting the timeline from their kin, even if it means that if the Imagin race are successfully defeated, it would mean the end of their ''own'' existence as well. Prior to the final battle, Kai himself calls them out on this, asking them if it's okay for them to disappear for the sake of the humans. The one who had the problem for this setup was instead Ryotaro, leading him to go AchillesInHisTent, and even have a brief falling out with his partners.]]
* HypocriticalHumor
** In ''Episode Red'', the Piggies Imagin and Den-O (as Climax Form) throw insults at each other for SharingABody (the Piggies Imagin with his siblings). In the end, however, they both agree that the whole concept was gross.
** Also, earlier in that same movie, Urataros corrects Deneb for callimg him "Kametaros", then proceeds to call Deneb "Odebu", only to ignore Deneb's own correction.
** In ''Episode Yellow'', Momotaros (in Climax Form) derisively says "What's with that form?" when he sees Diend's Complete Form.
* IdenticalGrandson: In the third movie, Airi, Miura, Ozaki, and supposedly older Sakurai's ancestors in 1729 are played by the same actors.
* IntercontinuityCrossover: Series/UltramanTaro of the ''Franchise/UltraSeries'' appears in the last episode of the third Imagin Anime.
* InterfaceSpoiler: A non-video game example, oddly: The [[TransformationTrinket henshin belt]] has 4 buttons on it, indicating that Ryotaro will have 4 different Imagin possessing him for different forms, even ColorCodedForYourConvenience so you know that those all-yellow and all-purple Imagin are gonna be part of the crew. [[spoiler: And then Sieg comes in to give him a fifth form, subverting it partially since it's rarely used.]]
* InTheStyleOf: "Double-Action" again. And again. And again...
* JackassGenie: Sure, the Imagins will grant your wish... But they'll always choose the interpretation of it that will cause the most harm to you and others. Example : "I want to play soccer again!" "Okay, I'll just put the other players into hospital!" Though this could be justified due to the fact that they're not actual wish-granting genies, and thus try to find any loophole they can to render the contract "complete" and thus allow them to travel to the past.
* JidaiGeki: In the first, third, and fourth movies.
* TheLastOfTheseIsNotLikeTheOthers: ''Episode Yellow''; not only do the previous two movies focus on a Rider from ''Den-O'', but they also involve an Imagin (outside of the Taros) as an important part of the plot. Instead, ''Yellow'' not only focuses on a Rider [[Series/KamenRiderDecade outside the series]], but there was barely any Imagin involvement at all. [[note]]There ''is'' one, but it's only to kickstart the plot.[[/note]] Not unless you would count [[AIIsACrapshoot Eve]]...
* {{Leitmotif}}: All the belts make some kind of music during transformation, but the big-band themes in the soundtrack fit this trope closer.
* LetsGetDangerous: When you hear Liner Form's primary theme, you better expect this!
* LighterAndSofter: This trope is the reason ''Den-O'' is so popular.
* MagicMissileStorm: The Boistous Shot, Climax Form's Gun Form-based 'Charge And Up' finisher is this.
* MeaningfulName:
** "''Den-O''" is written with ''Kanji'', instead of Katakana, using the characters for "(Electric) Train" and "King".
** Also, the Imagin-less "Plat Form" is both this and, as stated at the start of the article, an IncrediblyLamePun. [[DontExplainTheJoke Y'know, seeing as it serves as the platform of all the other forms and all.]]
** A couple in ''Chou Den-O Episode Yellow'':
*** G Den-O is partnered with the first artificially-created Imagin - instead of naming it Adam, it's named Eve, who was responsible for the great fall from Eden.
*** It's heavily implied that G Den-O's mother was barred from ever seeing him because his aristocratic family didn't approve of her background. She's named [[MemoirsOfAGeisha Sayuri.]]
** The Imagin themselves. Their name is based on the English "imagine," the Arabic "djinn" (a demon of sorts), and the Japanese "ima jin" (literally "now person").
