Warning: This page contains spoilers for the first series and the first three books of the second.Yes! Mark of Athena spoilers are, in fact, everywhere!A Sequel Series to Percy Jackson and the Olympians by Rick Riordan. It takes the same setting as its predecessor and is set a short time after.The first book, The Lost Hero, was released on October 12, 2010. The story follows a half-blood, Jason (like that Jason) finding himself in a school bus with absolutely no memory of who or what he is, along with a girl, Piper, and a boy, Leo. The three turn out to be half-bloods and run into Annabeth (from the first series) and someone named Butch, who are looking for a disappeared character.The second book, The Son of Neptune, was released on October 4th, 2011, and reunites the reader with an amnesiac Percy Jackson, who finds his way to a haven for Roman demigods and leads two newbie heroes on a quest.The third book in the series, The Mark of Athena, was released on October 2, 2012. Percy, Jason, the four new demigods, and Annabeth join forces to fly a Cool Airship to Rome, with Annabeth following a secret and dangerous mission from her vengeful mother.General tropes about the setting carried over from Percy Jackson should be left neatly at the bottom of the page.Please place tropes which only apply to one character on the character sheet. The main article is getting cluttered, and we're only on book three!
And now Reyna is confirmed to be Puerto Rican, meaning the Romans are led by a woman of color.
Alaska: The land beyond the gods. Where Percy, Frank, and Hazel go on their quest in Son of Neptune.
"As they trudged on, Percy thought about all the crazy places he'd seen. None of them left him speechless like Alaska. He could see why it was a land beyond the gods. Everything here was rough and untamed. There were no rules, no prophecies, no destinies—just the harsh wilderness and a bunch of animals and monsters. Mortals and demigods came here at their own risk."
Amnesiac Lover: Averted. Jason quickly reciprocates Piper's feelings, but he doesn't want to lead her on when he isn't entirely sure how he feels about her (first because of his amnesia, then because it turns out they were never dating in the first place, and then because of Reyna).
Subverted with Percy. Annabeth is the one thing he's absolutely sure about from his old life.
Well, he WAS born before they really had invented it yet...
Art Shift: The covers of the first two books. Probably deliberate, to accentuate the more culturally refined nature of the Greeks (featured in ''The Lost Hero''◊) verses the rougher, grittier Romans (featured in ''The Son of Neptune''◊).
Ascended Extra: "D-list goddess" Khione plays a major role. Gleeson Hedge (referenced once in TLO) is another example. Will Solace and Jake Mason may also apply.
Hylla, Circe's assisstant, last seen in Sea of Monsters turns up again as Reyna's sister and queen of the Amazons.
Euryale and Stheno, Medusa's sisters, in Son Of Neptune Also, Hazel and after the war games, Gwen (aka: Centurion Shish-ka-bob).
Monsters coming back from the dead in nothing new. Unfortunately, due to Death himself being chained, monsters come back mere seconds after being slain.
Let's just knock out all the tropes associated with "The Doors of Death are open, and Greek villains and monsters are coming back to life willy nilly":
Back from the Dead: Hazel sacrificed herself in 1941 to prevent Gaea from waking fully during World War II. Nearly seventy years later, Nico went to the underworld to sneak Bianca out, only to discover she'd already tried for rebirth. Instead, he rescued Hazel, who was also a child of Hades/Pluto.
Death Is a Slap on the Wrist: Pretty much the entire theme of The Son of Neptune - Death has been chained and the literal doors to the afterlife are now open.
Badass Boast: Jason and Porphyrion both during their boasting match.
Jason:I'm the son of Jupiter! I'm a child of Rome, consul to demigods, praetor of the First Legion. I slew the Trojan sea monster. I toppled the black throne of Kronos, and destroyed the Titan Krios with my own hands. And now I'm going to destroy you, Porphyrion, and feed you to your own wolves.
Leo: Wow, dude. You been eating red meat?
Percy to Polybotes, “You. Me. To the finish.”
Percy: Twelve legion. FULMINATA. Which then shot out a thousand blasts of lightning that basically annihilated the Giants entire center line due to Percy's willpower. BAD ASS.
