the-french-artist/wikipedia_20220301.simple_sentence_split huggingface dataset:
They meet the satyr Grover Underwood on the way.
She has a younger brother, Jason Grace who was separated from her when she was 10.
This became the reason she ran away from home.
She wears a lot of dark makeup and punk style clothing.
She has electric blue eyes and spiky black hair.
She is so like Percy that according to Annabeth, they either could be best friends... or worst enemies.
Luke Castellan is one of Hermes's children and a major antagonist of the series.
Though initially the counselor of Cabin 11 and an ally to Percy, he revealed his true nature as a high-ranking member of Kronos's army by attempting to kill Percy at the end of The Lightning Thief, and on several occasions afterward.
His mother had been driven crazy upon attempting to become the Oracle, leading to a stressful childhood.
After reforming, Kronos does not need Luke's assistance.
However, in his duel with Percy on Mount Olympus, striking Annabeth reminds him of his promise to protect her.
This temporarily frees him from Kronos's influence.
Percy makes his choice to give Luke Annabeth's knife, and Luke, cursed by the broken promise, kills himself by stabbing his own Achilles heel to destroy Kronos.
This fulfills the prophecy, with Luke being the foretold hero.
In the film, Luke is portrayed by Jake Abel.
Greek/Roman gods
Zeus/Jupiter - The King of the Gods, God of the Sky, Zeus is brother to Poseidon and Hades, uncle to Percy, father of Thalia, son of Kronos.
His Roman counterpart is Jupiter, brother to Pluto and Neptune, and father to Jason.
His cabin is Cabin 1.
Poseidon calls Zeus dramatic, saying that he might do better as the God of the Theater.
His symbol of power is his Master Bolt.
In The Lost Hero, Zeus (under the influence of Khione) forbids contact between gods and mortals and closes down Olympus.
Despite this, Zeus indirectly aids the demigods several times on their quest, such as answering his son's prayer for aid against Enceladus.
Hera/Juno - The Queen of the Gods and the Goddess of Marriage.
Hera plays a small role in The Titan's Curse but is one of the gods who help Percy and the others in their quest in The Battle of the Labyrinth.
She especially dislikes Annabeth and curses her like how Ares cursed Percy in the 1st book.
She thought Luke, Pan and Daedalus were better off gone.
Cabin 2 at Camp Half-Blood is dedicated to her, but is perpetually empty; as the goddess of marriage, she has not given birth to any demigods.
In spite of this, Hera meddles with the affairs of many demigods.
In The Last Olympian she has a minor role where she congratulates Percy on his victory rather disdainfully and says that she would have to let him and Annabeth live a little longer.
She returns as Juno in The Lost Hero in which Percy Jackson has disappeared.
She has been kidnapped by Gaea and contacts Jason Grace, the new protagonist and asks him to help her.
It is then revealed that as Juno, she snuck out of Olympus and exchanged Percy and Jason to try and unite the Roman and Greek demigods.
She goes against the wishes of Zeus in this regard because she wants to save everyone – gods, demigods and mortals from the new evil.
Juno also admits that she is bitter towards heroes and demigods because she does not have any of her own.
Juno, Hera's Roman counterpart, is more warrior-like and more disciplined and rebellious.
Juno even states that Hera would not have disobeyed Zeus, but Juno would.
Aphrodite/Venus - The Goddess of Love, Beauty, Lust, etc.
Her children (mostly girls) live in Cabin 10.
She wears a red satin dress and has long dark-brown hair in ringlets, though she sometimes wears it down.
Aphrodite is also the last child of Ouranos.
Aphrodite is also the mother of Piper McLean, a main character in The Lost Hero, and changes her daughter's tomboyish appearance twice to make her more beautiful.
Apollo - The God of the Sun.
The campers in Cabin 7 are his children.
He appears to be about 18 or 19 years old and has sandy colored hair and dazzling white teeth.
Percy notes that he looks similar to Luke, but less evil.
Apollo helps Percy and his friends by flying them to Camp Half-Blood in The Titan's Curse and later speeding up a train while being disguised as a homeless man.
At the end of the war between the Titans and the gods, Rachel is certified as the new Oracle by Apollo.
His name is both Greek and Roman.
Ares/Mars - The God of War and Bloodlust.
His children are the campers in Cabin 5.
Ares drives a large, black, Harley-Davidson motorcycle with a flame-pattern paint job, a boar themed antenna, handles, boars head shaped red headlight and a leather seat made from human skin.
He wears red wraparound sunglasses that cover his eyes, which are flames, a bulletproof vest, combat boots, black leather biker clothes, and a black leather duster.
Ares returns with minor roles in The Sea of Monsters and The Titan's Curse.
He is seen at the end of The Last Olympian after giving Clarisse a blessing during battle and is very proud of her.
Artemis/Diana - The Goddess of the Moon, Wild Animals, and the Hunt.
She is the twin sister of Apollo.
Cabin 8 at Camp Half-Blood is dedicated to her, though it is unoccupied, except for the rare visits when her group of huntresses stays at the camp, such as in The Titan's Curse.
She is a maiden goddess and bears no demigod children.
She has auburn hair and silvery-yellow eyes, the color of the full moon.
