[[quoteright:320:http://static.tvtropes.org/pmwiki/pub/images/small8458835_745.jpg]]
[[caption-width-right:320:[[DidWeJustHaveTeaWithCthulhu She is the Chaos that always crawls up to you with a smile]]!]]

Mahiro Yasaka is an OrdinaryHighSchoolStudent who happens to be a fan of the Franchise/CthulhuMythos. One day he was attacked by a creature he identifies as a nightgaunt, only to be saved by a {{Mystical White Hair}}ed girl ... who introduces herself as none other than the Crawling Chaos, ''Nyarlathotep''.

This strange girl -- "Nyarko" as she prefers to be called -- is an agent of the Planetary Defense Organization, tasked to stop a smuggling ring revolving around a precious cosmic commodity... [[KlingonsLoveShakespeare Earth's entertainment]], specifically {{anime}} (and especially {{hentai}}). But she's not only out to perform her task, she also takes it to herself to protect Mahiro [[ArsonMurderAndJaywalking ...and to go shopping]].

'''[[http://ga.sbcr.jp/novel/nyaruko/index.html Haiyore! Nyarko-san]]''' is a 2009 RomanticComedy LightNovel series written by Manta Aisora and illustrated by Koin (of ''LightNovel/{{Kanokon}}'' fame) with elements from {{Toku}} and the CthulhuMythos. [[LovecraftLite It isn't as bad as you think, though]], especially since [[AffectionateParody it doesn't take itself all that seriously]]. As it turns out that while the mythos beings are real, Creator/HPLovecraft pretty much exaggerated the stories from his [[HumanoidAlien Nyarlathotepian]] friend and turned them into horror tales.

The series has been well-received in Japan, spawning numerous drama [=CDs=] and a nine-episode short-Flash anime called ''Haiyoru! Nyarani''. An 11 episode TV Flash series called '''Haiyoru! Nyaruani Remember my Love(craft-sensei)''' aired in Winter 2010, followed by a traditional animation season come the Spring2012AnimeSeason. The opening for said anime would achieve [[MemeticMutation memetic status]] on NicoNicoDouga with the [[EarWorm Un! Nya! Let's GO!]] [[http://youtube.com/watch?v=rv6iuCtQXkE portion of the opening]]. A [[http://www.animenewsnetwork.com/news/2012-09-27/nyarko-san/another-crawling-chaos-anime-gets-2nd-season second season]], ''Haiyore! Nyarko-san W'', is aired as part of the Spring2013Anime lineup. There will also be a video game released for the [[PlayStationVita PS Vita]].

Being a slapstick comedy based on the CthulhuMythos, it's a pretty violent story. It is also a [[ReferenceOverdosed hurricane of anime and manga]] {{Shout Out}}s and [[MythologyGag Mythos-ology Gags]].

Crunchyroll streamed both TV seasons under the title ''Nyarko-san: Another Crawling Chaos'', releasing the two ''Nyaruani'' series before the first to drum up interest; all four shows can watched for free [[http://www.crunchyroll.com/nyarko-san-another-crawling-chaos here.]] [[Creator/NipponIchi NIS America]] has picked up the TV anime for a physical print run under the title ''Nyaruko: Crawling with Love!''.

----
!!These are the Tropes that crawl up to us with a smile!

* AdamAndEvePlot: Invoked in episode 7 of season 2. Mahiro wakes up on what appears to be a deserted island with Nyarko, and she immediately mentions this trope to him. [[spoiler: However, in actuality, they're still at the indoor swimming park, and several people walk by when he mentions it, and the camera also changes angles, revealing the shops on the other side of the two.]]
** What makes it even funnier? [[spoiler:Those buildings are a prime example of BehindTheBlack -- unseen by the audience until the angle change, but right smack-dab in front of Mahiro.]] Didn't really think that one through, did you Nyarko?
* [[AliensAreBastards Aliens Are]] [[HumanityIsInsane Insane]]: Nyarko and Kuko are psychotic stalkers, and the Great Old Ones are so obsessed with Earth pop culture that they have smuggling of it, [[spoiler: and some of their media watchdogs try to destroy the Earth over considering it a threat to moral health.]] And people say HumanityIsInsane.
** The aliens are based on the ''CthulhuMythos.'' Nothing else needs to be said about this.
* AffectionateParody: You can tell those in charge of the series [[ShownTheirWork are quite familiar with and are fans of]] Lovecraft's work and the actual CthulhuMythos, and use that to great effectiveness here.
** The show also cheerfully skewers the Harem genre; while Mahiro has three PrettyFreeloaders, one is interested in another, while the third is [[HoYay a guy]].
* AgitatedItemStomping: In Novel 1/episode 2, when Nyarko offers Mahiro a box which she says contains an engagement ring, he responds this way. She immediately apologizes, saying that was just a joke and the box really contains a protective charm.
* AIIsACrapshoot: A first it looks like it's this for the [[spoiler: Banshin]] and then it looks like it gets subverted because they [[spoiler: simply based its mind on ''Nyarko's'']] and ''then'' it turns out that [[spoiler: it really is crazy enough to kill Mahiro after all]].
* AlienGeometries: Nodens' auction house in R'lyeh is BiggerOnTheInside that on the outside, of course.
* AlienLunch: An ongoing RunningGag. Nyarko keeps using alien ingredients on everything she cooks, be it shantak bird eggs, Shub-Niggurath (the "Black Goat of the Woods") meat or her famous [[FunWithAcronyms "BLT"]] (Byakhee-Lloigor-Tsathougga) sandwich. And then there's the hotdog from Episode 4 of the second anime -- "dog" here meaning "Hound of Tindalos".
-->'''Mahiro:''' "I'm definitely gonna kick the crap out of you if you prepare something like that!" (Episode 1, referring to the "BLT")
* AllLoveIsUnrequited: Almost all the relationships in the series. Hasta and Tamao (and later Cuuko) have feelings for Mahiro, Luhy develops feelings for Hasta, Cuune has feelings for Cuuko... And of course, the series centers around Nyarko's feelings for Mahiro, but he actually ''does'' like her even if he's [[CanNotSpitItOut not willing to say so out loud]], a situation that [[CharacterDevelopment slowly improves]].
* AllThereInTheManual: One can watch the anime without reading the novels, but it does provide a lot of useful information. For example, after busting up Nodens' black market auction, Nyarko took ''300 years' worth of paid vacation'' in order to be with Mahiro, and Mahiro is revealed to be able to perceive and resist fluctuations in space-time (which is mentioned early on, but becomes a ChekhovsSkill later).
* AmusementParkOfDoom: In Episode 2 of the second anime, we learn that R'lyeh is essentially a twisted version of Disneyland which caters to {{Eldritch Abomination}}s. Of course, other than the fact that it's full of alien beings, there's really nothing deadly about it.
* AnachronicOrder: An odd adaptational version, as the anime doesn't stick with a straight one-to-one transfer from the novels. For example, episodes 4 & 5 of the first season, which sees Cthulhu Corp. kidnapping Mahiro's mother, were drawn from the fourth novel; episodes 9 & 10, in which [[spoiler:Mahiro and Nyarko [[FreakyFridayFlip swap bodies]]]], were based on the third.
** ''Nyarko-San W'' adapts novels 5-7; while the fifth and sixth occur in order, stories from the seventh are sprinkled throughout the season. On top of that, the final episode is based on a short story collected in the ''eleventh'' novel. And this of course isn't taking into account the anime-exclusive episodes, which include the finale of the first season.
* AnalogyBackfire: In episode 7 of the second TV series, Nyarko compares herself and Mahiro to two trees which have grown together; he responds that diseased limbs need to be removed immediately.
* AnguishedDeclarationOfLove: Nyarko does it to Mahiro in episode 6 of season 2, after being [[LoveHurts extremely unhappy]] watching his fake date with Kuuko. She lays on top of him in his bed, and tells him yet again that she cares for him deeply, and wants to know what his feelings towards her are, as she's unsure of them.
* AnimationBump: ''Remember my Love(craft-sensei)'' is a Flash series, but the Ending credits are done traditionally. As a result, the Credits have better animation than the show itself.
* ArtEvolution: Comparing the character designs from ''Remember my Love(craft-sensei)'''s ending to the two TV shows an interesting reversal. In the former, Mahiro's face was more lean and angular (and therefore looked slightly older and more masculine), while Nyarko's was rounder (and therefore younger-looking and more feminine); in the latter, these traits have swapped, so Nyarko's face is more angular while Mahiro's is rounder.
* ArtisticLicense: Aisora {{lampshaded}} this in the second light novel, discussing how he has to twist the elements of the Franchise/CthulhuMythos more and more as the story goes on. He joked that [[Series/KamenRiderDecade by the 10th volume, it would be beyond recognizable, and Nyarko would have to destroy the world in order to reestablish it]].
* ArtisticLicensePhysics: Cuuko claims that her cousin Kunne's flames can reach a "thousand degrees", and that her chill attack could reach below one thousand degrees [[note]]this would be well below Absolute Zero[[/note]]. Mahiro responds that it sounds like something a kid would think up.
-->'''Mahiro:'''"Don't ignore the laws of physics."
* AscendedExtra: Shantak was a minor character in the 2012 series, but got a pretty important role in the sequel.
* AsideComment: Nyarko looks at the camera and repeats a second time that she has a convenient barrier to keep up TheMasquerade because, in her own words, it is important information.
* AttemptedRape[=/=]BlackComedyRape: Twice. In episode 2 (second anime) Kuuko defeats Nyarko in battle and then ties her down on a four-poster bed. At the end of Episode 6 Nyarko tries to get Mahiro in his bed. In both cases the attacker believes it to be an act of love, and the victim succeeds in fighting them off.
* AttentionDeficitOohShiny: Nyarko loses track of objectives easily, especially when confronted with her hobbies or anything fun.
* BabiesMakeEverythingBetter: In episode 7 of the second anime, Yoriko says she approves of Nyarko dating Mahiro, but asks her to slow things down, since "high schoolers should have a high school romance". Nyarko agrees, but thinks to herself that parents always change their minds when the grandchildren start being born...and develops a ''[[VisualNovel/HigurashiWhenTheyCry Higurashi]]'' SlasherSmile that creeps Mahiro right the hell out.
* BadBoss: According to Nyarko, her boss is unreasonable and sleeps all the time, and if you disturb his naps he gets mad enough to destroy the universe. Yup, he's Azathoth.
* BeachEpisode: Episodes 6-7 of the second anime.
* TheBeard: In episode 5 of season 2 (W), Kuuko claims to be Mahiro's fiance in order to thwart her cousin Kuune's advances and avoid a marriage interview. The later doesn't seem too convinced at first, so Kuuko asks the other characters to play along, and bribes Nyarko into doing so by giving her the contract Mahiro wrote (while trapped in Nyarko's body) in the first episode.
* BeCarefulWhatYouWishFor: Mahiro in episode 11 moans that he wish he could have peace and quiet. [[spoiler: Then in episode 12, he gets it, and ends up being the last man on Earth, and he starts to realize how important his friends and family really are to him.]]
* {{BFS}}: Nyarko's crowbar turns into one in episode 12.
* BeehiveBarrier: In Episode 10, [[spoiler: Nyarko (in her own body again)]] summons one to block an energy blast from the leader of the rogue Yithians.
* BigBrotherAttraction: In episode 3, Nyarko tries to play both the big and little sister for Mahiro (while [[ActorAllusion channeling some of]] Creator/KanaAsumi's [[ActorAllusion other roles]]), suspecting he has one of these. He angrily denies it.
* BigBookOfWar: The alien characters have Citizen Bright's ''Amazing! Our Space CQC''. Basically, it's summed up as "CQC is what you want it to be, even if others disagree."
* BigNo: Tamao lets one out in Ep. 9, Season 2, after she realizes [[spoiler: that's shes playing ''Twister'' with Yoichi, who just happens to be under her skirt.]]
* BlueAndOrangeMorality: Cuuko would frequently invoke this trope to justify [[LovableSexManiac her promiscuous attitude]] towards Nyarko, including [[DudeShesLikeInAComa stripping off her bikini in the middle of the beach]] while she's suffering from a HeroicBSOD[=/=]ColorFailure after Mahiro [[BrutalHonesty bluntly states that he doesn't like her]] in Episode 7.
