* AntiClimaxBoss: [[spoiler: The Overlord of Darkness goes down from a single Rider Kick after Shouichi, Ryo, and Hikawa kill the Els of Wind and Earth. Though to be fair, he was in a position were he was vulnerable and couldn't really use most of his powers at the time. And it didn't ''kill'' him. He just decides to give up his little conquest against the humans and that's it.]]
* AudienceAlienatingPremise: One that was thankfully caught and scaled back. Originally intended to be a direct sequel to ''Kuuga'', someone working on the show raised the point that if another show was made about a new group of Grongi springing up then all of Kuuga's hard work would've been for nothing, which could've turned off returning viewers. Thus the monsters were turned into something completely unrelated, and the only real link is the police having created a power suit originally meant to fight Grongi.
* BrokenBase: Is the V1 System a Kamen Rider or a [[Franchise/MetalHeroes Metal Hero]]? The debate comes from the fact that the suit was made by PropRecycling from various Metal Heroes series (as noted on the Trivia page). Officially, Toei has not taken any stance - the V1 system was not among the group of Rider Reinforcements led by [[Series/KamenRiderOOO Akira Date/Kamen Rider Birth]] in ''Let's Go Kamen Riders''[[note]]The [[Series/KamenRiderRyuki Alternatives]], whose status as a rider is equally debatable, [[Series/KamenRiderKiva Kamen Rider Dark Kiva]], and, ironically enough, fellow ''Agito'' Kamen Rider Another Agito, were also absent from the reinforcements[[/note]], but it was also not among the list of Metal Heroes shown in ''[[Film/KamenRiderXSuperSentaiXSpaceSheriffSuperHeroTaisenZ Super Hero Taisen Z]]''[[note]]although like the rider reinforcements, there are absences - said list does not include ''Series/BRoboKabutack'' or ''Series/TetsuwanTanteiRobotack'', although [[FranchiseKiller there is good reason for this]][[/note]].
%%* CompleteMonster: Anguis Femineus, the Gorgon Lord. She actually [[PsychoForHire takes sadistic pleasure in her murders]], [[EvilLaugh laughing sinisterly]] as she stalks her victims. She even murders [[spoiler:Sakiko Mikumo]], a normal human, out of ''spite'', causing the Overlord to force her to kill herself as punishment.
%%** A number of the Lords - despite supposedly being Angels and even making hand-signs for permission to sin - actually display sadistic pleasure in killing their victims. E.g. Corvus Croccio, Apis Mellitus, and the aforementioned Anguis Femineus.
* CrowningMusicOfAwesome: [[http://www.youtube.com/watch?v=Y2f1oEZLGdI DEEP BREATH, We need it, just focus!]]
** Years after Agito aired, [[http://www.youtube.com/watch?v=ANEt7s6bu6Q Believe Yourself]] still might just be the best song whenever a Kamen Rider finishes his foe.
** Agito's CoolBike Machine Tornador has its own [[https://www.youtube.com/watch?v=s0iPupYkZL8 theme song]].
* HilariousInHindsight: Episode 34 sees Agito defeat one of the Unknown using [[Manga/OnePunchMan one punch after transforming]].
* {{Narm}}: thanks to a variant of SpecialEffectsFailure. [[spoiler:After the black Overlord takes back the powers of Agito, Gills and Another Agito, Shoichi goes through a Heroic BSOD of sorts before literally fighting to reclaim them in episode 46. At the critical moment (see DidYouJustPunchOutCthulhu above), the black Overlord goes down and the powers he's taken emerge...from his groin.]]
** In TheMovie, when [[spoiler: Gills gets his arm cut off,]] the stump wobbles around amusingly.
** On a couple of occasions we see a closeup of a Lord opening it's mouth wide...and it's clearly someone using the mask like a hand puppet.
* NightmareFuel: The various methods the Unknown use to attack their victims.
** Gills himself qualifies as well, especially when you see ''his helmet come alive.''
** Gills is an organic Rider, like [[Series/KamenRiderAmazon Amazon]]. [[BodyHorror That's not a helmet.]]
** The Unknowns themselves are very nightmare fuel. From their humanlike appearances to the fact that they're constantly hissing or growling (the only word they seem to say is "Agito"). The BGM that accompanies them onscreen does not help.
* OlderThanTheyThink: This is ''not'' the first time Kamen Rider rides a Honda.[[note]]That could go to the very first ''Series/KamenRider'', which had Hondas as basis for Custom Cyclones, although Honda didn't sponsor the franchise until ''Agito''.[[/note]]
** On the other hand, this ''is'' the first series to feature talking weaponry in the form of the GX-05 Cerberus Gatling Gun - while the weapon doesn't [[CallingYourAttacks call attacks]], it ''does'' have a "Releasing Safety" message and an error code for an incorrect activation.
* TooCoolToLive: [[spoiler:Another Agito]]