* AlternativeCharacterInterpretation:
** Naota's older brother, Tasuku. Is he a giant asshole that cared only about being a pro baseball player and not what damage he caused by leaving? Or is he a decent guy who just isn't good with people? Did he intentionally jilt Mamimi, like a giant asshole? Or did Mamimi just completely overestimate their relationship? Or both?
** Is Kamon an AbusiveParent {{manchild}} or he's an adult that has realized that he doesn't have to pretend a stoic attitude to be one. There's evidence for both suggestions.
* BetterOnDVD: This series is an OVA, after all. At six episodes, you can comfortably get through the whole thing in an evening.
* BrokenBase: [[Anime/FLCLProgressiveAndAlternative The second and third seasons.]] Some are excited to see a continuation of the story and the greater focus on the SpaceOpera subplot, while others think the series ended perfectly with the original [=OVAs=], and that the sequels' space opera elements will undermine the original's ComingOfAgeStory.
* CrazyAwesome: Everyone and everything, but especially Haruko.
* DracoInLeatherPants: Haruko being CrazyAwesome personified ends up absolving her of [[spoiler:trying to destroy the world and kill Naota]] in the eyes of most fans.
* DoubleStandardRapeFemaleOnMale: Sexual harassment in this case. Just try picturing the events of the series with the genders swapped.
* EnsembleDarkhorse: Kitsurubami is very popular in the fandom despite her minimal screentime.
* EveryoneIsJesusInPurgatory:
** Read more in Fridge, but you can take the plot as how literally comes. A kid meets an alien that wants to use his head that develops an adolescent skin condition that opens a interspacial portal where to bring the power of a space pirate. Or you can look the symbolism as see it as a big allegory to puberty, from meeting a new girl, getting all kinds of horny, quite literally, let your manhood pour out, becoming an adult and what does this means, after all, nothing interesting happens in Mabase.
** Read more down in Values Dissonance, but there's a theory that this series criticizes Japan's rather low consent age, from Naota's big brother and Mamimi, Haruko and Amarao [[spoiler:and later Naota... probably]] it seems that interacting like that, that young has unavoidable consequences. The healthiest relationship in the series is between Naota and Eri, and even then it seems that Eri has some issues.
* FauxSymbolism: A minor example, but the gigantic hand has a hole straight through its palm during episode 5 and the first half of 6, as if it had been nailed to a cross.
* FountainOfMemes: ''Haruko''. Practically everything she says or does has gone memetic.
* GatewaySeries: The soundtrack acts as the perfect gateway to Music/ThePillows. As a gateway series to anime, however, it's probably not the best choice.
* GermansLoveDavidHasselhoff: This series is almost completely unknown in Japan, even amongst otaku of the time. American anime fans, however, love it. Creator/AdultSwim pushing it relentlessly didn't hurt matters. Creator/{{Funimation}}'s decision to bring the series back into print was treated as a very big deal. The series' popularity among American fans and the staff at [adult swim] eventually reached the point where, in 2016, it was announced that Cartoon Network would be partnering with Creator/ProductionIG to produce two more seasons, something which only occurred one other time in the past with ''Anime/TheBigO''.
* HilariousInHindsight:
** Episode 5 features an ArtShift that parodies ''WesternAnimation/SouthPark''. Gainax would later go on to ruthlessly parody ''South Park'' and WesternAnimation as a whole [[Anime/PantyAndStockingWithGarterbelt a decade later]], complete with the same art shift. In addition, Kazuya Tsurumaki stated in the commentary that when they made ''FLCL'', no one in Japan had ever heard of ''South Park'', so the scene was met with blank stares.
** Haruko is a RoseHairedSweetie with [[InstrumentOfMurder instrument-themed weaponry]] voiced by Creator/MayumiShintani. Now why should ''that'' [[Anime/KillLaKill sound familiar]]?
* HolyShitQuotient:
** Episode 4: Naota saves the city from [[spoiler:a hand-shaped robot satellite that falls from orbit and ''pitches'' a gigantic baseball-shaped bomb at the city]], using [[spoiler:an electric guitar that Haruko pulls from his head to ''bat'' it]]. Yeah.