-->'''Cuuko:''' "The standards of your world do not apply to us."
-->'''Mahiro:''' "You really want a fight or what?!"
-->(Cuuko whistles away)
* BlueWithShock: Happens to several characters from time to time.
* BodyguardCrush: Nyarko practically begged to take the job of protecting Mahiro after seeing his picture.
* BokeAndTsukkomiRoutine: With Nyarko as the ''boke'' and Mahiro as the ''tsukkomi''.
* BookEnds: Both the first and the last battle take place at the same place. The latter [[CallBack even starts the same way as the former]].
* BorrowedCatchPhrase: Cross-series, with pretty much the entire cast telling someone to "Count up their crimes" at least once. [[DontExplainTheJoke In case you missed it]], the writers really liked ''Series/KamenRiderDouble''.
** Mahiro's "That doesn't make any sense," itself borrowed from ''{{Anime/Doraemon}}'', gets used by a couple of other characters, most prominently Nyarko in episode 2.
* BreakingTheFourthWall: In the first episode of the second TV series, after Mahiro nearly misses her hand with a fork, a freaked-out Nyarko asks if he's trying to get them taken off the air.
** In the ''Nyaruani'' episode "Cooking":
--->'''Mahiro:''' "Wait a minute. Why did you get censored by the broadcast code?" "Why's there a mosiac over that thing you're holding?!"
** [[OverlyLongGag And in the second season's first episode too]]:
--->'''Cuuko:''' "The [[Series/KamenRiderWizard magic circle effects]] were difficult. We're using them now while we still have room in the budget."
*** The first part of this episode combines this with InfoDump as Nyarko addresses the audience directly to get new viewers up to speed, for example giving little introductions for Yoichi and Tamao when the group gets to school.
* BrutalHonesty: "I don't like you", by Mahiro to Nyarko in Episode 7 of the second anime. It was enough to drive the latter into a HeroicBSOD and ColorFailure which Mahiro [[{{Tsundere}} would later have to reluctantly rectify himself]] at the sight of [[DudeShesLikeInAComa Cuuko about to exploit Nyarko's shock to undress her in the middle of the beach]], apologizing to her and then bringing her on a date at Yoriko's suggestion.
* BuffySpeak: When asked about the crowbar she was holding, Nyarko describes it as "some kind of unspeakable bar thing."
* ButThouMust: Spoofed in ''Nyaruani'' episode 5, "RPG", where Nyarko describes the big popular RPG in space. Sometimes the monsters you defeat will want to join your party; your choices are "Yes" or "Yeah". And then they demand payment or refuse to help you.
* CainAndAbel: Nyarko's older brother Nyar-o ran away from home because he's BookDumb while Nyarko is a ChildProdigy (she was a topnotcher at a prestigious university, while he had to drop out of a C-list college). He blames her for his downfall (because she hit his head while playing space gateball) and tries to antagonize her after he gains his own Full Force Form -- [[HarmlessVillain so he wanted to be]].
* CatapultNightmare: Episode 9 opens with Mahiro having one...but, because it's Mahiro, the "nightmare" is the DatingSim ending of the previous episode altered so that he says "I love you" to Nyarko and kisses her willingly instead of being {{Tsundere}} as usual.
* CallBack: In Episode 11, Nyarko uses the Mirror of Nitocris to suck back the Shaggai hornets she intended to eat as barbecue at Mahiro's request. [[spoiler:Then Mahiro remembers that it was the same mirror with which Nyarko let him realize that [[FreakyFridayFlip they have switched bodies]]. Naturally, he's not too thrilled about the implications as to what it could have done to him.]]
* CallingYourAttacks: Isurugi and Isuka do this in episode 10. After a while Mahiro questions if they're grade school kids.
* {{Calvinball}}: Space [=CQC=] is explicitly stated to be whatever one claims it to be. Even if their opponent disagrees.
* TheCameo: Characters from other light novel series, such as ''[[http://ga.sbcr.jp/novel/miyama/01.html Miyamasanchi no Berutein]]'' (written by Aisora) and ''[[http://www.enterbrain.co.jp/product/mook/login_trpg/10392701.html Rl'yeh High School]]'' (illustrated by Koin) can often be seen in the background, with the two main girls from the latter actually appearing as Mahiro's classmates. In turn, Mahiro, Nyarko and Yoriko appeared as minor characters in the former.
* CanonForeigner: By medium:
** {{Yonkoma}}: Nakko, a nightgaunt that got stuck in little girl form and left behind on Earth after the Nodens incident.
** ''Nyaruani'': Nyarue, Nyarko's overly excitable cousin.
** Anime: Guthatan and Roy Fogger from the first season, [[YaoiFangirl Tsuruko]] and the Dreamlands gods from ''W''.
* CantStandThemCantLiveWithoutThem: Basically sums up Mahiro's relationship with Nyarko, Cuuko and Hasta. No matter how often their personalities (and preferences) clash, it's obvious that all four of them need each other. [[spoiler:He learns this lesson at the end of the first season when he's sent to a completely empty world; the second season has a similar situation, where the trio are being recalled by their bosses, but Mahiro's main conflict is the fact that he's powerless to stop it.]]
* CassandraTruth: In Episode 7 of the second anime, Mahiro insists that [[ThatLiarLies Nyarko isn't pregnant with his child]] (after the latter's failed attempt to seduce him at the end of Episode 6) despite the latter's insistence. That doesn't stop Yoriko, Hasta, Tamao and [[NotSoAboveItAll even Yoichi]] from believing her.
-->'''Mahiro:''' "Seriously, why is this happening to me?"
* CatchPhrase
-->'''Nyarko:''' "I'm the Chaos that always crawls up to you with an smile, Nyarlathotep!"
* CaptainErsatz:
** The hero of the Nyarko's favorite {{Toku}} [[ShowWithinAShow series]] ''Kurogane no Striber'' is basically an amalgamation of several different ''Series/KamenRider'' heroes. His hero form primarily resembles [[Series/KamenRiderKuuga Kuuga Ultimate Form]] but with an old-school ScarfOfAsskicking, but overall he bears more similarities to Series/KamenRiderDecade, including the same card-reading TransformationTrinket, {{Borrowed Catchphrase}}s, and his human identity even resembling ''Decade'' star Masahiro Inoue to a degree.
** Guthatan look very similar to R'lyeh Ruru, the heroine of ''Maumi Shoujo R'lyeh Ruru'', with twintails. And by proxy, this mean she most like Cthylla.
* CatSmile: Nyarko and Cuuko display one from time to time.
* ChekhovsArmory: Mahiro {{lampshade|d}}s this trope and at the same time claiming that Nyarko and company would have the resident ChekhovsGun.
* ChekhovsBoomerang
** The "protective charm" Nyarko gives Mahiro from Episode 2[[note]]Which Lovecraft fans will recognize as the Shining Trapezohedron[[/note]] comes back in Episode 10 to [[spoiler:play PocketProtector and save Nyarko-in-Mahiro's-Body]]. It returns again in episode 10 of Season 2, when Mahiro [[spoiler: summons a sick Nyarko]] in a particularly nasty foreshadowing/subversion loop (ultimately [[spoiler: subverted; Nyarko can't fight in her state, and the Yuggoths are vaccinated against her sickness]]). It still has the potential to boomerang back, since its primary purpose is to let Mahiro [[CallOnMe summon Nyarko]] in times of great need.
** The Mirror of Nitocris also becomes this [[spoiler:when, in Episode 12, Mahiro uses it to suck in a Nightgaunt, and was eventually used by Nyarko to move him out of the alternative dimension he is trapped in]].
* ClingyJealousGirl: A few examples.
** Cuuko doesn't like that Nyarko is always swooning over Mahiro.
** Nyarko doesn't like Hasta too much when the latter seems a bit too friendly with Mahiro. Cuuko's attempts to [[ShipperOnDeck hook them up]] only makes things worse, particularly as Hasta doesn't seem to mind it.
** In episode 5 of season 2, Kuuko [[TheBeard pretends]] that Mahiro is her fiance to thwart her cousin Kuune's advances. Although she promises to give Nyarko the contract Mahiro wrote in the first season (while trapped in Nyarko's body), Nyarko is clearly uncomfortable with the plan, and shatters her tea cup after watching Kuuko clinging onto his arm. She also becomes unhappy at the fake date Kuuko goes on with him in the next episode.
** Kuune, Kuuko's cousin, also exhibits this trope in episode 6 of season 2, and tries to thwart their plans from time to time during the fake date.
* ColorCodedCharacters: Human characters can be distinguished by their natural hair color; the Lovecraftian characters have bright color motifs based on their Mythos counterparts. Hasta is yellow (alluding to Hastur's title, the "King In Yellow"), Luuhi is green since she is Cthulhu, and Cuuko is red -- alluding to Cthugha, a sentient fireball. The odd one out is Nyarko, whose hair and HenshinHero form is silver. Nyarlathotep's traditional color is black, though it is used for her standard outfit.
** In ''Remember my Love(craft-sensei)'', Ato-ko's color motif is black, appropriate for a YamatoNadeshiko.
* ColorFailure: Throughout the second anime...
** Mahiro has one near the end of Episode 1 after seeing Nyarko [[CurbStompBattle brutally beat a Nightgaunt to a bloody pulp]] -- beside him his "SanityMeter" is also shown going down the drain -- and again at the end of Episode 3, when Yoriko calls him telling she's coming home.
** Nyarko also has had these moments twice. The first is in Episode 4 when she misunderstood Yoriko's advice to her to start her relationship with Mahiro as JustFriends for being friendzoned before GivingUpTheGhost. The second is in Episode 7 (coupled with HeroicBSOD) after Mahiro [[BrutalHonesty bluntly tells her]] that he doesn't like her. She goes into it again later in the episode to guilt trip him into doing things with her, but he draws the line when she tries to drag him into a sex museum.
--->'''Mahiro:''' [[LampshadeHanging Turning white]]'s not going to work this time.
** Cuuko and Hasta simultaneously in Episode 10 after [[spoiler:Nyarko (in Mahiro's body) gives Mahiro (in Nyarko's body) a ''really deep'' French kiss]]. They remain that way during the entire climax.
** Kuune, Kuuko's older cousin, does this when the former mentions [[spoiler: she's getting engaged to Mahiro.]] It must have been shocking, as Kuune is still whited out a few scenes later.
* ConflictBall: The trio's reactions to Guthatan in episode 11 fringe on this, Nyarko especially. While Mahiro is trying to look after this child who was put in his care, the trio acts [[TookALevelInJerkass even more selfish and disruptive than normal]], with Cuuko is needling Mahiro about breakfast while Nyarko and Hasta get insanely jealous of the attention he's giving Guthatan. Probably the worst of it is when Nyarko notices that Guthatan's hair is wet and she's in new clothing[[note]]Mahiro had to bathe her after she got her clothes dirty in the kitchen[[/note]] and jumps to the conclusion that ''Mahiro had sex with the underage alien girl''. You can kind of understand his anger at that point.
* ConservationOfDetail: The main characters muse that [[spoiler:Yoichi must be possessed by a Yithian because he hasn't come to school]]. When they go check on him, they turn out to be absolutely correct.
* ConversationalTroping: In Episode 10 of ''Nyarko-San W'', Nyarko ([[Literature/TheWarOfTheWorlds who's caught a human cold because she isn't immune to it]]) explains that even powerful aliens can have {{Weaksauce Weakness}}es, like tomatoes[[note]]A ShoutOut to the Japanese movie ''Daijobu My Friend''[[/note]], moon rocks[[note]]''Giant Space Monster Girara''[[/note]], and [[Film/MarsAttacks music]]. [[spoiler: The ''Mars Attacks'' reference becomes a ChekhovsGun when Nyarko's ringtone -- an alien pop song -- causes the MonstersOfTheWeek's [[YourHeadAsplode heads to explode]].]]
* ContentWarnings: Used in "Remember my Love(craft-sensei)", accompanied by dramatic music. Each episode begins with one, followed by some NonSequitur:
-->''ATTENTION PLEASE!! When watching animated shows, please make sure the room is well-lit and do not sit too close to the screen. Also, there's not much movement.''
