* SugarWiki/AwesomeMusic: NO FEAR, NO PAIN, [...] CHOU HENSHIN, KAMEN RIDER KUUUUUUUUGAAAAAAA!
** The music that accompanies the [=TryGouram's=] debut, too.
** [[http://www.youtube.com/watch?v=7Hxi3kpBPiQ&feature=related The awesome theme that kicks in when Kuuga is kicking ass]].
** [[https://www.youtube.com/watch?feature=player_detailpage&v=qt59AY1BKjQ#t=131 When this theme kicks in, 9 times out of 10, the Gurongi of the episode is in deep, deep trouble. And it is awesome.]]
* CompleteMonster:
** Years after he blighted television screens in Japan, Go-Jaraji-Da (the Porcupine Gurongi) still stands as the standard to which other [[MonsterOfTheWeek kaijin-of-the-week]] in ''Franchise/KamenRider'' are compared to. Jaraji uses his upper-class privileges to choose the 90 teenage boys in Midorikawa High School's 10th grade as his targets for his game. Using super speed and poisonous darts that kills his victims from encephalitis within four days, Jaraji terrorizes and poisons all but one of his targets, condemning many of his victims to slow, brutal deaths and drives others to suicide. As those who commit suicide do not count to his Gegeru, Jaraji compensates by killing high-school boys belonging to other grades and numerous policemen. Most of the other Gurongi are either required to participate in the Gegeru or [[PunchClockVillain merely see the Gegeru as a necessary duty]]. Jaraji, on the other hand, commits his crimes precisely because he enjoys himself watching living beings suffer and coldly admits this to a family before closing in on one of his targets. It's no wonder [[FriendToAllChildren Yusuke Godai]] snapped and [[NoHoldsBarredBeatdown killed Jaraji]] [[TheresNoKillLikeOverkill so savagely]].
** [[BigBad N-Daguva-Zeba]] is the lord of the Gurongi and the Ur-CM of the Heisei era. An AxCrazy BloodKnight who [[TheSocialDarwinist absolutely despises the lowly and weak]], Daguva doesn’t care about any human or Gurongi lives, and is willing to use any means necessary to make humanity as violent and hateful as he. Upon being reawaked from Kuuga’s sarcophagus, he releases the 200 Gurongi and murders the archaeologists, thereby kicking off the series. After his escape, he restarts the Gegeru and kills 152 of his own kind in Nagano. He then reveals himself to the public by killing [[spoiler:Zu-Gooma-Gu]] for using his armor before resurfacing under the guise of a [[LightIsNotGood white-suited]] [[TeensAreMonsters teenager with an aura]] as he unleashes heavy rain in Japan. After Yusuke Godai (Kamen Rider Kuuga) defeats [[spoiler:Gadoru]], Daguva ambushes Kuuga, [[NoHoldsBarredBeatdown mercilessly beats him up]], and incinerates numerous people in his wake as he leaves Yusuke behind. [[spoiler:After continuing his systematic genocide, he meets Yusuke in Mount Kuro where they have their final fight. There, Daguva finally dies, [[EvilLaugh laughing to the very end]] hoping that Yusuke would be [[StrikeMeDownWithAllOfYourHatred corrupted by violent hatred]].]]
* FoeYay: Ichijo and B1/Rose Grongi.
* HilariousInHindsight:
** [[spoiler:It's stated in the finale that the Gouram was intended to disintegrate if Kuuga somehow grew too powerful, yet it doesn't happen even after he gains Ultimate Form. Fast forward to ''Series/KamenRiderWizard'', where he certainly qualifies after gaining an additional ''Rising'' Ultimate Form...]]
** It was hilarious even before that when [[spoiler:Decade ''turned Kuuga himself'' into a Gouram]], but was further compounded in the ''Final Chapter'' movie by [[spoiler:Kuuga having the ability to become Ultimate Gouram form at will]].
* HoYay: ''"...Why am I on your shoulder? This is the blunder of my life..."''
** It's implied that Ichijo is a bit stand-offish but he warms up to Godai rather quickly. At one point Tsubaki (one Ichijo's closer friends) calls Godai "his true love", poking at how attached Ichijo has become to Godai.
** The (dubiously canon) novel takes it further. Godai vanished after the events of Kuuga and only returns at the end of the novel 13 years later, defeating a monster terrorizing the city. Ichijo ends up being knocked unconscious during the incident and wakes on Godai's shoulder the way he did 13 years before. When Godai makes to go on his way Ichijo breaks down in TEARS and BEGS Godai not to leave again. [[TearJerker Godai still leaves]].
* MemeticMutation:
** Kuuga sure is a cool guy.
** Related to the above, Ultimate Form being the MemeticBadass form of all the Heisei riders for its simple yet sleek and regal design, black color, and the fact that apparently it can [[EarthShatteringKaboom destroy the world with its full power]].[[note]]Bear in mind, this is never stated or even hinted at in the actual series[[/note]]
** The so-called "curse of Kuuga" which, for the longest time (until 2010, when it was apparently broken after ten years), seemed to cause any fan translation projects to come to a sudden halt after about ten episodes.
* {{Narm}}: The Grongi's [[LargeHam over-acting]] in human form practically embodies this, and the goth makeup doesn't help.
* NightmareFuel:
** The resurrection of the Grongi in the first episode. A massive shape only seen in shadow slaughters the excavation group that accidentally unleashed him, then walks slowly across the countryside, causing trees and objects to ''explode'' with his mere presence before reviving the Grongi, causing dozens of hands to burst out of the ground like a zombie film.
** The Grongi in general. They're basically a entire ''race'' of ''{{Serial Killer}}s''.
** [[spoiler: N-Daguba-Zeba's debut in his perfect form, which is at the beginning of one of the last episodes where he has Kuuga on the ropes, belt damaged and beaten to the point that Godai can only watch as he starts setting people near by on fire in the rain. All of this is disjointed shown to the audience as Godai would have seen it with his own eyes.]]
** Problem being, of course, that we don't see it. The entire first fight between them is offscreen and Yusuke bounces back from it with no problem. It kinda makes Episode 47 a bit of a mind screw considering the Previews showed us a fight between them and then...nothing.
* SpecialEffectFailure: They ''really'' should have stuck to practical effects for the monster explosions. They look like something out of a [=PS1=] game. At the same time, this allowed them to have explosions in locations that would have been suicidally absurd to use practical effects in/on, and made some of the NightmareFuel possible in the first place.
* WTHCastingAgency: ''Kuuga'' is the first Heisei series to get a manga adaptation. Thing is, this is being written by Creator/ToshikiInoue, a writer known for making nice guys (like Yusuke) into [[ButtMonkey utter jokes]].