* 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.
%%* 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.]]
* 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]]
* TheScrappy: ''Everyone'' hates Houjou, both in the show and in the fanbase. He often comes up with excuses as to why G3 and later on G3-X can't fight the Unknowns, frequently antagonizes Ozawa, and, during the final episodes, [[spoiler: convinces the higher-ups of the police force to ''not'' fight the Unknowns due to him thinking that them ''killing innocent people'' is justified.]]
* TooCoolToLive: [[spoiler:Another Agito]]