* CoolCar:
** Luhy's blatant ShoutOut ''Film/BackToTheFuture'' time travelling [=DeLorean=] DMC-12.
** Nyarko's submersible Nephren Car, complete with multiple torpedo launchers.
* CPRCleanPrettyReliable: Mahiro drowns after being accidentally ejected off Nyarko's underwater CoolCar but is eventually rescued off-screen. Reviving him is best described as... Hasta's FirstKiss.
* CrashIntoHello: Hasta bumps into Mahiro while lost and looking for Mahiro's house. [[LoveAtFirstSight Sparks fly!]] ([[IncompatibleOrientation in one direction]])
** Mahiro does it to Nyarko in Episode 8, even though they've known each other from the start. It hints at [[TrappedInTVLand what just happened]], parodies the trope and is a ShoutOut to ''Anime/NeonGenesisEvangelion''.
* CrazyPrepared
** Mahiro keeps a fork in his pocket, for whenever Nyarko is going wild over him.
** [[spoiler:Isurugi, the renegade Yithian, prepared a Space CQC Jammer to combat Nyarko. Isuka, the Yithian on Nyarko's side, prepared a Space CQC Jammer Canceler. Countered by a Space CQC Jammer Canceler Breaker, then by Space CQC Jammer Canceler Breaker Eraser... and so on and so forth. Even though Isurugi eventually wins out, things still do not go according to plan.]]
--> [[spoiler: '''Mahiro:''' [[LampshadeHanging What is this, a kid's fight?]]]]
* CreatorCameo: That little ghostly devilfish that sometimes appears in monstrous crowds or flying quickly across the screen is Aisora's avatar.
* CreditsRunningSequence: Mahiro does a brief one running in place with a giant Nyarko and Earth in the background in the opening for W (season 2). He also does one where he's running away from Nyarko, Kuuko, and Hasuta.
* CrossdressingVoices
** [[OnlySaneMan Mahiro Yasaka]] is voiced by Creator/EriKitamura.
** [[AdorablyPrecociousChild Hasta]] is voiced by RieKugimiya -- a [[DudeLooksLikeALady male (albeit effeminate)]] role and a [[NiceGuy sweet, cuddly]] [[PlayingAgainstType departure from]] the {{Shana Clone}}s she's [[PigeonholedVoiceActor used to voice]].
* CryCute
** Nyarko, energetic she may be, frequently breaks down into a tearful mess for whenever Mahiro gives her the cold shoulder (or, depending on circumstances, the fork).
** The only time Cuuko becomes tearful is whenever she misses the Xoth-731, a game console she loved so much. It also doesn't help that she had to reluctantly terminate it after it brainwashed a bunch of Deep Ones with a ZombieApocalypse game.
** In Episode 7, poor Hasta (voiced by RieKugimiya, no less) storms off the cafeteria crying when he thought Nyarko is pregnant with Mahiro's child, despite the latter's insistent (and truthful) denial.
** Finally, in Episode 10, [[spoiler:Mahiro himself (albeit in Nyarko's body) sheds TearsOfRemorse when he thought Nyarko (in his own body) died shielding him from the Star Child Guardian's beam attack, lamenting that he should've been nice to her, who's always been more than willing to risk life and limb for his sake. Of course, she's alive ([[ChekhovsBoomerang the black crystal Nyarko gave to him back in Episode 2 certainly saw to that]]), but only played dead to have him come close to her and receive a ''really deep'' French kiss]].
** Kuune, Kuuko's cousin, does this in episode 5 of season 2 after the latter claims she'll do ThisAndThat with Mahiro to prove she's [[TheBeard in love with and marrying]] him.
* [[MacrossMissileMassacre Cthulhu Torpedo Massacre]]: The Nephren Car holds unspeakable amounts of underwater warfare munition.
* CulturalCrossReference: ''TabletopGame/CallOfCthulhu'' blatant {{Shout Out}}s are quite surprising when you consider they are jokes about a classic, but not "mainstream", Western tabletop RPG.
* CurbstompBattle: Well, this is what happens when you pit mere monsters against the Crawling Chaos.
* DamnedByFaintPraise: In episode 7, Mahiro attempts to apologize to Nyarko for saying he didn't like her, but the best he can manage is to say that he likes her better than certain foods (which, as Tamao [[LampshadeHanging points out]], ''nobody'' likes). But it's good enough for Nyarko.
* DancingTheme: A brief one in W's (season 2) opening by various characters.
* DateCrepe: Mahiro and Kuuko order some in episode 6 of season 2. When Kuuko tries to take a bite out of his crepe, her cousin Kuune shows up from behind the bushes and eats the entire thing in one bite. So she shares her crepe with him, and when he takes a bite out of it, Kuune becomes extremely upset.
* DatePeepers: Kuune, Nyarko, Hasuta, Shantak, and Mahiro's mom all follow him and Kuuko on their date in episode 6 of season 2. Then it turns into more of a group outing while at the restaurant as they all join the two for lunch.
* ADateWithRosiePalms: [[spoiler:When Nyarko accidentally switched bodies with Mahiro in Episode 9, she spends an ''inordinarily'' long time in the restroom, then comes out radiantly singing "Oh, boys are so great... It's a feeling that girls just won't understand..." Naturally, Mahiro is ''livid'' about this.]]
** In episode 7, we see Cuuko apparently stayed up all night waiting for Nyarko (who lied in order to get her out of the way), and slept through breakfast while having some...entertaining dreams. Later, when Mahiro asks her why she missed breakfast, Cuuko said she was waiting for Nyarko but "somehow ended up satisfying [herself]". Wisely, Mahiro decides not to ask any further questions.
** In Episode 2 of Season 2, Kuuko is shown groping herself while reading out loud from a book that, if not explicitly sexual, certainly sounds suggestive.
* DatingSim: ''[[LovePlus Lovecraft Plus]]'', mentioned in the fourth episode of the short Flash, is an inverted version of the standard dating sim that happens to have [[SanityMeter SAN]] [[TabletopGame/CallOfCthulhu among its stats]]. Instead of getting the girls to fall for you, the girls try to get ''you'' to fall for ''them'' Your SAN points are basically your resistance to the {{Yandere}} StalkerWithACrush's advances. Lose enough SAN and you end up with her forever, wallowing in your mutual insanity. Definitely a game worthy of the title.
** This is also the premise of [[TrappedInTVLand Episode 8]]. The characters are stuck in ''Doki Doki High School'' until Mahiro scores with either Nyarko, Cuuko, Hasta or Tamao.
* ADayInTheLimelight: Shanta-kun gets one in episode 8 of season 2, [[spoiler:when she [[HumanityEnsues becomes a little girl]] thanks to Kuuko.]]
* DeadPetSketch: One episode of the Flash series plays with this. Cuuko feeds ''something'' to Mahiro's goldfish. Mahiro becomes angry, [[spoiler:but [[ComicallyMissingThePoint being an alien, Cuuko doesn't realize that fish shouldn't have spouted legs]]]].
* DeepImmersionGaming: Episode 8, where all of the main characters get sucked into a DatingSim game.
* DesertedIsland: In episode 7 of season 2, Nyarko tells Mahiro that they're both stranded on a deserted island after he awakens from having fallen in the water. [[spoiler: However, as soon as he points out they're still inside the swimming park, several people walk by, and the camera changes angles to show the shops on the other side of where they are.]]
* [[DidYouJustPunchOutCthulhu Did You Just ]]GroinAttack [[DidYouJustPunchOutCthulhu Cthulhu?]]: A Nightgaunt, actually. A subversion, since Nyarko's an Outer God, in the form of a schoolgirl. Played straight with Mahiro who frequently threatens Nyarko with a ''fork''.
* [[DidYouJustRomanceCthulhu Did You Just Romance Nyarlathotep?]]: For her, it was LoveBeforeFirstSight. Mahiro's case is different; he's obviously attracted to her, but acts {{Tsundere}} because she's too ManicPixieDreamGirl for his tastes and because he's afraid that she's lying about her feelings to screw with his head -- like the original Nyarlathotep would probably do. He does get better over the course of the novels, though.
* DisneyDeath: [[spoiler:Nyarko in Episode 10. She's actually fine -- [[ChekhovsBoomerang the black crystal she gave to Mahiro back in Episode 2]] saw to that]].
* DisneyDogFight: ''Nyaruani'' episode "Loyalty" has Nyarko getting jealous over how much Shanta-kun seems to like Mahiro; he responds by suggesting they do this. Shanta ends up choosing Nyarko...after some percussive persuasion.
* DisproportionateRetribution: In episode 10, the Yith, or at least an extremist, space MoralGuardian cult of them, wish to destroy Earth because they're corrupting morals of space aliens with Earth's entertainment.
** Ghutatan's butler in episode 12 wants to get rid of Mahiro because the latter made it hard for him to get his hands on {{Eroge}}.
** In the light novels, Nyarko and Cuuko used to beat up their grade-school classmate Nyogta for bullying Hasta; as an adult, he gets his revenge by [[spoiler:erasing the girls from existence.]]
* DistractedByTheSexy: Nyarko uses this against Cuuko in episode 6 by throwing out some pictures and claiming pictures of her in a swimsuit flew out. This distracts Cuuko long enough for Nyarko to hit her with a finishing blow. Said pictures were actually of Mahiro taken from various angles.
* DoItYourselfThemeTune: Creator/KanaAsumi [Nyarko] sings the themes of all three adaptations -- solo on the first Flash opening ("Like, Like, Love") and the anime ending ("Always Be With You"), collaborative on the second Flash ending ("Catharsis of a Woman's Love", with Azusa Kataoka [Atko] and Sayuri Hara [Nyarue]) and the anime opening ("The Sun Says 'Burn, Chaos'" with MiyuMatsuki [Cuuko] and Yuka Ootsubo [Tamao]).
* DontExplainTheJoke: In episode 5 of the first TV series, Mahiro chasizes Nyarko for having to spell out the pun behind the Xoth game console's name.
* DopeSlap: Mahiro on Nyarko many, many times. In episode 2 of ''Nyarko-San W'', he takes a page from [[Series/KamenRiderDouble Akiko Narumi]]'s playbook and uses a green slipper.
* DoubleEntendre: Believe it or not, Hasta uses the crap out of this. Most of the time he uses the term "gattai"[[note]]"Combine," frequently used for CombiningMecha[[/note]] to refer to doing it; this is not a corruption as the term '''can''' mean such an act. However, all bets are off when he refers to it as "[[Anime/GaoGaiGar Final]] [[GratuitousEnglish Fusion]]."
* DoubleStandard: In Episode 9, Cuuko cries foul when Nyarko fawns over Mahiro [[{{Megane}} wearing glasses]], but brushes off Cuuko's attempts to use some {{Meganekko}} charm on her.
-->"[[SayingSoundEffectsOutLoud Sniffle.]] [[GratuitousEnglish Double standard...]]"
** A gender-based one, in Episode 7 Mahiro made it very clear to Nyarko that he wasn't interested in her and she finally took it seriously. So how did everyone respond? By pressuring Mahiro to take her out on a date. Admittedly Nyarko was shocked and saddened when Mahiro told her, but if the genders had been reversed the scene would have been considered very creepy.
* DoubleStandardRapeFemaleOnMale: Not outright rape, but Nyarko's repeated attempts to seduce Mahiro (presumably in the hopes that he'll [[NotIfTheyEnjoyedItRationalization get into it]]) are treated as comedy, when the same acts committed by a man on a woman would most certainly not. It might have something to do with the fact that you know Nyarko will '''never''' succeed, thanks to Mahiro's skill with forks.
* DraggedByTheCollar: Nyarko likes to grab Mahiro and run with him in tow.
* DramaticChaseOpening: The second anime series begins with Mahiro being chased by a nightgaunt.
* DynamicEntry: Episode 11 of ''Nyarko-san W'' sees Nyarko do this -- with the [[Series/KamenRiderFourze Rider Rocket Drill Kick]], no less -- to stop a LovePotion-ed Cuuko from getting busy with Mahiro.