Artemis leads a group of teenaged girls known as  the Hunters of Artemis.
She is trapped by Atlas and is forced to hold up the sky.
She speaks up for Percy, Annabeth and Thalia at the Council of the Gods and votes for Percy to live.
Artemis did not follow Zeus' order to not have contact with mortals by still communicating with her Hunters.
Thalia states, "Artemis follows her own rules," even though she does this without Zeus' knowledge.
She sent Thalia to find Jason, her long-lost brother.
Athena/Minerva - The Goddess of Wisdom and Battle Strategy.
She first appears in The Titan's Curse, where she is shown to dislike Percy and his relationship with Athena's daughter, Annabeth.
She has intense grey eyes, as do almost all of her children who reside in Cabin 6.
In The Demigod Files, she has black hair, but in other books, she is depicted as having blonde hair, like her children.
Demeter/Ceres - The Goddess of the Harvest.
Demeter made three brief appearances along with her daughter Persephone in The Last Olympian, notably when she participates in the battle against the Titans.
Her children reside in Cabin 4.
Dionysus/Bacchus - The God of Wine and Madness.
He is Percy's cousin and the father of Castor and Pollux.
He is the director of Camp Half-Blood where he was sent by his father Zeus for chasing an off-limits nymph though he is married.
At Camp Half Blood, he is known as "Mr. D." He is shown to hate his job and have a low opinion of demigods stemming from Theseus' abandonment of Ariadne, but he has to remain at Camp Half-Blood for another fifty years (his punishment used to be 100 years, then Zeus shortened it).
His children live in Cabin 12.
He rarely bothers to call the campers by their proper names, making a point of calling Percy Jackson names such as "Peter Johnson", "Perry Johannson", or "Pierre Jorgenson" throughout the series.
He also calls Annabeth "Annie Bell" or "that Anne girl", regardless of the fact that she has been in Camp Half-Blood since she was seven years old.
Though he has said that Percy "always manages to annoy him," he has saved Percy's and Annabeth's life several times.
Hades/Pluto - The God of the Underworld, son of Kronos, brother to Poseidon and Zeus.
He is the husband of his niece Persephone and is Nico and Bianca di Angelo's father.
After the war, Hades, along with the minor gods, is given a cabin in Camp Half- Blood
Hephaestus/Vulcan - The Gods' Blacksmith and God of Fire.
His children reside in Cabin 9.
He is the father of Charles Beckendorf and Leo Valdez.
He was thrown off of Mount Olympus when he was born because Hera thought he was hideous and wanted a "perfect" family, though Hera denies it.
Hephaestus says that Hera likes telling the story that Zeus threw him off the cliff because "it makes her seem more likable."
He defied Zeus' rule in The Lost Hero and spoke to his son.
He also took the head of Festus to Bunker 9 for Leo.
Hermes/Mercury - The Messenger of the Gods and the God of travelers, Communication, and Thieves.
He is bitter about Luke's situation and gets angry at Annabeth in The Last Olympian for not saving him when she had the choice.
All of his children and any half-bloods of undetermined parents stay in Cabin 11.
Hestia/Vesta - The Goddess of Hearth and Home.
Percy offers Pandora's jar to Hestia, as she is the Last Olympian and Hope survives best at the hearth.
She later helps Percy when he battles Kronos by making her hearth painfully hot for Kronos when he reaches to get his scythe when it fell into the flames.
When Percy looks into her eyes, he can sometimes see the past or the future, like what happened before Annabeth, Thalia and Luke came to Camp Half-Blood.
Poseidon/Neptune - The God of the Sea, Earthquakes, Storms, and Hurricanes and the creator of the horse.
He is Percy's father and his children (Percy's half-siblings) reside in Cabin 3.
His symbol of power is the trident
Aeolus - The custodian of the Four Winds.
In "The Lost Hero," Aeolus is shown to have gone crazy filling out the gods' weather requests and wants Zeus to make him a god.
Amphitrite - The Queen of the Seas, wife of Poseidon, and daughter of Oceanus.
In The Last Olympian, Amphitrite alongside Triton is seen talking strategy with her husband Poseidon in the throne room of their ocean floor palace.
Percy Jackson joins them and Amphitrite treats him coldly as he is a reminder of Poseidon's unfaithfulness.
Percy expects nothing else and feels sorry for her as she does not have a faithful husband.
She is worried about how her father is attacking and how Poseidon is losing power to the Titan of the Sea.
Amphitrite is a beautiful goddess, with flowing black hair and small horns like crab claws.
Boreas - The God of the North Wind.
In The Lost Hero, Jason, Piper, and Leo meet him in his palace when they come to him for help.
Boreads - Calias and Zethes are the sons of Boreas.
In The Lost Hero, they are seen when Jason, Piper, and Leo arrive at Boreas' palace.
Deimos - The God of Terror and the son of Ares.
He appears in "Percy Jackson and the Stolen Chariot" in The Demigod Files.
Deimos and his brother Phobos steal Ares' war chariot from Clarisse.
East River - The minor God of the East River.
Hebe - The Goddess of Youth.
Hecate - The minor Goddess of Magic.
Hudson River - The minor God of the Hudson River.