* MechaExpansionPack: In a technical sense, [[spoiler:the [=KingLiner=] for the [=DenLiner=].]]
* MechanicalMonster: What the [=GaohLiner=] comes across as.
* {{Mondegreen}}: At one point, near the end of episode 10, Owner says "Ladies and gentlemen, [[GratuitousFrench madam et monsieur]]". Takenoko, a translator from the fansub group TV-Nihon, misheard the second part as "Banana new shoe", which has since then become a minor meme.
* TheMovie: ''Den-O'' has '''eight''' feature length films (three of which premiered as an anthology), with the most recently-announced as a MilestoneCelebration for 40 years of ''Franchise/KamenRider''.
* MultiformBalance:
** Den-O
*** JokeCharacter -- [[color:gray:Plat]] Form
*** JackOfAllStats -- [[color:red:Sword]] Form
*** StoneWall -- [[color:blue:Rod]] Form
*** MightyGlacier -- [[color:gold:Ax]] Form
*** GlassCannon -- [[color:purple:Gun]] Form
*** LightningBruiser -- [[color:cyan:Wing]] Form
*** SuperMode -- [[color:red:Cli]][[color:blue:m]][[color:gold:a]][[color:purple:x]] Form
*** SerialEscalation -- [[color:cyan:Super]] [[color:red:Cli]][[color:blue:m]][[color:gold:a]][[color:purple:x]] Form
** Zeronos
*** JackOfAllStats -- [[color:green:Altair]] Form
*** MightyGlacier -- [[color:gold:Vega]] Form
*** LightningBruiser -- [[color:crimson:Zero]] Form
* MundaneUtility: The [=DenLiner=] is, and always has been, a passenger train (time-traveling, yes, but you get the point).
* NegativeContinuity: Between the movies; ''Climax Deka'' ends with the group deciding to keep their detective agency open; ''Final Countdown'' makes no mention of it, and ''Onigashima Battleship'' might not even be in the same continuity as the rest of ''Den-O'' due to being a ''[[Series/KamenRiderDecade Decade]]'' AlternateUniverse.
* NeverTheSelvesShallMeet: Averted and used straight.
* NewPowersAsThePlotDemands: Towards the end of the TV series, the show decided to throw out the rule book on how exactly the Den-O system (and Imagin possession) work, and instead run on RuleOfCool. By the time of the crossovers, there seem to be ''no'' rules: the core Imagin can freely possess and un-possess anyone at will, and can even transform into Den-O without a human host.
* PaperPeople: The style of the ''Imagin Anime'' shorts. Gets outright [[MediumAwareness self-aware]] in one episode.
* RearrangeTheSong: ''Den-O'' is known for this. "Double-Action" and "Climax Jump" have been remixed several times. For a sample of "Climax Jump": [[http://www.youtube.com/watch?v=8zladOg3q6g=18 Den-Liner Form]] (all four Taroses), [[http://www.youtube.com/watch?v=WaxQNtVMN6w Sword Form]] (hard rock for Climax Jump, eurobeat for Double Action), [[http://www.youtube.com/watch?v=ZoMnAfU07Zw Rod Form]] (ska), [[http://www.youtube.com/watch?v=S28NuYfG_tc Ax Form]] (ENKA), [[http://www.youtube.com/watch?v=OBfBRT9WgDk Gun Form]] (hip hop), [[http://www.youtube.com/watch?v=WLPKpVkkp4w The Final]], Chō Climax Jump...
* RetCon: The ''Chō Den-O Trilogy'' changes the rules on Imagin time travel from the show, now saying that if an Imagin successfully travels to the past, the act will destroy the contractor's past self (via dissolution into sand).
* ReunionShow: ''Kamen Rider Den-O & [[Series/KamenRiderKiva Kiva]]: Climax Deka''.
* RippleEffectProofMemory: A ''very'' important plot point; all Singularity Points essentially have this.