* EarCleaning: Kuuko does it to Mahiro in the beginning of episode 6 of season 2. Kuune and Nyarko, who are both watching from nearby, are [[ClingyJealousGirl not pleased with it.]]
** Especially when Cuuko drops the pick and leans over to retrieve it, [[MarshmallowHell putting her breasts right on Mahiro's head]].
* ExternalRetcon: For the Cthulhu Mythos.
* FacelessGoons: Nightgaunts.
* FamilyFriendlyFirearms: The "guns" Isuka and Isurugi use in episodes nine and ten resemble old handheld cameras, or radar guns. The characters still react to them as real guns however, such as when Isurugi, while inhabiting Yoichi's body, points the gun at his own head.
** The camera appearance is based on the description of Yithian weapons from ''The Shadow Out of Time'', which could be quite deadly.
* FanService: The {{Light Novel}}s are illustrated by the artist who did ''LightNovel/{{Kanokon}}'''s, so one should expect it. Invoked in the first TV episode with Nyarko telling Mahiro that since [[MediumAwareness this is an anime adaptation]], their fans surely want to see them get wet. Mahiro flatly rejects it, claiming that he doesn't care about that kind of fan.
* FastForwardGag: In the first episode of the second anime series, Nyarko's explanation for who/what she is and her purpose for being on Earth gets fast-forwarded due to being extremely long-winded and Mahiro has to summarize everything in a format that the audience can understand and respects broadcasting time constraints.
** Even funnier, if you slow down that sequence to half speed, you can understand Nyarko's dialog; it's an almost direct quote from the original light novel where she (indirectly) reveals that her boss is Azathoth.
* FeudingFamilies: As a race, the Nyarlothotepians and Cthuguans are mortal enemies, with Cuuko's crush on Nyarko being a case of IfItsYouItsOkay. When Cuune shows up, Nyarko explains to Mahiro that the shame and dishonor that would result if the crush became public would probably destroy Cuuko's family.
* FictionalGenevaConventions: In the "Cooking" segment of ''Nyarani'', Nyarko mentions difficultly of getting an "ingredient" due to the Space Washington Treaty.
* FightingAShadow: Conversed in episode 1 of the second season, as Mahiro and Nyarko talk about their compatibility issues. Mahiro points out that Nyarko (as a beautiful human girl) is not her true form. However, Nyarko counters that her human form is just one of her Thousand masks, so it's just as real as can be.
--> '''Mahiro''': "I'm scared to see the remaining 999."
* FlashbackEcho: In a few episodes, Mahiro blushes and gets really flustered whenever he gets a good look at Nyarko's lips -- because he's remembering the two times they've actually kissed so far.
* {{Foreshadowing}}: Occurs in Episode 5. Mahiro tries to figure out why Yoriko was taken by Luhy. He thinks it has something to do with "sononium", which he thought was merely her excuse to hug him. [[MistakenForEvidence Turn's out he was mistaken]]. [[spoiler: The ''real'' foreshadowing was his mother discussing how [[GamerChick she collects old video game consoles]].]]
-->'''Mahiro:''' "''That'' was the foreshadowing?!"
** This gets invoked again in episode 9 of season 2 regarding the vacuum cleaner Mahiro's mom is using throughout the episode, as well as events that happened in an earlier episode with Kuune. Both Mahiro and Nyarko comment on said vacuum, which did nothing in particular aside from screaming "Cyclone!"
** It comes into play again during episode 10 of season 2. The latest alien threat seems ready for anything Mahiro, Kuuko, and Hasuta can throw at him, and then they all fail for one reason or another. [[spoiler:Then Nyarko's phone begins to ring, and its the music from it that causes them to die. Mahiro [[LampshadeHanging immediately points out]] that it wasn't much of a foreshadowing clue.]]
** Mahiro's actually gotten to the point where he's actively trying to find the foreshadowing in every plot arc. He always chooses whatever he thinks would result in the dumbest, most nonsensical ending, and while he's right in that regard, he still tends to be wrong because something always [[DidntSeeThatComing comes out of nowhere]] that's ''[[SerialEscalation even dumber]]'' than what he suspected.
* ForkFencing: Mahiro and his mom use forks to keep Nyarko, Kuuko, and Hasuta in line when they act out. Despite having weaponry that's literally out of this world, the forks seem to be the most feared thing to them anytime he pops one out.
** In episode 3 of ''Nyarko-San W'', Mahiro gets so annoyed with the combined Zhar/Lloigar to start flinging forks; he starts screaming in pain, and Nyarko says that "for some reason", Mahiro's forks hurt a ''lot''.
* AFormYouAreComfortableWith: Mahiro tells Nyarko he pictured Nyarlathotep far more monstrous. She offers to show him some of her other forms... if he doesn't mind losing his sanity. Mahiro passes. Cue a shot of twenty [[SanityMeter SAN Points]] getting dashed off of a ''TabletopGame/CallOfCthulhu'' character sheet.
* FourthWallMailSlot: Spoofed in episode 5 of ''Nyaruani'', where Mahiro and Nyarko answer fans' questions about the series. The first question is about a SeriesContinuityError[[note]]"Why is lunch after third period in the first light novel, but after fourth period in the GA Magazine short?"[[/note]] which annoys Nyarko so much that she rips up the postcard and ends the segment there...but still says "ToBeContinued" afterwards.
* FreakyFridayFlip: [[spoiler:When Isuka, a Yithian (currently in Tamao's body), fails to take over Nyarko's body, this happens to her and Mahiro. [[FirstLawOfGenderBending The device of course runs out of power immediately]].]]
* FreezeFrameBonus: In episode 8 of the second season (the TrappedInTVLand DatingSim episode), Nyarko's Christmas present to Mahiro is a marriage registration. Reading it reveals a lot of amusing details; for example, Nyarko's birthday is April 15, 2009 (the day the first light novel was released), her parents are Father of the Million Favoured Ones and the Bloated Woman (two of Nyarlathotep's other forms), and one of the marriage witnesses is Harvey Walters, the sample character in the 5th edition of ''TabletopGame/CallOfCthulhu''.
** In the ''Nyaruani'' episode "RPG", Nyarko's description of the game is accompanied by mental images of the game; the monsters who [[DefeatMeansFriendship ask to join]] are [=iTunes=], Quicktime, and Bonjour (as in, the program icons with little eyes drawn on).
* FunnyBackgroundEvent: The Flash series feature this often.
* GagSeries: The Flash series focused on surreal humor more than any plot. The TV series probably falls halfway between this and ExcusePlot.
* {{Gainaxing}}: Kuune does this when she's walking slowly towards Mahiro and Nyarko in episode 9 of season 2.
* GenderFlip: Nyarko, Cuuko, and Luuhi. In the Mythos, Nyarlathotep's human forms tend to be male, and Cthugha and Cthulhu are considered "male".
** On the meta side, Atlach-Nacha was originally described as male, though later writers turned "him" into a female.
** Another, anime-related meta example: Mahiro is {{tsundere}}, helpless against monsters, but has no problem with hitting Nyarko; Nyarko is bold, hyperactive, and is easily beaten by Mahiro despite being powerful fighter. In other words, they're the gender-flipped version of the standard anime couple.
* GlamourFailure: Humanoid Nyarlathotepians can be distinguished from regular humans (and other anthropomorphized Lovecraftians) by their silver hair and huge cowlick, most prominent of which are Nyarko, Nyar-o and Nyarue.
* GodivaHair: Nyarko sports this pretty much any time she's nude; they even make it so her hair magically falls in the right place to cover her butt in episode 1.
* GoMadFromTheRevelation: When Mahiro first meets Nyarko, he wonders why she [[AFormYouAreComfortableWith looks like an average human girl]], and not an EldritchAbomination. She mentions that she could go into that form if he really wants her to, but wisely decides against that due to this trope.
* GoroawaseNumber: Tsuruko says that her favorite number is 801 -- [[YaoiFangirl Ya-O-I]].
* GrandTheftMe: Focus in the third LightNovel volume. [[spoiler:One such Yithian, Isuka explains to Nyarko that her more aggressive kin are trying to pull this off on humanity in order to learn more of their entertainment. In an attempt to take over Nyarko (ostensibly to be able to fend off her more aggressive kin), she ended up causing Nyarko and Mahiro to [[FreakyFridayFlip switch bodies]].]]
* GratuitousEnglish: All over the place. Nyarko herself is a serial offender.
* GroinAttack: Nyarko does this to one of the nightgaunt in episode 1. Even Mahiro [[ShareTheMalePain kind of empathizes]] with it after she attacks there.
** Even worse, she used [[Series/KamenRiderKuuga Kuuga's Mighty Kick]] to do it.
* GroundhogDayLoop: [[spoiler:Episode 11 ends with Mahiro trapped inside one, waking up once more on the Sunday he chewed out Nyarko, Cuuko and Hasta for being too violent while dealing with a bunch of Shoggoths, accidentally wounding their guest, Ghutatan, in the process. Then it was revealed that Lloigor, Ghutatan's butler, planned it all along to remove him, the last obstacle to gaining every eroge in the world.]]
* GutFeeling: In episode 3, Nyarko says "[[Film/StarWars I have a bad feeling about this...]]" (and Mahiro agrees) when Tamao says a new student is joining their class: a cool girl with fiery twintails and A-cup breasts. Of course, it turns out to be Cuuko. By episode 5, they've gotten even savvier, and have the same exchange when Hasta leaves; sure enough, he turns up at school the very next day, prompting both to mutter "IKnewIt..."
* HamToHamCombat: Isurugi and Isuka have one when they constantly try to cancel each others field.
** [[http://www.youtube.com/watch?v=x8cAv_gl6dk Nyarko and the vacuum.]]
--> "JOKER!"
--> "CYCLONE!"
* HaremGenre: Played with. Mahiro is a high school boy who lives with three love interests, but only one of them, Nyarko, is a viable romantic option ([[{{Tsundere}} one he angrily rejects]]). Of his other freeloaders, Cuuko [[IncompatibleOrientation only has eyes for Nyarko]] initially, and Hasta [[CuteShotaroBoy is male]].
* {{Harmless Villain}}s: Both Nodens and Nyar-o went down with extreme anticlimax.
* HauntedHouse: Several of the characters visit one in episode 11 of season 2.
* HeelFaceTurn
** Cuuko, [[SpoilerOpening obviously]]. It took Mahiro playing around her PsychoLesbian crush on Nyarko to convince her to let go of him and even win her over as a mutual ally by (purportedly) helping her get Nyarko.
** Luhy has bounced back from her VillainousBreakdown when she was laid off by Cthulhu Corp. and has since taken many jobs, ranging from a takoyaki vendor to a MagicalGirl at a stage play (with Nodens, who also seemingly pulled this off as a {{Kaiju}}), [[spoiler:and later a teacher at Boryo High]].
** [[spoiler:In Episode 10, Isurugi, the rogue Yithian [[GrandTheftMe possessing Yoichi]], upon discovering that his boss is actually a [[SpaceX Space]] [[MoralGuardians Moral Guardian]] who infiltrated his faction for his own agenda.]]
* HeroicBSOD:
** PlayedForLaughs in Episode 7 by Nyarko (coupled with ColorFailure), when Mahiro [[BrutalHonesty bluntly tells her he doesn't like her]]. It took the sight of Cuuko [[DudeShesLikeInAComa about to exploit the chance to molest Nyarko]] to make Mahiro reconsider his stance, apologize to her and take her on a date.
** Played straight in episode 6 of season 2, when Nyarko becomes extremely upset at the fake date between Kuuko and Mahiro. After she complains about it, he tells her she should just go home if she's not comfortable seeing their playacting in order to fool Kuuko's cousin Kuune. Nyarko becomes downcast for the rest of the day and evening, and ambushes him in his room later that night with an AnguishedDeclarationOfLove.
** Nyarko suffers another one during the first half of episode 12 in season 2, after learning that her, Kuuko, and Hasuta's job of guarding Earth was done since they got the guardian for Earth done way ahead of schedule (it was supposed to take about 500 years to complete, but they managed to do it overnight). She is also told that staying on Earth any longer would be considered a crime, and Mahiro tells her he can't do anything about it either. [[spoiler:She snaps out of it the instant she hears that they want to field test the new guardian, with the intention of destroying it so as to be allowed to stay on Earth while her superiors have to build a new guardian.]]
