!!The book series provides examples of:

* AngstWhatAngst
* AnticlimaxBoss: Every big threat in The last Olympian. [[spoiler:The Drakon dies in six pages, and Kronos barely fights enough to look strong. Even in the last fight it didn't take too long to bring him down. Even Typhon.]]
** Especially [[spoiler:Typhon.]] At least the others had actual battle scenes where the hero had to struggle. [[spoiler:Typhon is played up as the big monster crushing the majority of the Gods for the entire book]] and then he actually shows up and is taken down by Poseidon's army in a few paragraphs.
* BigLippedAlligatorMoment: The incident with the Sphinx in the Labyrinth was either this, or an AuthorFilibuster. [[EpilepticTrees Of course, it's entirely possible that it was included because Riordan got frustrated and needed to vent some steam with his opinion on standardized testing.]]
* [[HoYay Bro Yay]]: Travis and Connor Stoll (from the Hermes cabin). Percy and Tyson, too, but the Stolls are [[HeterosexualLifePartners almost never without each other]].
* CrackPairing: Tons. Rachel/Nico, Thalia/Nico, Percy/Clarisse, Rachel/Luke, Apollo/Hermes[[note]]Which is actually technically possible in the [[ClassicalMythology source material]], especially given the fact that both are involved in same-sex relationships with mortals and other gods[[/note]], etc.
* CrazyAwesome: The [[OurCentaursAreDifferent Party Ponies]].
** Apollo.
* CriticalResearchFailure: In the films, everything involving Persephone, Hades' wife. In the original myth, Hades and Persephone have a close, loving relationship, or at least better than several other marriages between the gods. More noticeably, the fact that she is present along side Hades during the story, which takes place during the summer. Persephone, however, only spends winter in the underworld, and her mother Demeter misses her, which is why the world freezes over every winter. In the book, Persephone is mentioned in passing and her throne is seen beside Hades' own, but she herself is never seen as goes the story.
* DieForOurShip: Rachel is frequently treated to this by Percy/Annabeth fans.
* DracoInLeatherPants: [[spoiler: Luke.]]
* EvenBetterSequel: ''The Battle of The Labyrinth'' had even more of awesome moments and CharacterDevelopment in comparison to the already strong ''Titan's Curse''.
** ''The Last Olympian'', big time.
* GeniusBonus:
** There are a number of people who can immediately guess that Bianca and Nico di Angelo are OlderThanTheyLook in ''The Titan's Curse'', when, to evade their pursuers in Washington, D.C., they duck into the Metro. To Bianca, the Metro is new to her, and she even mentions that the last time she and Nico came through D.C. (which was no less than a year prior to the events of the story), the Washington Metro did not exist. Just for the record: the story is set in 2007. The di Angelos are in their early teens. The first segment of the Washington Metro system opened in 1976, well before either Nico or Bianca would have been born. ItMakesSenseInContext though, once Percy deduces that they spent time in the Lotus Hotel & Casino. ''The Last Olympian'' reveals that they were actually born sometime in the mid-1930s, and put in the Lotus Hotel sometime around 1941.
** It might or might not be intentional, but the mention of a statue of Susan B. Anthony strangling Frederick Douglass in "The Last Olympian" might be a roundabout reference to how the two civil rights leaders, formerly steadfast allies, became divided over the issue of the Fourteenth Amendment allowing Black males to vote, but not women of any race (and to add insult to injury, it was the first Amendment that explicitly mentioned male and only male citizens).
* GrowingTheBeard: Most agree that ''The Titan's Curse'' was where the series really began to show its quality.
* FanDumb: Some fans ship Zoe and Artemis, despite the fact that it is specifically stated that the Hunters give up ALL romantic love. Although it is understandable that they want homosexual representation in the series, they are ironically hurting their own cause because if this were true it'd be implying that homosexual love "doesn't count" and "isn't real." Think it through, guys.
** The oath states "I pledge myself to the Goddess Artemis. I turn my back on the company of men, accept eternal maidenhood, and join the Hunt". They have room to play around with its exact meaning.
* FanPreferredCouple: While Percebeth is still dominate, there are still rather decently sized fandoms for Percy/Luke, Percy/Nico, Percy/Artemis, Apollo/Hermess, Poseidon/Athena and Percy/Thalia
* FoeYay: Luke and pretty much everyone. Particularly Percy, Thalia, Annabeth, and (if you squint) Grover.
* HarsherInHindsight: Percy catching Annabeth [[spoiler: when she nearly falls off Olympus is now cringe worthy after the events of the third TheHeroesOfOlympus book.]]
** ''"You will fail to save what matters most in the end."'' [[spoiler: Congrats Percy, you and Annabeth may be ''relatively'' safe together in [[YouAreWorthHell Tartarus]], but Gaea now has the materials to set her plot into motion. You have doomed the world by choosing true love over it.]]
*** Promise (which seems to be the ArcWords in Luke's life), after reading The Diary of Luke Castellan
** The tense relationship between Nico and Percy becomes downright [[TearJerker depressing]] after ''House of Hades'', [[spoiler: where it's revealed he was hiding his true feelings from him.]]
* HilariousInHindsight: "She made ''blue waffles'' and blue eggs for breakfast."
* HoYay: Percy and Nico share a bit of this in ''The Last Olympian''. Luke and Percy do, too, particularly in [[BigBrotherMentor the first book]].
** [[spoiler: And then in later books, it turns out that Nico actually has/had feelings for Percy.]]
* InferredHolocaust: In the first book when Percy, Annabeth, and Grover face Hades, the god of the dead becomes so enraged that he causes not one but two earthquakes, and Percy remarks that it will not have been a peaceful night in L.A. When the kids resurface, Los Angeles is ''burning''. No casualty numbers are given, but it could qualify as a [[FunnyAneurysmMoment Funny Aneurysm Moment]], as Hades had just finished complaining about how the Underworld was overcrowded and didn't need more subjects. Kinda ironic.
