* AbandonShipping: Tendou regards Hiyori so flirtatiously until [[spoiler:it's [[{{Squick}} revealed]] [[IncestSubtext that she's the girl that]] [[BrotherSisterIncest would have been his sister]]]].
** To be "fair", [[Series/MahouSentaiMagiranger this isn't]] [[Series/EngineSentaiGoOnger the first time]] [[Series/TensouSentaiGoseiger Toei]] [[Series/KamenRiderDenO has teased]] [[Series/KamenRiderKiva that kind of thing]] [[Series/KamenRiderDouble in its shows]], at times not even stopping the flirting after the bombshell.
*** However, it doesn't help the fact that all but one of the series above came AFTER Kabuto aired...
** And the fact that [[spoiler:she was the child of the Worms who had replaced the Kusakabe parents pretty much throws out the 'sister' thing.]]
* AlasPoorScrappy: The Hopper Brothers were both kind of annoying for awhile, either in their original iterations or, once they were teamed up as a goofy emo duo, they were a pair of [[ButtMonkey butt monkeys who were a bigger butt together than apart]]. The resolution of their storyline [[TearJerker is enough to make you sob]].
* AlternateCharacterInterpretation: Is Tendou a GodModeSue played straight, with his boundless confidence and superhuman abilities (even without using the Masked Rider System)? A ParodySue and partial deconstruction of the type (with his various failures, his strange obsessions, his inability to truly connect with others)? A DecoyProtagonist for Kagami (because Kagami is the one who actually espouses heroic values much better than him)?
* TheChrisCarterEffect: Kicks into gear around episode 30; not so coincidentally around the time EndingFatigue sets in.
* CrazyAwesome: Any fight using Clock Up.
* CrowningMusicOfAwesome: [[http://www.youtube.com/watch?v=FrI1Rygx2aU Full Force]].
* EndingFatigue: It's generally agreed that the plot haemorrhages coherence around episode 30.
* EnsembleDarkhorse: Kagami spends most of the series being a complete ButtMonkey. But once he proves himself worthy of the Gatack Zecter, he becomes far more heroic in almost every way than Tendo, even as Tendo continues to be the series darling. The series ''does'', however, lampshade that in some ways Kabuto and Gatack are equals and that Tendo respects Kagami, and perhaps ''only'' Kagami, because [[spoiler: the Gatack Zecter is the only one the Hyper Sword doesn't steal, leaving it to belong only to Kagami]].
** Tsurugi Kamishiro is one of the more popular comic relief character in the series. His LargeHam tendencies and overall goofiness trying to "learn how the common man works" help. His storyline ending helps even more.
** Two words: '''Kick'''. '''Hopper'''.
** BaseBreaker
* GameBreaker: Kabuto and Gatack's Hyper Forms.
** Tendou Souji when he does ... anything.
* GatewaySeries: This series has introduced many Western viewers to the Heisei Franchise/KamenRider series with its balance of humor, drama, and action. The Clock Up feature really seems to help as well.
* GodModeSue: Two words: Tendou Souji.
** At times bordering on ParodySue, especially in the series' more comical moments. The final episode has him [[spoiler: walk to ''France'' to pick up some tofu on a lark]].
* HarsherInHindsight: Tendou's remark at the rider anniversary segment at the end of one ep "If he's Stronger, than I'm strongest!" is no longer funny now that Araki Shigeru, Stronger's actor, has passed away.
* HellIsThatNoise: The Worm's beetle-like clicking. At times it is tolerable, but it can reach extremely unbearable pitches.
** The chef Worm Tendo fights has a really annoying noise that sounds like its'... farting.
* HilariousInHindsight: Hidenori Tokuyama/Yaguruma will be the lead star in a movie based on the boxing manga Thanatos: Mushikera no Kobushi, which will also star Yūki Satō/Kagami possibly as the antagonist.