Hypnos - The God of Sleep and father of Morpheus.
In "The Lost Hero," it shown that Hypnos has his own cabin.
Clovis is one of Hypnos' sons.
Iris - The Goddess of Rainbows.
She does not appear in the series, but later on gets her own cabin at Camp Half-Blood.
In The Lost Hero, she is revealed to be the mother of Butch.
Iris is said to be on good terms with Chiron and Hermes.
Janus - The God of Gates, Doorways, Beginnings and Endings.
He appears as a minor character in The Battle of the Labyrinth where he offers Annabeth a choice between two doors, which represents the situation she was in when she had to make the decision about saving Luke's soul.
He is also mentioned when Percy Jackson has a dream of Deadalus.
Janus makes him choose to become a murderer, which he must bear a burden for as long as he lives.
Khione - The Goddess of Winter and daughter of Boreas who appears in The Lost Hero.
Jason, Piper, and Leo encounter her in Boreas' palace.
She ends up betraying them to help Gaia in her conquest.
Morpheus - The God of Dreams[son of Hypnos].
He also puts Grover to sleep for two months, after he tries to defend the forest of Central Park.
Melinoe - The Goddess of Ghosts.
She appears in The Demigod Files in the short story "Percy Jackson and the Sword of Hades".
Nemesis - The Goddess of Revenge and Balance.
She never makes any actual appearances in the books, but she is the mother of Ethan Nakamura who appears in The Battle of the Labyrinth and The Last Olympian.
Pan - A Satyr who is the God of the Wild.
Persephone - The Goddess of Springtime and Queen of the Underworld.
Her parents are Demeter,and Zeus.
Hades only allows Persephone to visit her mom in the spring and summer.
Unlike most minor Gods, Persephone fights with the Gods during the battle against the titans.
Phobos - The God of Fear and the son of Ares.
Phobos and his brother Deimos steal Ares's war chariot from Clarisse.
He shows Percy his greatest fear, which is Camp Half-Blood catching on fire and burning, when they are fighting in an aquarium in a zoo.
Pompona - The Roman Goddess of Plenty.
Thanatos - The God of Death.
In The Demigod Files, King Sisyphus made a reference to him when Percy, Nico, and Thalia visit him.
Triton - The Sea Messenger God and the son of Poseidon and Amphitrite.
He is depicted as a mermaid with two fish tails.
In The Last Olympian, Triton was with his parents talking strategy revolving on Oceanus' war on Poseidon.
He is shown to be cold and arrogant to Percy, but respects Tyson.
Tyche - The Goddess of Fortune.
At Camp Half-Blood, her children reside in Cabin 19.
According to Rick Riordan's website, Tyche is the most difficult Goddess to find.
Aigaios - The Titan of Sea Storms.
Like Oceanus, he did not fight in the first war.
In The Titan's Curse, Aigaios was mentioned by Tyson to be assisting Oceanus in protecting the Princess Andromeda from Poseidon.
Atlas - The Titan General.
He is the father of Calypso and Zoë Nightshade.
Helios - The Titan of the Sun and son of Hyperion.
In The Titan's Curse, Apollo mentioned that he and Selene faded due to the Romans being too lazy to build their temples and make sacrifices to them.
Hyperion - The Titan of Burning Light and father of Helios and Selene.
He was defeated by Grover Underwood and trapped within a giant maple tree.
Iapetus - The Titan of Mortalilty, Pain and Death.
He accompanies Ethan Nakamura in the Underworld in an attempt to steal the Sword of Hades in The Demigod Files.
Krios - Krios is the Lord of the South and the Titan of Stars and the Constellations.
He is only mentioned in one of Percy's dreams, where he is forced to babysit Atlas.
In The Lost Hero, Jason mentions that he defeated Krios with his bare hands.
Kronos - The Lord of the Titans and the main antagonist of the first series.
He is the father of Zeus, Poseidon, and Hades, Chiron, and grandfather of Percy.
His weapon is a scythe, a "six-foot-long blade curved like a crescent moon" as said in The Battle of the Labyrinth.
It is hinted in the book that it is Luke's old sword Backbiter remade into the scythe.
When he eventually reforms himself, he takes matters in his own hands.
The only reason Luke was not killed was because of his loyalness to Kronos.
Later, Annabeth and Percy save Luke, and Luke sacrificies himself.
Oceanus - The Titan of the Ocean.
In this series, Oceanus is often depicted as having the upper body of a muscular man with a long beard and horns (often represented as the claws of a crab), and the lower torso of a serpent.
Prometheus - The Titan of Forethought (and as Grover says, "Crafty Counsel", with emphasis on "Crafty").
Selene - The Titan of the Moon and daughter of Hyperion.
In The Titan's Curse, Apollo mentioned that she and Helios faded due to the Romans being too lazy to build their temples and make sacrifices to them.
Enceladus - A Giant who was the first to be awakened in The Lost Hero.
He was killed when Jason and Jupiter threw lightning at him.
Porphyrion - A Giant who was the second to be awakened in The Lost Hero.
He fought Jason and his friends and was teleported away before Hera could finish him off.
Calypso - Calypso first appears in book four.
She is cursed with this as punishment because she supported her father, Atlas, the Titans in the first war.