Badass in Distress/Distressed Dude: Percy in The Lost Hero. Nico takes up the position from him by the end of Son of Neptune. Flips back to Percy and adds Annabeth by the end of The Mark of Athena.
Bad Bad Acting: Acting isn't one of Frank's many abilities.
Bag of Holding: Leo's magic toolbelt, which can produce any sort of tool (so long as it's not too huge) and apparently breath mints.
Piper gets a Cornucopia which allows her to produce an unlimited supply of food and water.
Bag of Spilling: In The Son of Neptune, Percy loses most of his memories. He is still effectively invulnerable due to his Curse of Achilles and repeatedly defeats the gorgons. Soon after June tells him that for him to enter Camp Roman he must lose his Curse of Achilles, leaving him vulnerable to harm, and he chooses to enter.
Batman Gambit: Double subverted. Percy tricks Phineas into giving up the location of Alcyoneus' lair, but it involves using himself as blackmail against Gaea and gambling that she'll come through for him. It works.
Annabeth pulls off a beautiful one in The Mark of Athena; it takes real nerve to talk your enemy into literally sticking her head into a trap, and that's after getting her to make the trap in the first place.
Beauty Is Never Tarnished: Being claimed/blessed by Aphrodite invokes this. Piper tries her hardest to mess her appearance up, but her looks just keep fixing themselves for days afterward, to Piper's irritation.
Big Damn Heroes: Percy, Frank, and Hazel and the Amazons during the invasion of New Rome.
Blessed with Suck/Cursed with Awesome: A good portion of the main cast has to deal with powers that can be either crappy or awesome, depending on the situation.
Leo, in addition to his technological talent, has fire powers. Great for fighting monsters, right? Yeah, except for the fact that said powers are difficult to control and extremely dangerous. Just ask Leo's mom. Oh, wait, you can't: she died in a fire started by accident by her son. And Apparently the last son of Hephaestus with the ability started the Great Fire of London. So that should give you an idea of what we're dealing with here.
Hazel can summon precious minerals from underground as per her mother's wish. While the ability has come in useful before, it absolutely ruined her first life, as the stones curse anyone who holds onto them...
Frank Zhang could darn well be the Trope Codifier for both. His life force is tied to a stick, and if it burns down completely, he dies. However, the fire from the stick has been shown to be able to free Death himself; who knows what other awesome stuff it could do. His Animorphism powers don't count, being just plain awesome without side affects.
Break the Cutie: Leo's mom's death. Later, Festus dying on Leo.
Hazel's flashbacks.
Broke Your Arm Punching Out The Titans: The gods of Olympus are in no shape to fight a war against the giants precisely because they're still broke from fighting the Titans and Typhon.
Call Back: Ma Gasket shows up in Son of Neptune wanting revenge on Jason, Leo, and Piper. Percy also shows up to reclaim his place as a main character after being absent for the first book.
"We've got a dam hole." And this one is from the original series.
When Percy shows up again after falling off a giant cliff to kill the roman shades and Hazel and Frank are surprised he mentions that he's fallen from higher, which was another reference from the first series.
Cherry Tapping: Bacchus technically pulls one of these on the two giants after spectating Percy and Jason beating them down for him. He simply steps in after they're done and, after a brief appeal to the crowd of ghosts whether he should or shouldn't, he simply bats them on the nose with his pine-cone staff, finishing them.
Chekhov's Gag/Brick Joke: Five books later, Annabeth proclaiming the Laistrygonian giants to be "Canadians" in Sea of Monster is brought back up in Son of Neptune where Percy calls them Canadians... in front of genuine Canadian Frank Zhang. Frank is not pleased.
Chekhov's Gun: The bronze dragon. Festus first appeared in the shorty story collection "The Demigod Files."
And now Terminus. Seemingly a one-off gag, but then comes back in the climax to help Percy defeat a Giant.
Gorgon blood.
Chinese Handcuffs.
The Chosen One: All of them were chosen by fate for their talents/gifts. No room for tag-along kids or the load.
And the bronze dragon also makes its first appearance in The Demigod Files.
Also, while shopping in Medea's shopping mall, a bronze breastplate that is corroded with acid is mentioned along with other merchandise belonging to deceased campers. It likely belonged to Silena or Clarisse.