** Episode 5: Haruko [[spoiler:surfing on (in midair) and using a bass guitar]] to take down a [[spoiler:multi-story five-armed gunman robot that's actually a giant hand (each "arm" is a finger)]] -- while wearing a PlayboyBunny suit. That's not something you see every day, folks. The end of the series counts too.
*** Haruko wearing a PlayboyBunny suit during that batshit insane battle is actually a reference to [[https://en.wikipedia.org/wiki/Daicon_III_and_IV_Opening_Animations one of the opening videos a group of amateur animators made for DAICON in 1982 and 1983 before they later formed Gainax.]] To drive the point home, Haruko even shouts "Daicon!" in that scene.
** When Amarao opens fire on her in the barbershop, Haruko wields ''a razor'' and slices ''each and every bullet perfectly in half without effort''. Cue dozens of [[TheMenInBlack Men in Black]] with machine guns storming the place, and Haruko proceeds to defeat all of them without breaking a sweat:
---> '''Amarao:''' ...[[LampshadeHanging You can't be real]].
* MoralEventHorizon: Haruko feeding Naota to the Terminal Core, probably expecting that it would kill him, and knowing for certain that doing so could result in the demolition of the entire planet, all so she could "get what [she] want[s]." It's worse in hindsight - she abandoned Naota like Amarao when she thought she had successfully extracted his power into Canti, and only returned when it became obvious that this wasn't the case. Thankfully, she has a bit of a HeelRealization and leaves Naota alone afterwards.
* SugarWiki/MostWonderfulSound:
** The '''''BRNNNNNNNNNNNNNNNGGGGGGGGGGGG''''' when Haruko's bass guitar hits something.
** The droning "air raid siren" that emanates from Medical Mechanica, which usually means [[SugarWiki/MomentOfAwesome something bizarre and awesome is about to happen]].
* SugarWiki/SuperlativeDubbing: Many Western fans who are otherwise skeptical or outright hostile towards anime dubs ''love'' this dub. Many thought that the series was un-dubbable due to its use of Japanese puns and pop culture references. Instead, these were replaced with comparable English puns and cultural references. As for the cast, Kazuya Tsurumaki hand-picked the English voice actors himself, because it was vitally important to him that they have the same "essence" as the Japanese voice actors. He was particularly impressed by Haruko's voice actress, Creator/KariWahlgren.[[note]] Who at this point was a complete newbie that had never recorded a dub before.[[/note]]
* ThisIsYourPremiseOnDrugs: The series has its share of batshit insanity and like a drug trip, you can find some nuggets of true brilliance while your housekeeper with a chainsaw engine-powered guitar and robot that popped out of your head join you on magic adventures.
* TrueArtIsIncomprehensible: Knowing what's going in on this series will probably just ruin it.
* ToyShip: [[spoiler:Naota and Ninamori]]. At the very end, it's implied that they'll probably get together eventually if not immediately. It helps that it's definitely the healthiest male-female relationship, and [[spoiler:Ninamori]] herself always had the most sincere affection for [[spoiler:Naota]]. In a ShipTease, [[spoiler:Ninamori]] rigs the play just so she and [[spoiler:Naota]] get certain parts. Also the fact that she unashamedly reveals this to [[spoiler:Naota]] while holding his hand.
* ValuesDissonance: The creepy sexual content involving Naota and Eri, who are ''twelve''.
* SugarWiki/VisualEffectsOfAwesome: The manga sequences in Episodes 1 and 6. They better damn well be, since they both took massive chunks out of the show's budget. Even the character acknowledge it.
* {{Woolseyism}}: A significant portion of the dialogue had to be replaced for the English version, since the jokes would only make sense in Japanese, and they were replaced by comparable Western jokes and references. One example is the mention of [[https://en.wikipedia.org/wiki/Crystal_Pepsi Crystal Pepsi.]] In the Japanese version, this was [[https://en.wikipedia.org/wiki/Cheerio_(drink) Cheerio,]] a Japanese soda that was similarly discontinued.
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