She is immortal and lived on an island that makes anyone who lives there immortal for the time of their stay, though once they leave they can never come back.
Charon - Charon is the Underworld carrier through the River Styx.
Percy and his friends meet him in The Lightning Thief.
Chiron - In the series, he plays the part of the mentor and activities director to the main protagonist Percy Jackson and the other demigods residing at Camp Half-Blood.
Eurytion - A worker of Geryon and the owner of Orthrus.
Phoebe - The best tracker of Artemis' hunters.
She was supposed to go on the quest inThe Titan's Curse, but the Stoll brothers (at the request of Aphrodite) gave her a poisoned (but non-lethal) shirt that prevented her from going.
She appears in The Lost Hero.
The incident with the Stolls appears to have had a lasting effect on her; she appears to think that every boy wants to play a prank on her.
Zoë Nightshade - The lead Huntress of Artemis.
She is a former Hesperide.
but was blotted from history for aiding the half-blood Hercules in slipping past the dragon Ladon and obtaining a golden apple.
Bianca di Angelo - A daughter of Hades, Nico's older sister, Percy, Thalia and Jason's cousin and later, a Huntress of Artemis.
After Artemis is kidnapped in The Titan's Curse, she undertakes the quest to rescue her alongside Percy Jackson, Grover, Thalia Grace, and Zoë Nightshade.
She sacrifices her death and harbors hard feelings for him for a while afterward.
Butch - The demigod son of Iris who first appears in The Lost Hero.
He is the counselor of the Iris Cabin.
It is said he is the best equestrian at camp.
Castor - The son of Dionysus and the twin brother of Pollux.
Castor died at age 17 during the Battle of the Labyrinth when he was stabbed in the arm and hit on the head by an enemy demigod.
Charles Beckendorf - A son of Hephaestus, known to be able to build almost anything.
Christopher - The demigod son of Hephaestus who first appears in The Lost Hero.
Chris Rodriguez - A half-blood son of Hermes (as shown in "Percy Jackson and The Olympians The Ultimate Guide") who had gone to Kronos's side until having gone completely insane in the Labyrinth.
Clarisse finds him and brings him to camp where Dionysus makes him sane again.
Clarisse La Rue - One of the children of Ares and the head of Cabin 5.
Despite her brash nature, she is capable of compassion, shown when she cares for Chris Rodriguez, a half-blood who became a traitor and was later found crazed and stumbling within the Labyrinth in a bout of madness.
She and her cabin later fight with the Apollo cabin over a flying chariot.
Later, she prevents Cabin 5 from joining in the battle of Manhattan because of the chariot fight, though Michael Yew gives it to them.
Silena is killed by a drakon during this charade.
To avenge her friend, Clarisse  stabs the drakon in the eye, breaking her spear and electrocuting the drakon.
She then runs at Kronos's armies, appearing to be as invulnerable as Percy, even though she does not have the Curse of Achilles.
Clovis - The demigod son of Hypnos who first appears in The Lost Hero, where he tries to help Annabeth on how Jason Grace's memory was lost.
He is the counselor of the Hypnos Cabin.
Connor Stoll - One of the children of Hermes.
He is brothers to Travis Stoll.
Drew Tanaka - A demigod daughter of Aphrodite who first appeared in The Lost Hero.
She was the Cabin counselor after Silena, but was forced down by Piper McLean.
She is vain and sarcastic, and can also charmspeak.
Ethan Nakamura - A son of Nemesis who feels that his mother is unappreciated and fights for her.
Ethan's last words were "Deserve better...if they the minor gods just...had thrones..."
Harley - A demigod son of Hephaestus who first appeared in The Lost Hero.
Jake Mason - A son of Hephaestus.
He later steps down and gives the role to Leo.
In The Lost Hero, he was seen in a body cast after trying to catch Festus.
He resigned after Festus led Leo to Bunker 9.
Katie Gardner - A daughter of Demeter that is the head counselor for cabin four at Camp Half-Blood, as seen in The Last Olympian.
Miranda Gardiner is her deputy taking over in winter because Katie is not a year-rounder.
She fights in and survives the war between gods and titans.
Katie strongly dislikes the Stoll twins, because they once put chocolate Easter bunnies on the Demeter cabin's grass roof.
She is the cousin of Percy Jackson, Thalia Grace, Nico di Angelo and Bianca di Angelo.
Lacy - Lacy is a daughter of Aphrodite who befriends Piper McLean in "The Lost Hero".
Lee Fletcher - A son of Apollo.
He was the original head of Cabin 7 before he was killed by a giant in The Battle of the Labyrinth.
Lou Ellen - Daughter of Hecate, who was first mentioned in The Lost Hero.
She is known for playing magical tricks on fellow campers.
Malcolm Pace - A son of Athena.
His last name is never revealed.
Mark - A son of Ares.
Michael Yew - A son of Apollo.
He is described as very short, four foot six, with personality that makes up for his height, and a face that reminds Percy of a ferret.
In The Demigod Files, in an interview with Clarisse, she mentions that she would want to pulverize Micheal, thus stating that they are enemies.
Percy finds it very interesting that he's the counselor.