The Armor coupled with Aphrodite's conversation with Piper doubles as Fridge Brilliance when you realize that Aphrodite was most likely referencing Silena when she held up the armor.
Nereus, the old man of the sea, last seen in Titan's Curse, makes a blink-and-you'll-miss-it but funny cameo in Son of Neptune.
Vitellius, in Son of Neptune, asks whether or not Percy cleans stables during their first conversation. Since Percy's memory has gone, he can't remember that he did in Battle of the Labyrinth.
In Mark of Athena, Percy decides against telling some water nymphs who have been trapped that the nature God, Pan is dead, something he personally witnessed in The Battle of the Labyrinth.
Also in Mark of Athena, Percy compares the problem with the doors of death to having a 'dam hole'. When the characters ask what he means he says it was an inside joke.
Cool Horse: Percy, Jason and Hazel all have cool horses. Blackjack (a giant black Pegasus), Tempest (a storm spirit who happens to look and act like a horse) and Arion (fastest horse alive, capable of breaking the sound barrier, his favorite food is the cursed gold Hazel sometimes unintentionally summons)
Cool Boat: Percy blatantly calls the Argo II the most incredible ship he's ever seen. Averted by the beat-up dinghy that constitutes the entire Roman navy.
Hazel: "I didn't even know we had a navy."
Cool Sword: Jason's Imperial Gold sword, which can also turn into a javelin- see Swiss Army Weapon. Sadly, it broke during the fight with Enceladus.
Crazy-Prepared: The Zhangs have an armory in their attic that's almost as well stocked as the one at Camp Jupiter. They have everything from swords, bows, arrows, spears, even potato launchers for taking out earthborn. It comes in handy. (Don't forget the water-hose on the roof!)
Creator Provincialism: Noticeable aversion in comparison to the first series. Instead of all America, all the time (with a few digs at Canada), Heroes of Olympus looks set to be much more international: a Chinese-Canadian main character (complete with an exceedingly rare tip of the hat to Canada's military) a book cover set against the Quebec City skyline, a climactic moment in British Columbia, and a quest that looks set to take the heroes back to the original Rome and Greece.
Crossover Cosmology: When meeting his dad for the first time in a dream, Leo exclaims, "Holy Mother!" Hephaestus chides him, "It's 'holy father', boy. I would think you'd know the difference."
Topped in The Son of Neptune by rainbow goddess Iris, who hasn't quite decided whether her personal creed should be...Buddhism or Taoism. Amusingly, Buddhism canonically sees nothing wrong with being a god and Buddhist at the same time.
Doting Parent: Mars (a marked contrast with his Greek counterpart, Ares), Hephaestus, and Hades/Pluto all take time to speak to their children even when Zeus has forbidden it.
Easy Amnesia: Zigzagged. Both Jason and Percy have their memories stolen by Hera/Juno, but get them back a few days after joining the other camp of demigods. Jason joins the Greeks almost immediately after waking up with amnesia, but only gets most of his memories back at first. The rest take presumably months to return. Percy wakes up with and spends roughly two months with only the faintest memory of Annabeth and little else, but gets all of his memory back pretty much all at once. While this is appropriate, as Jason needed time to learn to trust the Greeks while Percy’s Fatal Flawallowed him to trust the Romans quickly, YMMV as to whose amnesia was easier. Percy's memories returning quickly was also partly caused by his drinking gorgon's blood.
The Beast Master: Frank. Less well known but an 'elemental' power nonetheless, controlling nature and animals.
Eternal Recurrence: How many times do you think the Titans and giants will keep going after the Olympians?
Invoked with Monsters, which regenerate to be fought again, and with immortals, as they don't change (much). Addressed further in The Kane Chronicles, which share a universe.
Everything Sounds Sexier in French: Aphrodite apparently thinks so. Children of Aphrodite can speak and understand French. Why? Because it's the language of love, of course.
Subverted in Son of Neptune. Frank and Hazel try to talk to each other in French, but they’re pretty bad at it.
Is it because Canadian French and Creole French are somewhat different?