** Yusuke Yamamoto/Kamishiro Tsurugi will play another eccentric "prince" AKA Tamaki Suoh in the OuranHighSchoolHostClub live-action adaptation.
* HoYay: Subtle with Tendou and Kagami, but more blatant in Yaguruma and Kageyama, ''especially'' after [[spoiler:they become the Hopper Riders]].
* MartyStu: Tendou Souji. Specifically, he's a GodModeSue and JerkStu in one.
* MemeticMutation: ''Start the ZECT-Van!''
** [[GratuitousEnglish My best friend]] [=KaGAAAmi=]~
* {{Narm}}: Depending on who you ask, the [[CookingDuel Dark Kitchen]] arc.
* NightmareFuel: No one expected the Masked Rider System to be developed from [[http://static.tvtropes.org/pmwiki/pub/images/NightmareKabuto3_2586.jpg brutal experimentation on poor]] [[spoiler: [[EvilCounterpart Dark Tendou]]]] as shown in Episode 48.
** Being experimented and caged up when you're just a young boy is bad enough, but [[http://static.tvtropes.org/pmwiki/pub/images/NightmareKabuto1_277.jpg to have Natives performing the experiments?!?]] That just makes this already disturbing scene [[UpTpEleven EVEN WORSE.]]
** Speaking of which, [[spoiler: Dark Kabuto's]] blood-curdlingly [[CheshireCatGrin child-like smile]] upon entering Earth in Episode 42 is enough to keep anyone up all night. [[HellIsThatNoise The creepy music doesn't help either.]]
** In a case of serious ParanoiaFuel, a Worm can become an almost perfect copy of anyone, including you. They are also stronger than you, can spit goo on you to kill you, and can slow down time to prevent you from escaping their clutches. The only way you can sense a worm is by their smell, which would be too late by then (unless you're a Kamen Rider, of course.)
* ParanoiaFuel: The Worm. The fact that a race of over-6"-tall, hyper-advanced aliens with retractable tentacles for hands have successfully managed to infiltrate Japanese, and, by a larger extent, world society, perfectly imitate the humans they encounter right down to their memories, and kill those they replicate, can be severely unnerving.
** Take that UpToEleven with [[spoiler:Tsurugi being the Scorpioworm without even realizing it]]. The only thing more unnerving than someone you know being a Worm is the possibility that [[spoiler:you are a worm yourself and you don't even realize it]].
* SpecialEffectFailure: Gattack's battle damage in 44 is very obviously just extra bits stuck to the suit, with obvious edges.
** There's various instances of transformations not melding very well (actor and suit actor standing in obviously different poses), sometimes bluescreen effects are sort of obvious, and some Worm are designed and fabricated better than others. Let's just say, some episodes obviously had higher budgets than others.
* ShockingSwerve: ''Everything'' involving [[spoiler:the Native Worm]].
* TearJerker: [[TearJerker/KamenRiderKabuto And loads of it...sniff.]]
* TheyJustDidntCare: The designs for the various Kamen Rider suits display a sort of increasing amount of this. The Kabuto suit is possibly one of the best-looking Kamen Rider suits of the modern era, with Masked Form turning into Rider Form in a way that really displays the nature of how the Masked Rider System works. The amount of elaborate moving parts and clear effort on the part of the fabrication team declines from there, bottoming out at Sasword, whose Masked Form is just some halfhearted kibble velcroed to his Rider Form. It takes an upswing back up for Gatack, who's almost as good as Kabuto, but this is likely because that suit was designed and fabricated at the same time as Kabuto's. [[WildMassGuessing Theoretically there could be an in-universe explanation for this]], but since it's never stated outright, it just looks like the design team got progressively more lazy.
* SugarWiki/VisualEffectsOfAwesome: The special effects are extremely impressive for a {{Tokusatsu}} series. From the cast-off and clock-up sequences to the choreography of the fight scenes, ''Kabuto'', even after 5 years since it originally aired, is still considered to be one of the best-looking series in the ''Franchise/KamenRider'' franchise.