He is supposedly killed leading a group of demigods in the fight against Kronos' army.
Percy looked everywhere for him, but only found his bow.
He is presumed deceased, although this was never confirmed.
Miranda Gardiner - Miranda is a daughter of Demeter who first appears in The Lost Hero and is the counselor of her cabin.
Miranda had her nose (temporarily) removed by Lou Ellen, a daughter of Hecate.
Mitchell - Mitchell is a son of Aphrodite who befriends Piper McLean in "The Lost Hero".
Nyssa - Demigod daughter of Hephaestus.
Pollux - The son of Dionysus and the twin brother of Castor.
Reyna Avila Ramírez-Arellano - A Roman demigod, mentioned by Jason in The Lost Hero who might be his girlfriend at the Roman camp.
Silena Beauregard - A daughter of Aphrodite and the head of Cabin 10.
Silena is killed by a drakon when she fights it while pretending to be Clarisse in The Last Olympian.
It is also revealed in The Last Olympian that she was the spy giving Kronos information about what was going on at Camp Half-Blood.
When the Stoll brothers ask Percy about it, he will not let Silena be remembered as a spy.
She did, however, want to stop being the spy when her boyfriend Charles Beckendorf died (charming her with his looks, Luke had promised that fewer lives would be lost and that Charles would be safe), but was blackmailed by Luke when he threatened to reveal her betrayal.
Percy also notes that no one says the word "spy" during the burning of her shroud (which was hot pink with an electric spear embroidered on it).
Sherman - A son of Ares.
Travis Stoll - One of the children of Hermes.
He and his brother become the new counselors of cabin 11 after Luke went to Kronos.
Will Solace - He is a son of Apollo whom Percy took to heal Annabeth in The Last Olympian and become the leader of the Apollo Cabin as seen in The Lost Hero.
Mythological Characters
Achilles - The image of Achilles appears briefly in The Last Olympian, warning Percy about The Curse of Achilles.
Ariadne - Ariadne once helped Theseus when it came to him slaying the Minotaur.
When Theseus unknowingly left Ariadne on an island, she was found by Dionysus who took her on as his wife.
Theseus "abandoning" Ariadne was one of the reasons why Dionysus dislikes heroes.
Ariadne made an appearance at the end of "The Titan's Curse" where she was walking arm to arm with Dionysus.
Circe - Circe ran a magical beauty boutique in the Sea of Monsters.
She was glamorous and went by the alias of C.C. While she treated females at her spa, she turned males into guinea pigs.
When Percy was turned into a guinea pig, Annabeth managed to use Hermes' multivitamins to become immune to Circe's spells and escaped with the guinea pigs.
Not knowing which one is Percy, Annabeth fed them all multivitamins restoring Circe's victims to normal.
Daedalus - Inventor of the Labyrinth, son of Athena, and father of Icarus.
Daedalus killed his nephew Perdix and took his notes, which he then used to cast his animus (soul) into automatons after Athena branded him with the murderer's brand.
He later decides that it is time to go to the Underworld and leaves Annabeth his laptop which is filled with his notes and ideas.
Nico unleashes Daedalus' spirit which destroys the labyrinth.
When in the Underworld, King Minos tried to convince the other judges to punish him and fails.
Daedalus' spirit now works as the Underworld's architect while being able to visit Icarus and Perdix on weekends.
The Fates - The three women who control the threads of life.
Clotho - The Fate who spins the Thread of Life.
Lachesis - The Fate who measures the Thread of Life.
In "The Lightning Thief," Percy and Grover encounter them at an old-fashioned fruit stand.
In "The Last Olympian," the Fates take Luke's dead body away after the Second Olympian War.
Atropos - The Fate who cuts the Thread of Life.
Gaea - The embodiment of Earth, the mother of the Titans, Giants, and Antaeus, and grandmother of the Olympian Gods.
She serves as the primary antagonist of The Heroes of Olympus series.
King Lycaon - King Lycaon was a king who was turned into a wolf after doing deadly tests on Zeus.
In "The Lost Hero," King Lycaon appears where he meets Jason, Leo, and Piper in their search for Aeolus.
He and his werewolves were instructed to kidnap Jason and kill Leo and Piper.
King Lycaon escaped when the Hunters of Artemis stopped him.
King Midas - King Midas was a king who had the Golden Touch.
He was referenced in "The Battle of the Labyrinth" where he states that Rachel's gold appearance made her look like she was touched by King Midas.
In "The Lost Hero" King Midas was among the dead people brought back to life when the Doors of Death opened in Omaha, Nebraska.
When Jason, Piper, and Leo arrived at Midas' mansion, he was polite.
Midas told them that it was a silly story that he learned his lesson when he touched his daughter, turning her into solid gold.
Midas touched Piper's backpack, turning it into flexible gold and making it magic, proving he still had the magic touch.
Midas admitted that he had sometimes pat his son Lityerses on the pack accidentally, but he always had the lake to rinse it off.
Midas finally revealed he was working for the Giants and turned Leo and Piper into gold.
He gave Jason a choice: turn into a nice gold statue for his collection or fight Lityerses and die.
Jason fought Lityerses and Midas.