** In season 2, when Cuuko kisses Mahiro on the cheek (which is considered a major love ritual by her race), Cuune flips out, quotes the BigBad of ''Manga/MobileSuitCrossboneGundam'' ("Burning...the Earth is burning...") and flies off while laughing maniacally.
* HighPressureBlood: Mahiro's fork-stabbings make Nyarko gush blood in the light novels and ''Nyaruani'' shorts; in the TV series the worst they do is little lumps on the head.
* HighPressureEmotion: Cuuko's full body blushing is actually harmful. Justified, considering she is a living fireball.
-->'''Nyarko''': "Stop hugging me! You wanna burn me to death or what?!"
* {{Homage}}: In the first Flash animation series, Atoko and Nyarko re-enact the silent elevator ride from ''Anime/NeonGenesisEvangelion''.
** Episode 12 of the second TV series contains several direct homages to the second ''Anime/UruseiYatsura'' movie, [[spoiler:which was also about people being transported into a world with no other humans, as well as an apparent GroundhogDayLoop]]. This includes several shot-for-shot recreations of the latter, [[spoiler:including the RedHerring scene of Guthatan sitting nearby a bank of pay phones which ring as Mahiro attempts to call Nyarko]].
* HotSpringsEpisode
** Episode 5 of second Flash series downplays this trope. [[ComicallyMissingThePoint The camera was focused on bathing Shantak-kun for whole episode]], so the audience couldn't see anything despite all the naughty dialogue. Atoko even {{lampshaded}} that she felt bad for deceiving the audience.
** Happens for real in Episode 6 of the TV series, [[MythologyGag complete with Shantak-kun bathing scene]] with Aisora's AuthorAvatar next episode.
* HenshinHero: Being Nyarlathotepian, Nyarko can transform into ''Full Force Form'' and her pet Shantak-kun will become [[CoolBike Machine Shantaker]] via [[Series/KamenRiderDecade Final Form Ride]]. Pretty much a ShoutOut to the Franchise/KamenRider series.
* HumansAreSpecial: On top of Earth's entertainment, humans are also sought after by aliens.
* HypocriticalHumor:
** In the second episode of the second anime, Nyarko complains that Cuuko's lasers shouldn't be considered close-quarters-combat. At the beginning of the episode, Mahiro raised the same point about her using hand grenades.
** Many of Nyarko's frequent insults towards Cuuko revolve around her hobbies, like gaming... In the first episode she was drooling over an anime/manga store's entire stock, including the games.
*** Nyarko's entire relationship with Cuuko is almost exactly the same as the one Mahiro has with her: an entirely unwanted admirer with extreme PerverseSexualLust who wants to make babies. Often, she'll even hit Cuuko with the same insults that Mahiro threw her way just minutes before (which Mahiro will [[LampshadeHanging Lampshade]]).
* IAlwaysWantedToSayThat: In the Next Episode preview for episode 10 of the second TV series, Nyarko takes advantage of [[spoiler:having Mahiro's voice (and body)]] to shout "[[Anime/MobileSuitZetaGundam I'll destroy that kind of adult, philistine!]] [[Anime/MobileSuitGundam00 Sniping the target!]]"; Mahiro stops her before she can say "[[Anime/MazingerZ Pilder On!]]"
* IAteWhat: In Luhy's seaside restaurant, the gang is enjoying her takoyaki. Mahiro was also about to reluctantly eat some... [[MomentKiller then he saw the restaurant's banner with an image of Cthulhu]]. Needless to say, he lost his appetite.
* IconicLogo: The Yellow Sign can be seen in several places related to Hasta (particularly the first TV series' opening). The Elder Sign can also be seen occasionally.
* IdiotHair: All Nyarlathotepians have one, pretty much a replacement of tentacles.
* IfItsYouItsOkay: Even if it's actually Mahiro in Nyarko's body, Cuuko would still attempt to have her way with him, so long as it's Nyarko's body. The fact that Mahiro is relatively easy on her compared to Nyarko also helps.
-->'''Cuuko:''' "Just her [i.e, Nyarko] body will do."
** Kuuko gives Mahiro a kiss to thwart her cousin off in episode 9 of season 2. He later asks if that was okay, since Kuune said that particular kiss was an important love ritual. She says that she didn't mind doing it because it was him.
* IfWeGetThroughThis: Referenced in the last (regular) episode of ''Remember my Love(craft-sensei)'':
-->'''Nyarko:''' Mahiro-san, when I get back, let's have lots more fun together, okay?\\
'''Mahiro:''' Hey, don't go [[TemptingFate setting]] [[EventFlag flags]] like that!
* [[IHaveNoSon I Have No Brother]]: Nyarko ''really'' doesn't want to admit that Nyar-O is her older brother, and when Mahiro questions this she quickly changes the subject.
* ImAManICantHelpIt: In episode 4 of ''Nyarko-san W'', Nyarko ''[[InvokedTrope hopes]]'' that even a NiceGuy like Mahiro might feel the [[Series/JukenSentaiGekiranger boiling power of the beast which makes him "Beast On" and pull her into an ally to demonstrate his Extreme Fantastic Technique]] on her. He quickly tells her it ain't happening.
* ImmodestOrgasm: Shanta-kun in [=S2E2=], Cuuko three episodes later.
* InAnotherMansShoes: [[spoiler:The FreakyFridayFlip has minor elements of this, particularly the bath scene where Mahiro muses on how Nyarko fights to protect him without hesitation despite having such a delicate-looking body, which makes him resolve to be nicer. The only thing Nyarko gets out of it is [[ManIFeelLikeAWoman an intimate understanding of Mahiro's body]].]]
* [[IncompatibleOrientation Incompatible Everything]]
** Cuuko would [[LovableSexManiac love to jump on Nyarko]] if she has the chance. Never mind that they are both girls, and that cthughans and nyarlathotepians are mortal enemies and different species, much less that Nyarko [[NoGuyWantsToBeChased tries her darndest to get her off her back]], she's more than willing to [[PsychoLesbian do just]] [[{{Yandere}} about anything]] just to win her over. Mahiro managed to use her own personality to win her over as an ally.
** Hasta reveals to Mahiro in Episode 5 that he once gave him CPR after nearly drowning while traveling to R'lyeh, and that [[DoesThisRemindYouOfAnything it was his first time]] (cue Mahiro [[SurvivalMantra insistently telling himself that it doesn't count as a kiss]]) then tells him "I love you." Needless to say, Mahiro is clearly perturbed by the implications, but nevertheless plays along with him. It also helps that Hasta looks like [[DudeLooksLikeALady a ridiculously effeminate]] [[AdorablyPrecociousChild young boy]].
* IncrediblyLamePun: In episode 2 of ''Nyaruani'', Nyarko's computer has 出る (meaning "to go") on the back -- which is pronounced "''deru''".
* InsideAComputerSystem: In ''Nyaruani'', Mahiro tries out a alien JRPG. Much to his chagrin, he ends up being transported within the game.
* InstantBandages: Nyarko gets these when Mahiro whacks her on the head. They vanish again moments later.
* IntimateHealing: Kuuko sucks on Mahiro's finger in episode 5 of season 2 after he cuts it from a WhamLine she asks him.
* KillItWithFire: Mahiro's reaction to seeing Nyarue's true form is ask "Just tell me if this is combustible or noncombustible?". Nyarko says she definitely isn't. Note that [[IncrediblyLamePun the word for "combustible" they use is]] "''{{moe}}''ru".
* KissingCousins: Since Nyarko, Cuuko, and Hasta all claim to Mahiro's cousins, their romantic entanglements ''look'' like this to outsiders...and so far, nobody seems to care.
* KlingonsLoveShakespeare: Earth is the gold mine of the universe entertainment industry. Our {{manga}}, especially ''[[{{hentai}} that]]'' kind, are restricted goods.
* LargeHam: The "Cyclone" vacuum in episode 5 of season 2, bonus points for being voiced by NorioWakamoto.
* LaserGuidedAmnesia: At the end of the TrappedInTVLand episode, it seems the only person who remembers anything is Mahiro. It's implied that Nyarko does as well, since she was looking at him and smiling a lot, but refused to say [[FirstKiss why]] when he asks.
* LateForSchool: Nyarko does this in episode 8, complete with toast in her mouth when she does a CrashIntoHello on Mahiro.
* LeaningOnTheFourthWall: Episode 3 of ''Nyarko-San W'' has Nyarko trying to make it sound like this is the end of a TV show (shouting "Our battle has only just begun!", or [[SeparateSceneStorytelling making it look like the story is being told by an old Nyarko to her grandchildren]]. It ends when they cut to show a SuperDeformed Mahiro and Nyarko recording their dialog in the studio and SD Mahiro throws his copy of the script at SD Nyarko's head.
* LighterAndSofter: In the LightNovel and first Flash series, Nyarko actually bleeds when stabbed by Mahiro's fork. The TV series uses InstantBandages instead.
* LightningGlare: Nyarko and Kuuko do this to each other when they both spot the last copy of a limited edition game in episode 8 of season 2.
* LongTitle: The title of ''Remember my Love(craft-sensei)'' episode 9 is *deep breath* "How Mahiro Came to Love the Girl Despite Being a Normal High Schooler Who Cannot Even Sense in the Slightest That the Universe Is at Risk of Destruction, and Suppresses a Vague Worry That Tomorrow the Sun May Not Rise from the Same Direction or at the Same Speed or Even Shine at the Same Luminance and Follow the Same Orbit".
* LoopholeAbuse: In episode 12 of season 2, Nyarko is told that her superiors finished building Earth's new guardian way ahead of schedule, finishing it overnight instead of taking the estimated 500 years to complete. As a result, she, along with Kuuko and Hasuta, are ordered to return to space, and Mahiro says he's just an OrdinaryHighSchoolStudent, so he can't do anything to help them. As they tour the area where the guardian was built, Nyarko overhears her superiors mentioning a field test for the guardian to ensure its working correctly. She, along with Kuuko and Hasuta, instantly decide to volunteer for it, reasoning that if they could defeat the guardian, it wouldn't be able to actually guard Earth. In reality, the three just wanted an excuse to bash the thing so they could then stay with Mahiro longer.
* LoveBeforeFirstSight: Nyarko fell hopelessly in love with Mahiro the moment she saw his picture.
* LovecraftLite: It's a comedy featuring the Crawling Chaos as a silver-haired hyperactive teen girl. This shouldn't be hard to figure out.
* [[LoveDodecahedron Love Trapezohedron]]: Nyarko is madly in love with Mahiro, [[{{Tsundere}} who claims he doesn't like her]] and/or doesn't want to date an EldritchAbomination. Cuuko is also madly in love with Nyarko, [[IncompatibleOrientation gender issues]] and [[DatingCatwoman racial animosity]] notwithstanding, and develops feelings for Mahiro over time. Hasta also likes Mahiro, but they're the same gender and [[StupidSexyFlanders Mahiro is not sure how to react]], though he also [[BiTheWay admits to feeling the same for Luhy]], who may or may not also feel the same. Tamao has an [[AllLoveIsUnrequited unspoken crush for Mahiro]], but [[IWantMyBelovedToBeHappy relents in favor of Nyarko]]. It just gets crazier from there.
* LoveEpiphany: Kuuko has one in episode 5 of season 2, largely because of what a NiceGuy Mahiro has been to her, particularly after he agreed to help her get rid of her cousin Kuune.
* LoveHurts: Nyarko becomes [[ClingyJealousGirl extremely jealous]] during Mahiro's fake date with Kuuko in episode 6 of season 2. After she complains to him privately that she's not happy seeing it, he tells her to go home, causing her to suffer another HeroicBSOD, and causing her to deliver an AnguishedDeclarationOfLove to him later that night.
