* CompleteMonster: [[JerkassGods Nyarlathotep]] differs from most of Creator/HPLovecraft's gods. While Lovecraft describes other Outer Gods and Great Old Ones as [[BlueAndOrangeMorality mindless or unfathomable]], Nyarlathotep is a sadist who is fully aware of humanity's existence, and enjoys exercising his power over them. He kills or drives people to madness while disguised as the Haunter in the Dark, drives entire societies to ruin in the form of the Black Man or the Black Pharoah, and generally treats all life as part of some giant cat-and-mouse game.
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* CreepyAwesome: Any and all of the gods.
* EnsembleDarkHorse: Cthulhu has so little role in Lovecraft's work, yet is the most famous now.
** Despite showing up in about two Mythos stories, Cthylla is pretty well known.
** Nyarly is this for being one of the only truly evil beings in the Mythos.
* EveryoneIsJesusInPurgatory: Interpreting the end of ''Literature/TheDunwichHorror'' to be a parody of the Crucifixion.
** Until you [[http://en.wikisource.org/wiki/The_Dunwich_Horror reread it]], and realize that it ''undoubtedly IS'' a parody of the Crucifixion...
* FanonDisContinuity: While there are plenty of canon disputes within the fandom, Bloch's "Shadow From the Steeple" is commonly held in low regard.
* FandomBerserkButton: In an odd inversion of this, "misspelling" a Great Old One's name in a fan work is actually a handy way of [[ShownTheirWork showing off your knowledge of the Mythos]], since it complies with Lovecraft's reminder that there is no definitive way of spelling the Old Ones' unpronounceable names in any human language. Creator/AlanMoore[='=]s ''TheLeagueOfExtraordinaryGentlemen'', for example, frequently references the Mythos, but it always spells the eponymous character's name as "Ktulu".
* GoKartingWithBowser: Parodies tend to have Cthugha and Nyarlathotep (mortal enemies in the main mythos) as friends or [[CrackPairing trying to pair them up]].
* HilariousInHindsight: Lovecraft described Azathoth as a monstrous indescribable thing which resides in the center of the universe, often described as "gnawing" and "chaotic". Scientists now believe that the center of our galaxy (and, by extension, other galaxies), is a supermassive black hole. Perhaps Lovecraft was on to something....
* InferredHolocaust: The bodies most commonly associated with the Yithians? Those belonged to beings ''native to Earth'' before the Yithians used their mind-swapping powers to leave their own dying world for ours....
* MainstreamObscurity: Plenty of people probably have heard of Cthulhu, but have not read Lovecraft.
* MagnificentBastard:
** A lot of portrayals of Nyarlathotep.
** Thsathoggua.
* MemeticMolester: Y'golonac, who is essentially the god of the bad touch.
* MemeticMutation:
** [=CTHULHU FHTAGN!=]
** [=IA! IA!=]
* OlderThanTheyThink:
** Hastur originally came from Ambrose Bierce's ''Haita the Shepherd''. Chambers used the name in ''TheKingInYellow'', which is where Creator/HPLovecraft got it.
** The term ''Fire Vampires'' were first used for Fthaggua's servitors. Latter, ''TabletopGame/CallOfCthulhu'' used the term to describe Cthugha's Flame creatures, and became the depiction that most associate with.
* PraisingShowsYouDontWatch: Receives a lot of praise from people who know little about it besides that it's where Cthulhu comes from.
* RunningTheAsylum: An appropriate and positive example - Lovecraft encouraged his fans to use his mythology, and expanded off the concepts within those fics. Indeed, without Lovecraft's fan friends, his work would have drifted into obscurity.
* SeinfeldIsUnfunny: Similar to Slender Man in present day, some are considering the character of Cthulhu to be so overused and [[ItsPopularNowItSucks well-known]] that he's become a cliché of the CosmicHorrorStory genre. Fortunately, there's plenty of other monsters and villains in the Mythos for writers to use to avert this.
* {{Squick}}: In Japan, Atlach-Nacha has been associated with this thanks to [[VisualNovel/AtlachNacha a certain video game]].
** One could consider the interbreeding between humans and the Deep Ones to be this since it's basically people having sex with giant fish.
* TooDumbToLive: The protagonist of "Fane of the Black Pharaoh" by Robert Bloch. Being led down by a cultist, the archeologist sees centuries of prophetic events, notably of visitors being lead down the Fane and soon killed. Guess what happens next?
* UnfortunateImplications: Knowing Lovecraft's views on race and religion can cast some of his works into a rather negative light. Other authors tend to avert this.
** The Deep Ones are likely a demonization of miscegenation.
** Also overlaps with MisaimedFandom when [[ChiakiKonaka Non-American, Non-Western authors]], or [[{{Demonbane}} even]] [[NyarkoSan foreign titles, parodies or not]], plays with the Mythos just because [[RuleOfCool it looks cool]] [[ValuesDissonance without knowing the cultural backdrop of those stories.]] With so many Cthulhu-clone in western media - mostly being there for RuleOfCool as well, you can't blame them.
* WordOfDante: Several common aspects of the Cthulhu Mythos (such as the good/evil dichotomy and the Necronomicon as a powerful BrownNote) come from Lovecraft's friend, August Derleth, rather than Lovecraft himself.
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