** Manhattan sounds pretty bad by the end of the last book. [[spoiler: Everyone had fallen asleep, which probably includes people who were cooking things, people who were in the hospital getting surgery, etc. And Fifth Avenue is a disaster.]]
* LesYay: Silena and Clarisse, Annabeth and Thalia, ZoŽ and Bianca.
** ZoŽ and Artemis, one-sided on ZoŽ's part, arguably.
** Clarisse and Silena in particularly considering they play out the relationship between [[spoiler:Achilles and Patroclus]] to its tragic conclusion. And we all know about ''them''.
* MagnificentBastard: Kronos
* PeripheryDemographic: Because of Riordan's [[ShownTheirWork attention to detail]], some people who're outside the target demographic of young adults find enjoyment in these works.
** So much, that a college professor a troper knows that teaches Greco-Roman mythology actually listed this series as supplementary reading.
* TheyWastedAPerfectlyGoodCharacter: Bianca.
* TheUntwist: Percy's origins. Anyone who knows anything about Greek myth could see the title of the series, the cover of the first book, and then put two and two together. It's really not that hard.
** The fulfilling of the prophecy in ''The Titan's Curse'' It says "One will be ''lost''" and everybody assumes it means someone will die. But it never outright states dying, so with the usual ProphecyTwist you could expect Bianca to be lost and later found. It turns out she gets KilledOffForReal.
* TheWoobie: Everyone not named Gabe, Ares, or Kronos.
** Luke's [[spoiler:mother, May Castellan]], also deserves a special mention here.
** In ''The Last Olympian,'' the narration actually says that Hermes "looked like he needed a hug." If that's not baiting woobiedom, nothing is.
** MRS. JACKSON. Ridiculously nice, sweet, and caring, and yet gets get stuck with an abusive slob of a husband and serious financial problems. [[spoiler: Luckily, things get much better.]]
** Even '''Dionysus''' has a little of this after he revealed his relationship with Ariadne to Percy in the third book, and after [[spoiler: one of his sons die]] in the fourth book.
!!Tropes which only apply to the film:
* AngstWhatAngst: Percy seems to handle [[spoiler: the sudden death / disappearance of his mother]] very well...
* AntiClimaxBoss: [[spoiler: Kronos in ''Sea of Monsters''. Makes you wonder why they even bothered to bring him in this early.]]
* CrowningMusicOfAwesome: "To Feel Alive" performed by IAMEVE, which serves as Thalia's ImageSong.
** The use of FallOutBoy's "My Songs Know What You Did In The Dark (Light 'Em Up)" in the opening scene of Sea Of Monsters made the already awesome scene of Clarisse kicking Percy's butt even better.
*** Christophe Beck's score, especially the music when Percy's group arrives in Hollywood ([[http://www.youtube.com/watch?v=RcBZY1JhZ8U reprised in the finale]]).
* EvilIsSexy: Medusa. Of course, she ''is'' played by Uma Thurman.
* HamAndCheese: While Uma Thurman and Steve Coogan are only briefly in the film, they do manage to make their respective scenes ''awesome''. (See OneSceneWonder below)
* HilariousInHindsight: In the Japanese dub of the films, Percy is voiced by MamoruMiyano, who also later voiced [[Anime/{{Free}} Rin Matsuoka]]. Extra hilarity that, in RealLife, Miyano ''[[IDontKnowMortalKombat doesn't know how to swim]]''. Even more ''extra hilarity'' he voiced [[Manga/DeathNote Light Yagami]], a guy who wants to become a god.
** Goes UpToEleven with TesshoGenda as Zeus: he is the Japanese dub voice of ''[[VideoGame/GodOfWar Kratos]]'', who wants to ''kill'' his father '''Zeus'''.
* LoveItOrHateIt: ''The Sea of Monsters'' film. Some thought this movie was just as bad as the first,others thought it was better and more entertaining.But mostly everyone agrees that it did follow the book better than the first one did.
* NightmareFuel: The scene in Medusa's shop. While it isn't that creepy in the book (there the scene is a lot less ominous up until the Uncle Ferdinand bit), the movie added a panicking woman whose husband had already been turned to stone and she's hysterical with fright. She eventually gets turned into stone too, and the only mention that's made of it is when Annabeth explains how she scraped her wrist (the woman had been holding her wrist when she had been turned to stone and Annabeth had to pull her hand free).
** [[spoiler: Kronos' resurrected body in the second film is rather terrifying. [[FromBadToWorse And then he starts swallowing Half-Bloods whole]].]]
* OneSceneWonder: Uma Thurman and Steve Coogan in the first film. Nathan Fillion in the second.
* TheyChangedItNowItSucks: Admittedly a lot of fans like the book better than the film.
* TheyJustDidntCare: Similar deal (unfortunately for fans of the book) to ''Film/TheSeeker'', considering how the director admitted to not even reading the first book. So much expectations were put into the movie....only for the fandom to be gravely disappointed. The only similarity between the film and the book is the main plot line (just barely).
* UnfortunateImplications: Grover's characterization in the film was such a nonstop barrage of black stereotypes that it lead [[http://msmagazine.com/blog/blog/2010/03/08/percy-jackson-minstrel-show/ one person to liken it to a minstrel show.]]
** Not to mention the fact that of all the major characters to make black, they chose the one who's ''part domesticated animal''.
** Fortunately, his personality is ''slightly'' more like the books in the sequel.
----