Hedge mentioned that "Fauns are Roman." Seeing as how Roman demigods are quite different from their Greek counterparts, it wouldn't be surprising if this was the case with other magical creatures.
Possibly justified. They could have indeed become more or less the same if people began to believe that they were with different names. In the first series, it was said that the Titans Helios and Selene faded after the Romans reassigned their duties over the sun and moon to Apollo and Artemis, so it's not unprecedented for them to have been blended them together into the same creature/species.
And as of Son Of Neptune, we've seen fauns, and they are, in fact, not the same as satyrs, to Percy's confusion.
Fire-Forged Friends: Played with. Leo and Piper think they've been friends with Jason for a while, but even when this is proven to be false, they're still tight from the time they have spent together.
The Sixth Ranger: Hazel, who has returned from the dead and doesn't always understand modern customs. Also doubles as The Chick and The Big Guy.
Foreshadowing: When Reyna summons Percy to a private meeting with her in the principia, he sits in the other praetor's chair while waiting for her.
The Mark of Athena brings up a few times the fact that all children of Athena are afraid of spiders.
Gaias Revenge: In the literal sense. Gaea seeks to take revenge on the gods for usurping her children, the Titans. Interestingly, she does not have nature-based powers, as in the original mythology this was the domain of Pan.
Genius Ditz: Quite a lot of characters, including Leo, Frank, Percy, and Ella.
Gentle Giant: In their native home, the Hyperborean giants are peaceful. Percy and Co. are still use one to help them escape from some griffins.
Much of Percy's interpreting for Arion consists of this.
In "The Lost Hero", it mentions that Drew dumped, "everything from the bathroom waste bin- some pretty nasty things- all over the floor".
Also, Piper's father says that he thinks "That Indian and Greek stuff is all bull "
In The Son of Neptune, the Amazon, Kinzie, blatantly flirts with Percy, telling him if he ever needs a new girlfriend, she's available. While we're never told exactly how old Kinzie is, it's safe to assume she's an adult (since not many teenagers can get jobs as security guards), whereas Percy is only sixteen.
From The Mark of Athena we have one scene where Percy and Annabeth fall asleep together on the ship. With some of the dialogue, one has to wonder if the original scene was a Sexy Discretion Shot so that Riordan could get it past the radar.*
To make things even more scandalous, Leo is just grinning and shaking his head in a way that screams Did You Just Have Sex?, and Hazel is scandalized, because she was from the 1940s.
Annabeth: We just fell asleep together! We didn't do anything.
Percy: We kissed a few times...
Annabeth: Not helping!
Percy referring to Ephialtes as "the Big F."
Good Scars, Evil Scars: Jason has a little one on his lip from trying to eat a stapler when he was two. Lit, Midas' son and bodyguard is covered in them.
G-Rated Drug: Dakota, a son of Bacchus, is addicted to Kool-Aid. With three times the normal sugar.
Have You Seen My Gods: Olympus has been closed and the gods have gone MIA. Subverted. Even though Zeus ordered it, thinking it would lull Gaea back to sleep, several of the gods, thinking Zeus is making a mistake, have defied his orders. They had to do so covertly, however.
In The Son of Neptune he seems to have changed his mind (or bowed to the inevitability of the others meddling making the plan moot), allowing Mars to order a quest.
"Hell Yes" Moment: The Fifth cohort after Percy, Hazel, and Frank storm the defenders’ fortress during the war games. The entire legion, especially Reyna, when they pull a Big Damn Heroes during the invasion. Not to mention "TWELFTH LEGIONFULMINATA!"
Heroic Sacrifice: Percy is initially thought to have killed himself to take out a ghost army that threatened Hazel and Frank. Then, after defeating Alcyoneus, they go back to the glacier only to find Percy there, totally unperturbed at bringing a glacier down on himself.
Played Straight in The Mark of Athena when Percy(he really does tend to do this often) throws himself down to Tartarus to protect Annabeth. And there are only a few thousand supercharged monsters in his path!
Historical In-Joke: The American Civil War (1861-1865) was at least partially a war between Roman half-bloods and Greek half-bloods.
The last child of Hephaestus that could create fire before Leo was Thomas Faynor, who started the Great Fire of London in 1666.