Midas and his son fought off the Hunters of Artemis before Jason managed to defeat Lityerses and unfreeze Piper and Leo.
King Minos - King Minos is a former king who is one of the Judges of the Underworld.
Nico summons in book four where he pretends to advise him on how to bring Bianca back from the dead he is when really trying to bring himself back.
Near the end of the book, it is revealed that he is serving his own dark purpose when he kidnaps Nico and tries to kill Deadalus and use his knowledge.
When Daedalus ends up in the Underworld following his sacrifice, King Minos tried to convince the other two judges to punish him and fails.
King Sisyphus - A former ruler of Corinth.
He had committed violations of guest hospitality, seduced his niece, plotted to kill his brother Salmoneus, and told the River God Asopus where Zeus had his daughter.
His major crimes involved cheating death twice.
The first where he tricked Thanatos into showing him how the chains worked causing Thanatos to be trapped until Ares freed him (Thanatos being trapped displeased Ares since no one in battle could die).
The second time was when he complained to Persephone that his wife Merope did not give him a proper funeral and sent Sisyphus' spirit to the living.
Even when Sisyphus did not want to return to the Underworld, he was forcefully dragged back there by Hermes.
His punishment in The Fields of Punishment was to roll a boulder up a hill, and whenever he failed he would be tempted to try again.
He appears in The Demigod Files in the story titled The Sword of Hades when Percy and Nico ask him advice while Thalia rolls the boulder up the hill.
He does not really help them much, but he does say that he helped someone else.
Therefore, Percy and his friends go to see Melinoe as Sisyphus begs for them to set him free from his punishment as being here was a minor set-back.
King Tantalus - Tantalus is a king from the Fields of Punishment who is the son of Zeus.
He ended up there after killing his son Pelops, cutting him up, and serving him as food to the Gods.
His punishment in the Fields of Punishment was to stand under a fruit tree in the middle of a lake where the branches and water would go out of reach from him.
He becomes the activities director at Camp Half-Blood after Chiron is fired.
Even when hired as the activities director, he could not eat or drink as the food kept evading him.
He is shown to hate Percy and his friends even more than he hates most half-bloods, yet shows favoritism to Clarisse such as naming her hero when the camp was attacked by Colchis Bulls or when she wins the chariot race.
He throws a banquet in her honor.
When the camp is attacked by a large flock of Stymphalian birds, Tantalus blames it on Percy, Annabeth, and Tyson's "bad chariot driving" despite that they were the ones who defeated the birds.
When Tyson is brought to camp, Tantalus insults and makes fun of him even when Tyson is claimed by Poseidon.
When at the end of the book, his curse is lifted by Dionysus just before he is sent back to the Underworld as he attempts to take some food along.
Though none of the campers were sad to see him go.
Lityerses - Lityerses is the son of King Midas.
In "The Lost Hero," he appeared alongside his father.
Medea - A sorceress and granddaughter of Helios that Jason, Piper, and Leo encountered in "The Lost Hero."
She is shown as the head of a mall in Chicago that Jason, Piper, and Leo visit.
She begins to show the demigods her stock of magic objects and potions, but becomes angry when she hears Jason's name (as he is named after the hero that betrayed her).
It quickly becomes evident to Piper that Medea is an agent of Gaia, and the one who Hera had warned them about.
Jason and Leo however are entranced by the magic in Medea's voice who tells them to attack and kill one another.
Piper managed to bring the two to their senses and they blew up the mall.
Medea shouts that she will not be abandoned again causing the three to quickly leave before she makes another attempt to destroy them.
Oracle of Delphi - Apollo's Oracle of Delphi used to reside in the mummified remains of its host until its power was transferred to Rachel Elizabeth Dare in The Last Olympian.
The Oracle's power originally passed from the deceased oracle to a newly chosen oracle; however, at the end of the second world war, the oracle gave a Great Prophecy predicting a child of the Big Three (Zeus, Poseidon, and Hades) would determine whether or not the gods would be preserved or destroyed.
Before this, Hades bore two young children, Nico di Angelo and Bianca di Angelo.
In revenge, Hades cursed the Oracle to ensure that the power of the Oracle of Delphi would not pass on to somebody else in hopes that it would soon return to the dust along with its  prison.
In response to his newfound respect from the other gods, he lifts the curse, allowing the Oracle's power to pass on into Rachel Elizabeth Dare, the last Oracle.
Procrustes - He is depicted as "Crusty," the owner of a Los Angeles mattress store who appears in The Lightning Thief.
He trapped Annabeth and Grover on his bed, but he was defeated by Percy.
Theseus - When Nico was trying to summon  Bianca in "The Battle of the Labyrinth," he ended up summoning the spirit of Theseus.
Creatures and Monsters
Antaeus - A half-giant who is the son of Poseidon and Gaia.
He remained strong while he was on the ground.
Percy managed to find a way to get him into the air and defeat him.
Argus - Argus is a multi-eyed humanoid who works as a security guard at Camp Half-Blood.
He is said to have an eye on this tongue which is why Argus does not talk much.
Automaton - Automatons are like robots, but more highly developed.
They have an intricate circuitry in them which makes them hard to fix.
Most are made out of normal steel but some like the Bronze dragon are made out of celestial bronze.