* LovePotion: In episode 11 of ''Nyarko-San W'', Nyarko's friend Atoko sends a box of chocolates which she shares with everyone (except Mahiro, who refuses). A short while later, everybody seems to have hiccups, and the next thing you know Mahiro is being pursued by everyone except Nyarko, who's herself trying to escape from an obsessed Luhy. One phone call later, Nyarko learns that there was a love potion in the chocolates which makes you fall for whomever spoke to you after you hiccuped, but thankfully only lasts an hour. Nyarko insists that she didn't know about it, or else she wouldn't have shared the candy with everyone; besides, she wants to win Mahiro's love legitimately. When asked why she wasn't affected, she suggests that her love for him is stronger than anything the potion could have caused.
** It also affects Yoichi at the end, who was left behind and fishing the entire time Mahiro was being chased. Tsuruko also pops out, having caused a lot of the stuff that happened in the haunted house earlier. He sees her passing by, and then hiccups...
** Nyarko didn't have those reservations in the first ''Remember my Love(craft-sensei)'' short, where she attempted to serve Mahiro a breakfast which was apparently laced with aphrodisiacs (judging by the fact that Shanta-kun snuck a sausage off the plate and ended up rolling around in ecstacy).
* LuminescentBlush: This very obvious blush is proof that Mahiro isn't that annoyed by Nyarko's presence. Sometimes.
-->'''Nyarko''': "Oh, you're blushing! How cute, Mahiro!"
* LyricalDissonance: Opening song of Anime.
* MaamShock: In episode 11, as Mahiro and Guthatan are being chased by Nyarko ''et al'', they pass by Luhy's takoyaki stand. Mahiro asks her not to say anything, but since Guthatan called her "obaa-chan" (a Japanese term of address for older women, such as grandmothers), she immediately rats them out when Nyarko comes by.
** In the OVA, Nyarko refers to Luhy as a "30-year-old mage"[[note]]A meme on Japanese message boards that says if you're unmarried by age 30 you can become a magic-user[[/note]]; this pisses Luhy off enough that she [[AnIcePerson starts freezing over the living room]].
* MadnessMantra[=/=]SurvivalMantra: After losing his SAN, Mahiro begins to repeat "It's only ink..." while trying to forget about the pool of Nightgaunt blood shed by Nyarko.
* MagicalGirlfriend[=/=]InterspeciesRomance: Parodied, with the girlfriend in question being a Lovecraftian horror.
* MaleGaze: Used quite a bit in the show.
** Subverted with the pan up Nyarko's legs to her face in the opening, as it's not a ''male'' looking, but the very female [[SingleTargetSexuality Cuuko]].
* ManIFeelLikeAWoman: Inverted and played straight. [[spoiler:When Nyarko and Mahiro switched bodies, Nyarko wasted ''no'' time at all and comes back from a LONG trip to the restroom happily singing "Oh, boys are so great!! It's a feeling that girls just won't understand!!". On the flip side, Mahiro can't even find the courage to look at Nyarko's naked body while taking a bath.]]
* ManicPixieDreamGirl: Nyarko's entire personality basically both purposely plays up and spoofs this character type. She literally drags around Mahiro, and despite all his resistance he does find her cute.
* MediumAwareness: Brought to you by RuleOfFunny. Mahiro, for example, somehow reads an imaginary number bubble floating next to Shantak-kun.
** Spoofed in the first episode of ''Nyarko-San W'', where he interrupts the ''{{Series/Bewitched}}'' opening parody, only for it to be revealed as a video project Cuuko is putting together for Nyarko. Strangely, he doesn't seem to notice that the title card for himself also mentions some woman named Creator/EriKitamura...
* {{Meganekko}}[=/=]{{Megane}}: Luhy and Yoichi wear them normally. [[InvokedTrope Invoked]] in episode 9 of the second TV series when Nyarko tries it on Mahiro (doesn't work), makes ''him'' try on a pair (makes her and Hasta {{Squee}}), and when Cuuko tries it on Nyarko ([[HypocriticalHumor and gets the cold shoulder]]).
* MisterSeahorse: Invoked by Cuuko when she eventually makes the switchover from PsychoLesbian lusting after Nyarko to DepravedBisexual who wants [[HaremSeeker Nyarko and Mahiro as her wife and husband]]; she declares that her new end goal is to become pregnant with Nyarko's child... and to make Mahiro pregnant with her child. Mahiro flips out at the idea, likely because, given who's talking, she probably ''could'' get him pregnant if she wanted.
* MoeAnthropomorphism: The Great Old Ones depicted as teen girls (as well as one hot adult woman and an effeminate boy).
* MoeStare: Ear to ear smile, abnormally huge eyes... no doubt, she is the Crawling Chaos.
* MonsterRoommate: To protect Mahiro "from good morning to good night" Nyarko moves to his house. Not to mention the other cosmic nightmares that board at Mahiro's.
* [[SpaceX Space]] MoralGuardians: The [[spoiler:leader of the rogue Yithians]] turns out to be a HiveMind of such guardians, bent on [[ApocalypseHow destroying the Earth]] because its entertainment industry allegedly causes a high number of sex crimes. [[NonSequitur And because their boss]] [[ItsAllAboutMe wants the social status]].
-->'''Nyarko:''' "[[LampshadeHanging So you've revealed your true intent.]]"
* MundaneUtility: In the first anime series, Cuuko summons [[AnIcePerson Aphoom-Zhah]], the Cold Flame: a bright grey living flame that freezes on contact. Cuuko uses it to cool down a dessert.
* {{Mundangerous}}: Mahiro's fork. In one episode Nyarko even [[LampshadeHanging remarks]] that "For some reason, Mahiro's forks hurt a LOT..."
--> Mahiro[[note]]said while threatening Nyarko, Hasta and Cthuko[[/note]]: Do not underestimate the fork.
--> Mahiro: The fork... is the strongest weapon in the universe.
** Episode 4 of ''Nyarko-San W'' reveals that Mahiro specifically sharpens his forks for the purpose.
* MysteryMeat: Mahiro never got to know what was the "chicken" in the boxed lunch, let alone Luhy's takoyaki.
* NeverSayDie: Inverted? In episode 7 of season 2, Kuuko and Nyarko talk about how the former's cousin, Kuune is dead. Mahiro immediately corrects them, saying she's merely trapped in another dimension, and a short scene from episode 6 showing Nyarko destroying the room changing device to also show she's not dead. They then settle for her being lost somewhere. [[spoiler: The very end of episode 8 shows that she managed to escape, in a style parodying ''Literature/TheRing''.]]
* NeverTrustATrailer: In the tenth episode of the second season the preview makes it look like episode eleven will focus on Tamao confessing to Mahiro. [[spoiler: While she does, it's under the influence of a love potion and is relevant for less than a minute]].
* NiceJobBreakingItHero: When Kuune reappears in episode 9 of season 2, she at first seems uninterested in what's going on right next to her while playing a video game. Namely that Nyarko is acting all lovey-dovey towards Mahiro. Due to the commotion they make, suddenly Kuune does indeed start looking at what those two are doing, and wondering if Mahiro was just pretending to be Kuuko's fiance to throw her off. [[spoiler:Kuuko then does a kiss on his cheek, which shocks everyone around them, and Kuune is shocked that this particular kiss amongst their kind signifies a ritual of love.]]
* NiceJobFixingItVillain: While they're not bad guys per se, Nyarko's superiors rebuild Earth's guardian in episode 12 of season 2, which means Nyarko, Kuuko, and Hasuta are no longer needed to guard the planet. They also upgrade it, and in initial field testing against Nyarko, Kuuko, and Hasuta, their attacks do nothing against it. Unfortunately, for whatever reason, they programmed the guardian with Nyarko's mind, causing the guardian to then obsess over Mahiro, giving the three a real excuse to destroy the machine and thus claim its not ready to protect Earth. Which would then allow them to continue guarding Earth a little longer and watch over Mahiro.
* NoGuyWantsToBeChased:
** Mahiro spends a lot of time keeping Nyarko's advances at bay. In episode 5 of season 2, he quietly mentions that if she wasn't so aggressive in her pursuit of him, he'd probably like her, although Nyarko doesn't hear it. And in episode 6, he tells her to tone it down a little bit during her AnguishedDeclarationOfLove, which she totally ignores the next morning.
** Nyarko does the same towards Cuuko.
* NominalHero: While technically a space cop doing her job, Nyarko is protecting Mahiro out of a crush, takes on the bad guys with too much enthusiasm and does a little personal smuggling of the kind she's supposed to stop.
--> '''Nyarko''': "It's not a crime if no one finds out."
* NotSoInnocentWhistle: Gets used three times in the first season, each with the same subversion: the person in question can't whistle, resulting in Not-So-Innocent ''Blowing Noises''.
* NotWhatItLooksLike:
** When Yoriko arrives home at the beginning of Episode 4, the first thing she sees is her son pinning one girl to the ground (and positioned between her legs) while another clings to his back. Of course, he was really trying to kick Nyarko and Cuuko out ''before'' his mother came home.
** In episode 3 of ''Nyarko-San W'', Tamao calls up Nyarko, who says it's not a good time to talk...[[CoitusUninterruptus between heavy breathing, gasps of pleasure, and "Oh, Mahiro!"s]]. And then Mahiro yells at her to quit fooling around, at which point we see they're surrounded by angry monsters.
** Episode 8 of ''Nyarko-San W'' has Yoichi and Tamao coming out of Agent Smith's MindControl in the middle of a game of Twister. Of course, Tamao lets out a BigNo.
* ObliviousToHisOwnDescription: In episode 12 of ''Nyarko-San W'', Nyarko's reaction to the [[AIIsACrapshoot rampaging]] [[spoiler:Banshin]]'s unusual behavior (namely, [[spoiler:obsessing over Mahiro and doing ''Kamen Rider'' poses]]) is to ask if it's brain is short-circuiting or something. Mahiro quickly points out to her that it's acting that way because it's based on '''her'''. [[HypocriticalHumor At which point she starts praising it.]]
* OddlyNamedSequel2ElectricBoogaloo: The second TV season, ''Haiyore! Nyarko-San W''; since it's pronounced "Double", it's probably a ShoutOut to ''Series/KamenRiderDouble'', though in the preview attached to the OVA episode Nyarko suggests it's a nod to ''[[Anime/MobileSuitGundamWing Gundam Wing]]''.
* OffscreenMomentOfAwesome: In the opening for episode 3 of W (season 2), Nyarko charges a large group of aliens/monsters. Then the opening credits roll, and after its done, the scene cuts back to the characters standing around all of the defeated aliens/monsters Nyarko presumably beat up.
* OtakuSurrogate: Nyarko shares the same obsession her race has with Earth (specifically, Japanese) entertainment.
* OvertOperative: Despite taking human forms, Nyarko, Cuuko, and Hasta use their real names when introducing themselves to Mahiro's class. Nyarko even goes so far as announce that she travels the stars and fights villainous deities.
* ParentalAbandonment: Mahiro lives alone largely because his parents travel a lot. His mom does return home occasionally however, and is seen more in season 2.
** His father's absence is explained in episode 4, where Yoriko says that he's going to be stuck at the office for a while making up the vacation days he took off for their latest honeymoon.
* PhantomZone: The "convenient barrier" Nyarko uses to fight in privacy.
* {{Pixellation}}: Used several times in the first Flash anime. [[YouCannotGraspTheTrueForm For our own good too.]]
* ThePlan: [[spoiler:Roy Fogger the Lloigor, Ghutatan's butler, turns out to be yet another space smuggler and an avid eroge player. Irritated that, by snatching an eroge Nyarko lent to Ghutatan, Mahiro is indirectly denying him access to them, he used the chaos of Nyarko, Cuuko and Hasta's fight against the Shoggoths to deliberately injure her, so when Mahiro chews them out for (apparently) accidentally wounding Ghutatan with their boisterousness and leaves them alone, Roy would use the chance to trap him inside a GroundhogDayLoop. Unfortunately, [[ChekhovsBoomerang he never took into account the Mirror of Nitocris]], let alone [[ViolentlyProtectiveGirlfriend Nyarko's resolve to lay the pain on anyone who hurts Mahiro]].]]