* RuleOfCool:
** Again, Riders on horseback.
** Not until ''Series/KamenRiderOOO'' will you see all forms of a single Rider transforming and fighting side by side.
* RuleOfFunny
* SanDimasTime
* SeriesContinuityError: ''Final Countdown'' has Kohana literally hand out about a half-dozen spare Rider Passes (and, by extension, Den-O Belts) to the Taros in order to let them participate in the FinalBattle. This screws up the plot of ''Chou Den-O Episode Yellow'', where Den-O losing his pass to Kaitou is treated as something terrible.
* SetRightWhatOnceWentWrong: A rather confusing one, actually, as there are only certain things that ''can'' be fixed and it seems the only way you're allowed to do it is if you're stopping an Imagin in the process. Several times, someone in the group alters the past so that the person never made the DealWithTheDevil with the Imagin in the first place, negating the wish altogether along with all the damage the Imagin caused, including what normally would've been erased for good. While things will continue as they originally did in these cases, the VictimOfTheWeek normally comes off much happier for it. For example, a man who originally missed his band's recital and blamed himself, becoming obcessed with getting enough money to make it big had time altered so he ''did'' make the recital but his band still didn't make the cut. However, the man was now trying to make his way to the top through his own talent and hardwork instead of buying his way there and was much happier than in the original timeline.
* SharedUniverse: ''Climax Deka'' seems to indicate that ''Den-O'' and ''Kiva'' are set in the same 'verse, just like ''Kuuga'' and ''Agito''. This was compounded in ''Onigashima Battleship'' with the random cameo appearances of Kiva's Arms Monsters.
* ShoutOut:
** The similarities between Sieg and [[Series/KamenRiderRyuki Kamen Rider Odin]] are more than subtle.
** And Momo, Ura, Kin and Ryu have horns arranged in a manner resembling [[Series/KamenRiderHibiki Hibiki, Ibuki, Todoroki and Sabaki]] respectively.
** Not sure if it's a shout out or would be classified as something else, but there's a very obvious parallel between ''Den-O'' and ''Series/JukenSentaiGekiranger''. In ''Gekiranger'', the team is made up of 5 people in Red, Blue, Yellow, Purple, and White. In Den-O the team is made up of 1 person with other people in him corresponding to the colors Red, Blue, Yellow, Purple, and White (for Wing Form). Also, in both shows, TheRival has the colors Green and Black related to them in some way. Interestingly, both shows aired alongside each other. An announcement of a Geki/Den-O joint promotion even ends with the five Gekiranger mimicking the poses of their respectively colored Imagin. As if returning the favor, the Imagin would later appear in promos for the [[Series/KamenRiderKiva Kiva Movie]], but mimicking the Catch Phrases of the next Sentai, ''Series/EngineSentaiGoOnger''.
** As pointed out in the design book ''Imagin: Say Your Wish...'', the first few enemy Imagin correspond to Riders from ''Series/KamenRiderRyuki'': Bat to Knight, Chameleon to Verde, Crust to Scissors, Crow to Odin, Rhino to Gai. Additionally, as mentioned under ActorAllusion, the Cobra Imagin is designed to resemble Ohja, and is also voiced by the same actor.
** According to ''Re:Imagine - Detail of Heroes 03'', the villains from ''Onigashima Battleship'' are modeled [[Series/KamenRider Riders 1 and 2]] (Goludora) and [[Series/KamenRiderV3 V3]] (Shilubara). They also not only draw upon the gold and silver-themed heroes of ''{{Garo}}'', but transform the same way.
** Teddy displays the [[Anime/MobileSuitGundam Newtype Flash]] when protecting Kotaro from bad luck.
* ShownTheirWork: A minor bit of trivia about UsefulNotes/SanadaYukimura states that ''dango'' is his TrademarkFavoriteFood -- in ''Ore Tanjou'' Ga-Oh takes over Sanada's castle, commanding all his slaves to dig for the [=GaohLiner=], and is shown taking a big plate of Sanada's ''dango'' as a KickTheDog gesture.