According to Annabeth, some Automatons in Manhattan were used to either attack or help defend Mount Olympus.
Bear Twins - Agrius and Oreius are humanoid bears that were a result of a union between a woman and a bear due to the power of Aphrodite.
The two served as Luke's henchmen in The Sea of Monsters.
Bronze Dragon - A dragon made of bronze that created by the campers in Hephaestus' cabin to help defend Camp Half-Blood.
He is later named "Festus" by Leo Valdez.
He is also shown in The Bronze Dragon of The Demigod Files.
Festus means Happy in Latin.
Centaur - Half man, half horse.
Chiron is a centaur.
Party Ponies - They are Chiron's kin.
As their name suggests, they are a vast clan-like extended family of rowdy centaurs who reside in the United States with chapters hailing from each respective state.
In The Last Olympian, they help Chiron and the others fight the major battle between the gods and the Titans.
Cerberus - The three-headed dog who guards the Underworld entrance to the living.
He also appears in The Last Olympian when he is playing with Mrs. O'Leary.
Charybdis - One of the two monsters (the other being Scylla) that live on either side of a narrow channel of water.
Chimera - A three-headed beast that is part lion, part goat, and has a snake-headed tail.
It disappeared after Percy dove into the water.
Clazmonian Sow - A flying pig that appeared directly after Hyperion was defeated.
Percy defeats it with the help of Blackjack, a statue of Hermes, and the New York Public Library's two stone lion statues.
Colchis Bull - An elephant-sized, fire-breathing bronze bull created by Hephaestus.
Their horns are silver and their eyes are rubies.
In The Sea of Monsters, a bunch of them attacked Camp Half-Blood and are defeated by Tyson.
They were later used to make the tracks for the Chariot Race.
Cyclops - One eyed-giants who have three species as mentioned in The Lost Hero.
The first are the elder cyclops, who are friendly, and help the gods, Tyson is one of them.
The second is the southern species, who raise Goats and live in caves.
Polyphemus is one of them.
The third, introduced in The Lost Hero, is the northern group, who helped the Titans make weapons.
Ma Gasket - A female cyclops who is the mother of Sump and Torque.
She appears in "The Lost Hero" when Jason, Piper, and Leo visit her factory in Detroit.
Polyphemus - Percy Jackson and his friends encounter him on an island in "The Sea of Monsters."
He is shown to be blind and there was also a reference about Odysseus being responsible for blinding him under the alias of "Nobody."
Sump - The son of Ma Gasket who appears in "The Lost Hero".
Torque - The son of Ma Gasket who appears in "The Lost Hero."
Draco Aionius - A bunch of these monsters attacked Camp Half-Blood while Percy Jackson was at the Sea of Monsters.
Drakon - A race of giant, millennium-old, serpent-like dragons.
Lydian Drakon - The oldest and most fiercest of the Drakons.
Kronos unleashed it upon Manhattan where it killed many half-bloods before being killed by Clarisse La Rue.
Aitheopian Drakon - One was being raised by Luke in The Sea of Monsters.
When one of the Bear Twins seemed stubborn on doing a job, Luke threatened him to been fed to the Drakon.
Echidna - Part woman, part snake.
She is the wife of Typhon and the mother of Cerberus, Chimera, Hydra, Nemean Lion, and Ladon as well as several others not in the series.
She and Chimera disappeared after Percy dove into the water.
Empousai - Seductive shape-shifting women who are similar in appearance to vampires with both shaggy donkey legs and bronze legs.
Two Empusa named Tammi and Kelli, pose as cheerleaders in The Battle of the Labyrinth.
Erymanthian Boar - A giant boar sent by Pan.
Percy, Thalia, Zoë, Grover and Bianca first encounter it in Cloudcroft, New Mexico.
Grover is the first to identify it and its potential utility to the team as a form of transportation.
Feather-Shooting Bird - A type of large black bird that shoots it's feathers like arrows.
In "The Demigod Files," Phobos summons them to fight Clarisse after he steals Ares' war chariot.
Fire-Breathing Horse - A fire-breathing horse that is sold at the Triple G Ranch for war purposes.
Some are shown to pull Ares' war chariot.
Flesh-Eating Horse - A bunch of them are seen at the Triple G Ranch.
Some of them tried to eat Percy while he was cleaning the stables.
Flesh-Eating Sheep - A bunch of carnivorous sheep that are owned by Polyphemus.
They help to guard the Golden Fleece.
They are as big as a hippopotamus and attack like piranhas.
The Furies - The Furies are Hades' chief servants and torturers—therefore, they personally searched for Hades's Helm of Darkness, thinking that Percy had stolen it.
Alecto - Alecto acted as Percy's pre-algebra teacher Mrs. Dodds in the first book.
She is also the lawer that rescued Nico and Bianca Di Angelo from the lotus hotel (mentioned in the last book).
Megaera - A Fury that represents grudging.
Tisiphone - A Fury that represents avenged murder.
Gegeines - A race of six-armed giants in leather loincloths that appear in The Lost Hero.
They are summoned by Enceladus to fight Jason, Piper, and Leo.