Frank's ancestor was blamed for the 1906 San Francisco Earthquake, though it turns out he didn't do it.
Jack London was a son of Mercury whose Wolf House burned down because it was built on sacred ground.
Amazon.com Inc. was apparently founded or taken over by actual Amazon warriors and used to ship goods to Amazons worldwide.
Johnny Weissmuller, US National Championship and Olympian (the sport version) swimmer, was apparently a merman trained by the ichthyocentaurs).
Holding Hands: Percy and Reyna after they defeat the invasion and he gets promoted to praetor.
Everyone who's paired off by book three. And by "Everyone" we mean "Everyone except Leo". Mostly.
A House Divided: The Greeks and Romans need to ally themselves so they can defeat Gaea. Otherwise, they are SCREWED.
Human Popsicle: Quite a few, from those in Boreas' fortress and the Hunters for a short time during the battle at the Wolf House. Midas' "house guests" probably count, too.
It Belongs in a Museum: Piper initially believes this of the dagger she gets from Annabeth (it had once belonged to Helen of Troy). Annabeth tells her that they're surrounded by Ancient Greek stuff at camp, but weapons like that are the heritage of the demigods and are meant to be used.
Locked Out of the Loop: The gods, Chiron, and Lupa are keeping a big secret. The Lares of Camp Jupiter, too.
A bit of story hints is that Chiron never mentioned the Roman camp because he swore not to - chances are, Lupa wouldn't mention the Greek camp either.
Nico has been keeping the secret as well; Percy in particular is less than thrilled by this.
Long Lost Relative/Everyone Is Related: Jason and Thalia have the same mother, as well as being kids of the same god (Jupiter/Zeus respectively) but in different aspects.
Hazel is Nico’s sister and Frank turns out to be a descendent of Poseidon, so Percy and Tyson adopt him as their brother.
Leo is related to Sammy Valdez, Hazel's boyfriend from back during World War 2—specifically, he is Sammy's great-grandson.
Heracles & Chrysaor to Jason and Percy. They try to kill each other.
Loophole Abuse: The Amazons get their queens crowned by fights to the death. Given the whole death thing, there's no law against repeat matches- so when an old queen comes back from the dead wanting a rematch (and being able to return even if she dies in battle), you can bet that Hylla was going to get out her law-fu ASAP.
New Powers as the Plot Demands: On a series level, not within the series. Apparently certain children of Hephaestus can wield fire and all children of Aphrodite have apparently always been able to speak French, and some can charm-speak people into doing what they want. Justified as it's stated that controlling fire and charmspeaking are ridiculously rare, though some fans still think Aphrodite's children speaking French came from left-field.
There was only one named camper from the Aphrodite cabin in the first series, and she was never in a situation where speaking French would have been remotely helpful. Combining that with the fact that Piper seemed honestly surprised she could speak it, and it's fairly justified.
It was also never really delved into in the first series just what powers were granted to each god's children, and they seem to vary quite a lot among themselves as well.
Official Couple: Played with as of Son of Neptune. Hazel and Frank share a kiss after defeating Alcyoneus, but we don’t know if they’re officially going out by the end.
Percy and Annabeth. Later, it seems Jason and Piper have become this as well.
Oh Crap: Alcyoneus after Frank and Hazel drag him into Canada. Polybotes when he realizes that Percy’s got a god on his side.
One-Man Army: It was mentioned that Greek Heroes are trained to handle things solo compared to the Romans who rely on military teamwork. Percy's fighting style is repeatedly mentioned to be un-Romanly because of this.
One Steve Limit: Averted; though it'd be very hard to confuse, Midas mentions his daughter being named Zoe (not to be confused with the first series' Zoë Nightshade).
There's also a Jason at Camp Half-Blood playing Capture the Flag in Titan's Curse.
Only The Knowledgable May Pass: The ghosts think they have this. In fact, Annabeth guesses and bluffs most of it, though she does have the advantage that many of their "mysteries" were hinted at in the decor.
Arguably, while she does have feelings for Jason, it may not have had anything to do with that— she simply Charmspoke his soul to keep it from going to Hades. Still technically fits the trope, since only children of Aphrodite, goddess of love, can do this...