* PlotTailoredToTheParty: Occurs unintentionally in episode 9 of ''Nyarko-San W'', where the villain Agent Smith challenges Mahiro's group to a series of games in order to free the school from his hypnosis. Smith picks the games he thinks he can win easily[[note]]including [[http://en.wikipedia.org/wiki/Daifugō Daifugō]], Mahjong, and Darts[[/note]], but ends up losing because Nyarko and Mahiro are just plain better. Played the straightest with the game of Darts, which Mahiro handily owns thanks to his fork-throwing skills.
** This sequence also turns the [[Series/KamenRiderDouble "Cyclone!" "JOKER!!"]] OverlyLongGag into a ChekhovsSkill, since Nyarko's ability to create infinite Jokers is what lets her beat Smith.
* PocketProtector: [[spoiler:See ChekhovsBoomerang]].
* {{Polyamory}}: Cuuko asks Mahiro to marry her so that she can, by extension, be married to Nyarko.
* POVBoyPosterGirl: Fits this trope to a T.
* PowerLevels: Jokingly referenced in the first novel, where Nyarko claims that she's one of the strongest fighters on Earth with a Fighting Power of 530,000[[note]]For ''DBZ'' fans, that's equal to Frieza's first form[[/note]]; she even mentions that an ordinary farmer with a hunting rifle has a Fighting Power of 5.
* PrehensileHair: Nyarko's IdiotHair. Nodens's beard can grab people.
* PrettyFreeloaders: All of the aliens in Mahiro's house. Of course, even if they ''do'' offer to help out, Mahiro will probably tell them "No", since they tend to make things worse.
* ProductPlacement: The shop in Episode 1 of the anime has covers and posters of publications of GA Bunko, this series' LightNovel label. An instantly recognizable one is the cover for Volume 1 of ''LightNovel/OreNoKanojoToOsananajimiGaShurabaSugiru''.
** Season 2's first episode aired fairly soon after said series' anime had just ended, so when they returned to the shop, there are posters for it all over the place.
** Taking this to MindScrew levels, you can actually [[http://bit.ly/167EZVI spot]] posters for ''Nyarko-san'' itself in that scene.
** In season 2's second episode, Mahiro randomly finds a copy of the [[KamisamaNoMemoChou Heaven's Memo Pad]] light novel from a bookshelf at the Celaeno Library. [[spoiler:It plays a key role in the next episode.]]
** The miscellaneous "Nyarko Goods" Nyarko gives to Mahiro, including the Yes[=/=]No Cushion and body pillow, do exist in the real world; in fact, the body pillow scene happens in the light novel as well, but the illustration uses the more {{NSFW}} side.
* PunctuatedForEmphasis: Nyarko shouting and striking poses that form the letters of '''B! L! T!'''
* {{Pun}}: Being from Japan, and a parody, the series is chock full of these. Here's a few shining examples:
** Cuuko (as in "[[SugarAndIcePersonality Kuudere]]") for a [[PlayingWithFire Chtughan]] girl.
** R'lyehland sells [[TabletopGame/CallOfCthulhu Cola of Cthulhu]].
** Nyarko's "Three Minute" Cooking segment. When she pulls out a censored alien ingredient, Mahiro freaks out, and Nyarko points out that it's "SAN-pun" Cooking.
** The [[Series/KamenRiderDecade DK-do]] [[MilestoneCelebration 10-year-anniversary]] premium cake made by D. Endo[[note]]In Japanese, "decade" is pronounced di-kei-do.[[/note]].
** Cuuko's "[[TheDunwichHorror dun-wich]]". Lampshaded when Mahiro responds "You don't have to force yourself to make bad jokes, you know".
** The title of Episode 7 is ''Blue Coral Reef'', which in Japanese is "Aoi ''SAN''goshō".
** And a subtle one in the title alone: Haiyore! Nyarko-''SAN''.
* RaceAgainstTheClock: Used in ''Remember my Love(craft-sensei)''. After the initial short is over, it cuts to a scene of a massive [[Series/StarTrekTheNextGeneration Borg-ish]] ship heading towards Earth, with the days left "Until The End Of Mankind". Then again, the shorts have nothing to do with the ship, until the last episode or so.
* RapunzelHair: Nyarko and Cuuko
* RealPlaceBackground: Nodens' auction house front just looks like the Sagrada Familia, a famous church and touristic spot of Barcelona, Spain.
* RedHerring: [[spoiler:Ghutatan is shown lounging around an observation deck]] even as Mahiro fruitlessly searches for Nyarko and company amidst the GroundhogDayLoop he has just woken up to. Turns out [[spoiler:that scene is just part of an overall ShoutOut to ''Anime/UruseiYatsura'', and Ghutatan is just as much a victim of the time loop as Mahiro.]]
** In episode 9 of season 2, the school is taken over and the main characters at first blame Cuune since they're attacked by fire guardians. They end up running into another Cthuguhan who challenges them to a contest in order to release the students, or force them to take part if they lose. [[spoiler:It turns out Cuune had nothing to do with any of this, since she was off getting the newest ''Dagomon'' game.]]
*** That same episode ends with both Nyarko and Mahiro [[LampshadeHanging remarking]] that they thought the Cyclone Vacuum would end up being the ChekhovsGun that saved the day, especially after all the build-up it was give.
* RedSkyTakeWarning: Nyarko's "convenient barrier" to keep TheMasquerade turns the scene dark and tinted red, sky and Moon included.
* ReferenceOverdosed: Counting the ''Franchise/KamenRider'', ''Franchise/{{Gundam}}'' and ''Manga/JoJosBizarreAdventure'' {{Shout Out}}s alone is daunting.
* RetGone: [[spoiler:In one of the later novels, Nyarko and Cuuko get written out of existence by Nyogta, a grade-school classmate of theirs who they beat up for bullying Hasta. Mahiro and Yithka end up going back in time in order to SetRightWhatOnceWentWrong.]]
* RubberFace: Nyarko does this to Kuuko in episode 9 of season 2.
* RuleOfThree: Whenever Mahiro asks somebody to make a [[ItsALongStory long story]] short, he asks him/her to summarize it with three lines or less[[note]]The phrase he uses is essentially the Japanese version of "TL;DR"[[/note]]. [[NonSequitur The fourth will always be entirely unrelated.]]
** Eventually he got so sick and tired of everyone giving him four lines that he decides to ask the next enemy to summarize it with four lines. Of course he is met with a three-line response.
* RuleThirtyFour: In the first episode of ''Nyarko-San W'', Mahiro is horrified to discover that this rule applies to ''him'', as an alien {{Doujin}} circle wrote a BoysLove manga with him as the "star". Nyarko, Cuuko, and Hasuta fight over it until Mahiro buys it and destroys it.
* RunningGag: As well as those listed under RuleOfThree and AlienLunch, whenever Mahiro [[DefrostingIceQueen starts to accept his feelings towards Nyarko]], she drives him off by [[SerialEscalation topping all her previous perverted behaviour]].
** Also, Nyarko's yelps of pain will be themed for a particular episode; for example, in the first episode of the TV series, her yelps are all mecha from ''Anime/MobileSuitGundam'' and ''[[Anime/MobileSuitZetaGundam Zeta Gundam]]''. Other themes include [[Anime/SpaceRunawayIdeon Buff Clan mecha]], [[Anime/AuraBattlerDunbine Aura Battlers]], and Series/KamenRiderOOO's Combos.
* SayingTooMuch: In the ''Nyaruani'' episode "Cooking", Nyarko's recipe for Cooked Whole [[SoundEffectBleep *BLEEP*]] revolves around an ingredient that's really hard to get thanks to the Space Washington Treaty; immediately after saying this, she thinks to herself "Crap, I shouldn't have said that."
* SchoolgirlLesbians: Cuuko has a one-sided crush on Nyarko. More of a post-schoolgirl case since both have already graduated from space elementary school but attend Mahiro's alma mater, Boryo Municipal High School to keep an eye on him.
* SeriousBusiness: The entities of the Cthulhu mythos view Earth's entertainment as this to the point where there's laws regarding how much can be taken from Earth, smuggling involving it, [[spoiler: and some psychotic MoralGuardians feeling it being a bad influence is such a big that they should destroy the entire Earth.]]
* SesquipedalianLoquaciousness: Playing with Lovecraft's taste for colorful, archaic adjectives and words, Nyarko sometimes gives ominous, long descriptions of mundane things. For example, after Mahiro alerts her to a Nighgaunt attack with a bump on the head...
--> '''Nyarko''': "I'm suffering from abnormal and blasphemous amounts of ominously chaotic pain."
* ShareTheMalePain: It might have been sent to kidnap him, but even Mahiro feels sympathy for the Nightgaunt who takes a [[Series/KamenRiderKuuga Mighty Kick]] to the groin.
* ShoutOut: Has its ''[[ShoutOut/HaiyoreNyarkoSan own subpage]]'' to preserve this page's sanity.
* SickEpisode: Nyarko catches a fever in episode 10 of season 2.
* SingleTargetSexuality: Nyarko and Hasuta towards Mahiro, and Kuuko towards Nyarko. Subverted with Kuuko who falls for Mahiro.
* SlapstickKnowsNoGender: The comical abuse actually comes from Mahiro using a fork to stop Nyarko's crazed binges and unsolicited advances.
* SmallReferencePools: Those not familiar with the expanded Mythos won't know Cthugha or Atlach-Nacha. As a result, some have mistaken Cuuko as Cthulhu because of the similarities of their names. Also, Elder Gods, Great Old Ones and Outer Gods are not synonymous.
* SpacePolice: The Planetary Defense Organization has sent Nyarko to stop a smuggling and human-trafficking ring.
* SpaceX: Nyarko and Cuuko refer to the alien equivalents of CQC, Kindergarten, etc. by simply adding the word "Space" before them.
-->'''Mahiro:''' "[[LampshadeHanging You can't just add 'space' to everything.]]"
* SpeakOfTheDevil[=/=]CallOnMe: Nyarko tells Mahiro to say her name if he needs her.
* SpellMyNameWithAnS: It's bad enough that the Great Old Ones have unpronounceable names. Now transliterate those names in katakana, and discover why Nyarko, Cuuko, and Hastua are spelled inconsistently.
** For Nyarko, her name is supposed to be "Nyarlathotep" combined with the Japanese suffix "-ko", which makes a name feminine. That means Nyaruko, Nyarko, and Nyarlko are all perfectly valid English spellings (until [[WordOfGod Aisora-sensei]] steps in and clarifies which one is correct).
*** Even ''ThatOtherWiki'' is confused on the spelling: they use "[[http://en.wikipedia.org/wiki/Haiyore!_Nyaruko-san Nyaruko]]."
* {{Squee}}: In the first episode of the 2012 series, all the girls in Mahiro's P.E. class do a simultaneous Squee when Tamao (falsely) says that Mahiro admitted to being attracted to Nyarko.
* [[TheDevTeamThinksOfEverything The Staff Thinks of Everything]]: Episode 11 of the second anime ends with Mahiro finds himself in a world where there are no other people; after this episode aired, the image on the ''Nyarko-san'' homepage (the one at the top of this page) was replaced with one that showed Mahiro in the same pose, but none of the other characters; it reverted to normal after episode 12.
** During the run of ''Nyarko-San W'', episode 7 was delayed a week due to the 2013 World Table Tennis Championship; the staff responded by editing the website's front page so that Nyarko and Cuuko were holding table tennis paddles.
* StarfishAliens: Nyarlathotepians, Chtughans, etc. are actually abominations the human mind cannot grasp without going insane. The human forms they take are quite pleasant, though.
* [[StatusQuoIsGod Status Quo Is Cthulhu]]:
** In episode 12, after Mahiro gets his wish to get some peace and quiet, he begins to miss the other characters despite his complaints about them.
** In episode 6 of season 2, Nyarko returns to her former GenkiGirl mood after being reassured by Mahiro that he doesn't hate her. She also traps Kuuko's cousin Kuune in another dimension when she gets rid of the room changer device she bought so the alien characters could have their own rooms inside Mahiro's house while the latter was sleeping after having an overnight gaming session with Kuuko.
** Near the end of episode 12, season 2, Mahiro sighs and says that Nyarko, Kuuko, and Hasuta would always figure some excuse to stay on Earth and in his house.
* StopOrIShootMyself: Isurugi, while inside Yoichi's body, does this to stop the main characters from trying to interfere in his plans in episode 10.