* SlidingScaleOfIdealismVersusCynicism: ''Den-O'' skews '''very''' idealistic; out of all the Imagin contractors, all but one or two are good people whose wishes were well-intentioned (or only slightly misguided, but they see the light at the end of the arc). Yuto initially thinks Ryotaro is soft for putting so much effort into helping the victims rather than just fighting the Imagin, but eventually comes around to the [=DenLiner=] crew's way of thinking. Even when [[spoiler:Sakurai disappears into the timestream at the climax]], it's treated as a temporary separation rather than KilledOffForReal.
* {{Spinoff}}: ''[[ExactlyWhatItSaysOnTheTin Imagin Anime]]''
* SwissArmyWeapon: The [=DenGasher=] and [=ZeroGasher=] both have the ability to change into different weapons with a little bit of parts-shuffling. Naturally, their toy counterparts can do the same.
* ThemeMusicPowerUp
* ThrowTheDogABone: Ryuutaros meeting Airi ''for real'' in ''Climax Deka''.
* TimeCrash: [[BigBad Shiro's]] big plan in ''Final Countdown'' involves bodyjacking Ryotaro and making him destroy his own ancestors in the past, which should have this effect. It's disproved later on in ''Episode Yellow'' though.
* TimePolice: What the [=DenLiner=] crew see themselves as. Later, in ''Episode Yellow'', an officer from an ''actual'' time police appears, G Den-O.
* TimeTravel
* TimeyWimeyBall: "Memories ''are'' Time", which is a plot point on several occasions.
* TooLongDidntDub: A source of controversy in the fandom is subbing group TV-Nihon leaving as many honorifics as they can in the subs. While it wouldn't be too surprising for Japanese-themed series like ''[[Series/SamuraiSentaiShinkenger Shinkenger]]'', expressions like "cow-san-tachi" (seen in the ''Imagin Anime'') can be jarring for fans with a minimal knowledge of Japanese. This is actually a recurring problem with said group.
* VFormationTeamShot: ''SIX'' Den-Os plus Zeronos in ''Final Countdown''.
* TrickedOutTime: When Ryoutaros or the Taros change time, the owner allows it so long as [[CloseEnoughTimeline things don't change too much]]. Thus, most of Ryotaros' travels to the past end up with him helping the VictimOfTheWeek with their issues by changing the past just that tiny bit.
* VictimOfTheWeek: Common for Franchise/KamenRider, to the extent that future series like ''[[Series/KamenRiderDouble Double]]'' and ''[[Series/KamenRiderOOO OOO]]'' have adopted it. Even the multitude of Den-O movies uphold this tradition, so much that some unexpected examples turn up ([[spoiler:young Ryotaro in ''Ore Tanjou'', young Yuuto in ''Onigashima Battleship'', and even ''G Den-O'' in ''Chou Den-O Episode Yellow''.]])
* VillainProtagonist: All of the Taros (minus [[TokenGoodTeammate Kin]]) start out as this.
* VillainTeamUp: ''Climax Deka'', where Negataros recruits several [[Series/KamenRiderKiva Fangire]] into his evil organization.
* WHAMEpisode: #39: after some usual hijinks for most of the episode, we then get treated to [[spoiler:a past version of Yuto actually being killed by the Snail Imagin, causing the present Yuto to disappear.]]
* WHAMLine: What sets off the DarkerAndEdgier tone of the final leg of the series:
-->[[spoiler:'''Kintaros:''']] ''Your wish has been granted.''
* WhoWouldWantToWatchUs: One episode of ''Imagin Anime'' shows the Taros' as producers at Toei, and they end up haphazardly creating their own series.
* WidgetSeries: The crowning example within the ''Kamen Rider'' franchise.

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