It was revealed in the second book that the Doors Of Death are open and heroes can escape death for the same reason that monsters reform almost instantly. The Power of Love probably helped, but Gwen got back by herself, so...
Throughout the whole of Mark of Athena, the seven of them regularly form into different Power Trios
Precision F-Strike: Except that the word "freaking" is used instead of the normal phrase. Going toe-to-toe against an ice goddess is definitely one of Leo's Crowning Moments Of Awesome.
Lampshaded by Octavian who insists that Mars' prophecy rhyme and be cryptic and vague. Mars pulls out a grenade.
Prophecy Twist: Spoofed by Mars in Son of Neptune. When asked by Octavian for a prophecy, a cryptic poem to guide the quest, Mars writes down the most bluntly straightforward prophecy ever with absolutely no ambiguity whatsoever.
Put on a Bus: As the series is an ensemble, focusing on several new characters as well as old ones, many of the main characters from the original Percy Jackson series take on secondary or cameo roles in the first two novels.
Race Against the Clock: Before solstice! Before the Feast of Fortuna! Before Nico suffocates! Before Percy and Annabeth die to thousands of the worst monsters in history!
Raised by Wolves: Camp Jupiter, specifically by the wolf-goddess Lupa who raised Romulus and Remus
Real Men Wear Pink: Minor character Butch, a bulky dude with a shaved head and a face like a pile of bricks. His mother is Iris, the Rainbow Goddess. Got a problem with that?
Rummage Fail: When facing off against Lycaon, a nervous Leo reaches into his tool belt for a weapon and initially grabs breath mints before hastily swopping them for a hammer. He hopes no one noticed. This is turned into a Brick Jokeseconds later when the perspective switches to Jason, and while evaluating his assets, he thinks about "Leo, who apparently thought he could defeat the armies of darkness with breath mints."
Sadistic Choice: In the second excerpt of Son of Neptune, "June" (Juno) tells Percy that he can endure suffering and tragedy and maybe save his friends, or live happily under the ocean while the world ends.
Jason and Percy become possessed by ghosts and attack each other. Piper is ordered to decide which one will survive.
Also keeps with the History Repeats theme of the series, as Hercules/Heracles was offered essentially the same choice.
Several characters outright state that Percy’s gonna have to make another one sometime in the future, but likely won't be able to, due to his fatal flaw: loyalty to his friends above all else.
Save Your Deity: Jason, Piper, and Leo have to rescue Hera before the solstice.
Sealed Good in a Can: Percy was kept asleep by Juno for several months until the time was right for him to go to Camp Jupiter.
Hazel's time in the Underworld also qualifies.
Secret Test of Character: Percy thinks "June" is trying to put him through one in the beginning of Son of Neptune.
Hazel thinks it's a test too - she orders Frank not to fire, because she thought Percy was a god in disguise.
Self-Made Orphan: Subverted and very tragic. Leo killed his mother by accident after Gaea tricked him.
Hazel killed her mother and herself to stop Gaea from raising Alcyoneus back in 1942.
Seven Token Band: So far, the seven demigods of the prophecy include a Native American girl (Piper), a Latino (Leo), a Chinese-Canadian (Frank), a black girl (Hazel), and two white guys and a girl (Jason, Percy and Annabeth).
Particularly jarring when compared to the first series, where there were almost no minority characters. Makes some sense, as Rome was much more diverse then Ancient Greece.
Ship Tease: Percy and Reyna as well as Reyna and Jason. While she and Jason weren’t a couple, Reyna is shown to be fond of him. It's also fairly common for praetors to become romantically involved. Then Jason disappears for eight months and Percy becomes the new praetor.
Bacchus incorrectly refers to Jason Grace as John Green.
Shown Their Work: Rick Riordan has been around in real life, and used to be an editor for mythology books. And it shows.
He actually gets a lot of common misconceptions correct, such as how Thanatos is actually Death itself, and that Pluto was not just the lord of the underworld but also the god of wealth and the earth.
Steampunk: Leo describes the Hephaestus cabin as steampunk. The term also applies to Festus.