* StripPoker: In episode 7, Nyarko suggests playing this after Mahiro (in a desperate attempt to ignore her) suggests that he and Yoichi go play cards. This is what leads to the infamous BrutalHonesty and HeroicBSOD moments.
* SufficientlyAdvancedAlien: True to the original source, the "deities" of the Mythos are really advanced and freaky aliens.
* SuperDeformed: Happens on occasion in the anime.
* SuspiciouslySimilarSubstitute: Zig-zagged. In episode 12 of season 2, while touring a factory where the new Earth guardian is being built, Mahiro and the others run into the chief engineer, Nodens, who was the first villain they encountered in the first season. However, despite looking and sounding exactly like the first guy, this Nodens claims he's not the same guy. But then he goes up to Mahiro and claims the boy would be good in some alien pornos, which was also what the first Nodens wanted to do to him. Nyarko's bosses then threaten to report him, causing him to back off and continue with the guardian demonstration.
* TakeAThirdOption: In the last episode of ''Nyarko-san W'', Nyarko asks Mahiro for a kiss (or a baby) as reward for fighting off the out-of-control Banshin. Yoriko comes up with another idea, suggesting that Mahiro pat her (as well as Cuuko and Hasta) on the head if they succeed. The trio deems this acceptable and heads off to kick robot butt.
* TakeThat: In the light novel, Nyarko explains that the Cthulhu Corporation always pressures the Space Government for copyright term extension, so they keep their mascot Mr. Innsmouth from entering the public domain. Eventually the space governors get tired of the nagging and simply pass the '''[[http://en.wikipedia.org/wiki/Sonny_Bono_Copyright_Term_Extension_Act Innsmouth Protection Act]]'''.
** The various jammers and other gizmos used in Episode 10 are a clear dig at ''[[Anime/MobileSuitGundamSEED Gundam SEED]]'s'' Neutron Jammer, Neutron Jammer Canceller, etc.
** The main villain of episode 10 is a clear shot at Shintaro Ishihara, the governor of Tokyo and the man behind numerous obscenity laws aimed at cleaning up anime and manga.
* TakingTheBullet: [[spoiler: Nyarko (in Mahiro's body)]] does it for [[spoiler: Mahiro (in her own body)]]. Luckily she survives.
* ThatLiarLies: In episde 7, Mahiro desperately tries to convince everyone that Nyarko is lying when she claims to already be pregnant with their child. He fails, and even his own mother falls for it (though in her case, it might have been IWantGrandkids). When Hasta runs out of the room sobbing, Mahiro quietly remarks "Well, I guess it's okay for ''him'' to think it's true..."
* ThemeTuneCameo: The first episode of ''Nyarko-san W'' has Nyarko drag Mahiro to a CosplayCafe with a karaoke machine, where we get to see her, Cuuko, and Tamao sing "Taiyo Iwaku Moeyo Chaos", the theme song for the first season. Mahiro [[LampshadeHanging lampshades]] the fact that Tamao apparently showed up just to sing and then immediately vanished.
* TheReasonYouSuckSpeech: Mahiro gives a couple to Nyarko, largely because of her antics and tendency to go overboard in various situations. His BrutalHonesty in episode 7 of the 2012 series probably qualifies.
** In episode 6 of the second anime, Yoriko gives a less-insulting version to Luhy when she explains why the Xoth-731 console is doomed to failure. It's even funnier once you notice she's making very cogent points about the real-world game industry.
* TheThemeParkVersion: In the TrappedInTVLand episode, Mahiro finds himself experiencing only the events one would encounter in a DatingSim (like Christmas and Valentine's), causing him to "leap" randomly. It's never addressed if this holds true for the other people trapped in the game, but the fact that Nyarko apparently had the time to knit Mahiro a scarf for Christmas implies [[NoEndorHolocaust they didn't]].
* TomeOfEldritchLore: Spoofed in the light novel, where Mahiro will research new characters by looking up their CthulhuMythos counterparts -- but instead of something like the ''Necronomicon'', he uses Chaosium's ''[[TabletopGame/CallOfCthulhu Field Guide to Cthulhu Monsters]]''.
* TrappedInTVLand: The premise of Episode 8 of the anime -- the gang gets trapped inside a WonderSwan-lookalike (with a DatingSim currently playing), and they couldn't get out unless Mahiro chooses either [[FirstGirlWins Nyarko]], [[{{Yandere}} Cuuko]], [[GayOption Hasta]] or [[ThirdOptionLoveInterest Tamao]].
* TheTriple
** Nyarko has come to Earth with three duties: protecting Mahiro, destroying a smuggling ring, and shopping.
--->'''Mahiro:''' "[[LampshadeHanging Obviously the last one is of your own making.]]"
** "Hasta is an alien? Hasta is Hastur, the Outer God of Wind? Hasta is... a boy???"
* TokenMiniMoe: Hasta and Guthatan in the TV series. 4koma manga adds Nakko and also extends the role of the humanized Shantak-kun.
* TomboyAndGirlyGirl: In the second Flash series, with Nyarko and Nyarue.
* TrailersAlwaysLie: [[http://www.youtube.com/watch?v=cU0K4fQYX7A The OP]] of the first TV series makes it look like it's a normal anime with RomanticComedy themes. It's still a short gag Flash animation.
* ATwinkleInTheSky: As is proper for a bumbling ineffective villain, Nyarko's brother is thrown over the horizon screaming.
* UndeadTaxExemption: While they don't explicitly state they are aliens, none of the students at school seem fazed that they just happen to have three transfer students all join their class in a very short period of time.
* UnwantedHarem: Very much so. [[GenkiGirl Nyarko]], [[GayOption Hasta]], [[spoiler:Guthatan]], and even [[PsychoLesbian Cuuko]]. And that's not getting into the "sanity-depleting abomination" issues. Ironically enough, the only human with a crush on Mahiro isn't on that list because [[IWantMyBelovedTOBeHappy she doesn't want to get in the way]].
* [[UsefulNotes/JapaneseLanguage Useful Notes: Japanese Language]]: Most of the time, when Nyarko says "I love you" to Mahiro, she says "''daisuki''" (大好き), which literally means "like a lot" and is generally regarded as the acceptable way of saying you love someone or somethings; in some contexts it can even come off as joking, since it's just "big" plus "like". During her emotional breakdown in ''Nyarko-San W'' episode 6, however, she uses "''aishiteru''" (愛してる), which has much stronger connotations, and tends to only be used in romantic fiction; it's about as serious a declaration of love as a person can make, and shows that she's taking all her silly behavior off the table and trying to show Mahiro that she really means what she's saying.
* TheVerse: ''Haiyore! Nyarko-san'' [[WorldBuilding set up the world]] that's also used in Aisora's later works, [[http://ga.sbcr.jp/novel/miyama/01.html Miyamasanchi no Berutein]] and [[http://ga.sbcr.jp/bunko_blog/cat378/020796/ Valkyrie Works]].
* VictoriasSecretCompartment: Nyaruko has one, as shown in episode 3 of the second season. Even though she's nearly flat-chested.
** Kuune, Cuuko's cousin, pulls a tape recorder and a huge binder out of her cleavage in the same scene.
* VoicesAreMental: Handwritings aren't, apparently.
* WakeUpGoToSchoolSaveTheWorld: Nyarko, Cuuko, and Hasta don't have to do the "go to school" part, since they're adults and have already graduated from [[SpaceX space]] college; they just like being around Mahiro. He, on the other hand, plays the school part straight but tends to get dragged into the "save the world" part by the trio.
* WelcomeToCorneria: Poor Yoichi has to do this in episode 8 when everyone is [[TrappedInTVLand Trapped in a Dating Sim]]. He even repeats the same dialog as Mahiro [[GetAHoldOfYourselfMan shakes him and says "Not you too!"]]
* WhamLine: Mahiro delivers one to Nyarko in episode 7.
-->'''Mahiro:''' [[BrutalHonesty I don't like you.]]
** Nyarko (while in Mahiro's body) delivers one to Mahiro (who is in Nyarko's body) in episode 9.
-->'''Mahiro:''' Nyarko, I love you!
** Kuuko asks Mahiro one in episode 5 of season 2. It causes him to cut his finger as he was preparing some dinner.
--> '''Kuuko:''' Boy, do you like Nyarko after all?
** In episode 12 of season 2, the first thing Nyarko says after entering her HeroicBSOD, and the point where the gravity of the situation finally hits Mahiro.
-->'''Nyarko:''' So does this really mean I have to leave Mahiro-san forever?
* WeaksauceWeakness: The aliens in episode 10 of season 2 are defeated [[spoiler:by the music coming from Nyarko's ringtone.]]
* WeWantOurJerkBack: "How to Defeat a Kind Enemy" (a short story adapted into an OVA episode) has Mahiro try to get Nyarko to act like a MagicalGirl instead of a HenshinHero in the hopes that it'll make her act less crazy and violent. Unfortunately, she gets ''even worse'', spouting cliché Magical Girl talk about "purifying souls" while lighting Nightgaunts on fire and making them vomit blood, so Cuuko and Mahiro [[Film/MenInBlack neuralize]] her back to normal.
* WhatTheHellHero: After Mahiro's WhamLine in episode 7, Nyarko suffers from a long lasting ColorFailure. Which prompts his mom to ask him if she really is that awful, since she has been saving his life and saved hers as well. She essentially forces him to take her on a date to make up for hurting her feelings.
** Nyarko's AnguishedDeclarationOfLove in ''Nyarko-San W'' could be seen as this, since she outright tells Mahiro that his refusal to [[CanNotSpitItOut just spit it out]] is tearing her apart.
* WhenAllYouHaveIsAHammer:
** When Mahiro's mother is being kidnapped in episode 5, Cuuko forms a fire barrier around the house so Nyarko can't get in. Nyarko says that everything can be solved with a karate kick, and proceeds to kick it, only to hilariously burn her foot in the process.
** Mahiro and his forks. Nyarko, Kuuko, and Hasuta seem deathly afraid of it, and he even buys some for his mom who uses them during her adventuring.
* WontTakeYesForAnAnswer: In episode 4 of ''Nyarko-San W'':
-->'''Tamao:''' Why don't you try just kissing him?\\
'''Nyarko:''' I already did.\\
'''Tamao:''' ...Okay, never mind, I'll think of something el--'''''WHAAAAAT?!'''''
* WidgetSeries: Naturally, considering the premise.
* YearInsideHourOutside: In "How to Defeat a Kind Enemy", Nyarko's MagicalGirl training with Luhy takes place in the [[Anime/DragonBallZ Hyperbolic Time Chamber]], though unlike the ''DBZ'' cast, they only spend a month inside (two hours outside)[[note]]This completely averts WritersCannotDoMath, since 2 hours × 365 = 730 hours, which is just shy of 30 days[[/note]].
* YouHaveOutlivedYourUsefulness: The Yith creature in episode 10 tells this to Isurugi (who is inside Yoichi's body) in episode 10 after the latter creates a device which he thought was going to transplant Yith beings into humans so they could experience human and Earth culture first-hand. Instead it turns out to be a portal where the MoralGuardian can destroy Earth because its corrupting space morals.
* YouWannaGetSued: In ''Nyaruani'' episode 4, "Gal Games":
-->'''Nyarko:''' ''Lovecraft Plus'', or for short, ''[[VideoGame/LovePlus Love Pl-]]''\\
'''Mahiro:''' Hang on, didn't I just recently tell you not to piss people off?!
** In the OVA "How to Defeat a Kind Enemy", Mahiro stops Cuuko from saying "LightNovel/AccelWorld"; earlier, Luhy refering to her training room as "[[Anime/DragonBallZ the Room of Spirit and Time/Hyperbolic Time Chamber]]" gets cut off by Shanta-kun sneezing.
* YouWatchTooMuchX: Mahiro says this to Nyarko a lot; particularly at the end of episode 2, when she declares "[[AndTheAdventureContinues There are still enemies to fight!]]" and he responds with "You sound like a character from a cancelled TV show."
* ZettaiRyouiki: Both Nyarko and Cuuko wear this as part of their school uniform, as seen in the page picture above.

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