Summon Bigger Fish: Summon Hyperborian giant, actually. (Or at least run underneath one.)
Summon Magic: Frank's godly parent gives him a spear tipped with a Dragon's Tooth that can be used thrice. Breaking it off in the ground creates a zombie warrior roughly akin to the Terminator.
One can expect Nico to pull this off with much gusto in The House of Hades next year.
Swiss Army Weapon: Jason's weapon begins as a gold coin; a toss causes it to become an Imperial Gold sword or javelin on heads or tails respectively.
Switching P.O.V.: Each character gets their turn to have their perspective told (from a third-person limited POV). To help with this, in lieu of chapter titles Riordan just puts "[CHARACTER NAME]" in ALL CAPS.
Tropes T-Z
Taking You with Me: Averted. Hazel and Frank are afraid Percy’s done this to get rid of the Roman shades in Alcyoneus’ lair, but the readers know he’s fine because his water gifts will protect him from the fall.
Played straight during Hazel's first life, when she discovers she was being manipulated by Gaia into reviving Alcyoneus, the giant. She uses her powers as a daughter of Pluto to bring down the cave where the giant was forming, killing herself, her mother and effectively delaying the giant's revival for several decades.
Hannibal the elephant for Camp Jupiter as a whole.
Teeth-Clenched Teamwork: There is quite a bit of animosity between Hera and more than a few demigods, particularly Annabeth and Thalia, but as Piper points out, they will have to work together to beat the Giants and Gaia.
Textile Work Is Feminine: Subverted. Annabeth has to weave, but it is part of a deadly test and is not presented as feminine.
Also in "The Son of Neptune" with Percy (white), Frank (Asian), and Hazel (black).
Too Dumb to Live: Alcyoneus, as pointed out by Frank - when you're unkillable as long as you stay in the boundaries of the state of Alaska, you really shouldn't hang out in the part of the state that's only 10 miles wide.
Frank:Welcome to Canada. Idiot.
Touché: Gaea’s grudgingly impressed by Percy's gamble to force her to choose him over Phineas.
Unusually Uninteresting Sight: Lampshaded when Percy runs through traffic with "June" Juno in Son of Neptune, most of the drivers, "just swirved and looked irritated, as if they had to deal with a lot of ratty teenagers carrying old hippie women across the freeway." It's The Mist again.
Walking Wasteland: Hazel's life gives off this vibe. Wherever she goes, cursed gems and gold emerge from the earth that could kill innocents who picked them up. Pluto seemed to imply that most of his children are like this to some extent, Hazel just takes it Up to Eleven.
White Male Lead: Subverted in Son of Neptune - Frank is the official leader of the quest.
Window Love: Piper and her father after he's lost his memory do this through a video chat, with their hands touching on "opposite sides" of the computer screen.
The Windy City: Although Riordan doesn't seem to realize that Chicago is called the "Windy City" because of blustering politicians, not the weather. It is windy, though. Especially in the winter, when it's also freezing cold. Also, perceptions are important in this series, so if people think that Chicago is literally windy, that's where the Wind will go.
With This Herring: The only formal aid the Roman Senate gives Percy, Frank, and Hazel on their quest to save Camp Jupiter in Son Of Neptune is the piece-of-crap dinghy that sinks outside of Seattle.
World Of Pun: Riordan being Riordan, almost as frequent as snarking. Special mention goes to Lupa, directed to Jason: "As always, you are our saving Grace."
Worf Effect: The Giants. Despite being stated to be the greatest threat Olympus has ever faced and three revealed being so far created as direct counters to the most powerful Olympians they have all be defeated fairly easily. Possibly justified in Porpheryion at least was not at full power. That and Percy is just that badass, so a villainous example of Overshadowed by Awesome?
Wrench Wench: Leo's mom and his half-sister Nyssa.
You No Take Candle: Somewhat subverted with Ella, who despite her intelligence speaks like this because she is a harpy and that's just what they do.
You Are Worth Hell: The end of Mark of Athena ends with one of these, with Percy getting dragged down to Tartarus with Annabeth instead of just letting her go.
Series Tropes
Setting tropes imported from the previous series (elaboration on the original series' page):
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