Geryon - In this series, Geryon is described as having a normal head where his face was weathered and brown from years in the sun, slick black hair, a pencil-thin moustache, two very beefy legs wearing a very large pair of Levis and each of his chests wore a different colored shirt: green, yellow and red.
In "The Battle of the Labyrinth," he is the owner of Triple G Ranch with Orthrus guarding the ranch.
He gave Percy an impossible task.
To clean out the stables of carnivorous horses (one of the tasks Hercules also did).
Once Jackson completed the task, Geryon went back on his deal to let his friends free and the two fought.
Jackson found Geryon a worthy battle as he was a challenge due to his three hearts which allowed him to be almost impossible to defeat.
Jackson defeated Geryon with a well placed arrow (thanks to Hera) that went through Geryon's sides hitting all three hearts at once killing Geryon.
Ghoul - The Ghouls serve as security guards in the Underworld and make a sound that is similar to bats.
They would escort the souls of the wicked to the Fields of Punishment as seen in "The Lightning Thief" when they fly a preacher that had been scamming people there.
Giant Badger - A giant badger.
In "The Last Olympian," it was mentioned that Gleeson Hedge tried to fend off the Giant Badgers and tried to summon Pan to help him in that.
Giant Crab - A giant crab that might be Cancer.
Percy fought it in the Princess Andromeda during his mission with Charlie.
He defeated it by stabbing the soft tissue in its belly.
Giant Scorpion - A giant-sized scorpion.
Native to desert regions, the giant scorpion may be a descendant of the Brontoscorpio, a species of prehistoric aquatic scorpions from Paleozoic times.
Daedalus in the alias of Quintus ordered some Giant Scorpions from Triple G Ranch.
He kept them in their boxes in the Sword Fighting Arena.
He eventually let them out in the camp's forest for a game.
Giant Squid - A giant squid that might be the Kraken.
It was among the sea monsters in Oceanus' army.
Gorgon - A Gorgon is a female humanoid creature with snake-like hair.
Anyone who looks at the face of the Gorgon turns to stone.
Medusa - The Gorgon who is the sister of Stheno and Euryale.
Under the moniker of "Aunty Em," she attempted to lure Percy, Annabeth, and Grover into a false sense of security and turn them into stone statues.
Stheno - A Gorgon who is the sister of Medusa and Euryale.
In "The Lost Hero," she was mentioned to be among the characters who were brought back to life when the Doors of Death opened.
Stheno is described by Percy as appearing as a dumpy old grandmother but with rooster feet and bronze boar tusk sticking out of the corners of her mouth.
Euryale - A Gorgon who is the sister of Medusa and Stheno.
Harpy - Aello ("storm swift"), Celaeno ("the dark") – also known as Podarge ("fleet-foot") – and Ocypete ("the swift wing") are the three harpies were created by Zeus.
They work in Camp Half-Blood as "the cleaning harpies" being allowed to eat any camper who stays in camp past noon in the last day of the summer.
The Harpies also cleaned the dishes with super-hot lava and are also good in mid-town traffic.
Hekatonkheires - Hundred-Handed Ones; giants of incredible strength, superior even to the Cyclopes.
The last one, Briares, was imprisoned by Kampê in the fourth book.
There was also mentionings that his brothers Cottus and Gyges have faded due to people forgetting about them.
Briares - He first appears in The Battle of the Labyrinth when Percy, Annabeth, Tyson, and Grover rescue him from Alcatraz, where he is being held prisoner by Kampê.
Because of this, he runs away from Percy and his companions in the maze-like Labyrinth.
Briares seizes the chance to bury Kampê under a pile of rocks.
Hellhounds - Hellhounds are a main part of Luke's army and monsters in general.
They were also mentioned to reside in the Fields of Punishment.
Daedalus owns a hound named Mrs. O'Leary, who, unlike her relatives, is loving and loyal.
Mrs. O'Leary - Mrs. O'Leary is the only friendly hellhound to ever exist.
She rescues Percy while in the Labyrinth.
Hippalectryons – The Hippalektryons are an endangered animal that is part chicken, part horse.
In "Battle of the Labyrinth," they are seen at the Triple G Ranch.
Hippocampus – Hippocampi are from waist up stallion horses and from waist down have a fish tail.
One is said to take a liking to Tyson, and soon enough he named it Rainbow.
They are also called "fish ponies" by Tyson.
Rainbow - A Hippocamus who befriends Tyson in "The Sea of Monsters.
Loves to give Tyson rides all over the sea."
Hyperboreans - Ice giants who freeze into ice when defeated.
Hydra - A monster with nine heads.
This monster appears in The Sea of Monsters where its life force is linked to the Monster Doughnut Shop as another one pops up every time the Hydra regrows a head.
In The Lightning Thief film, the creature takes the form of five janitors in the Parthenon replica in Tennessee and refers himself as "We" and is ultimately defeated by the use of Medusa's head.
Kampê - A snake-haired, centauroid creature that is half-woman, half dragon with wings and the heads of various mutated wild animals growing from her human torso.
Keres - A bunch of battlefield spirits of famine and disease that feed on violent deaths.
They reside in the Underworld and support the Titans but do not assist them in "The Last Olympian."
In "The Demigod Files," a bunch of them attacked Percy, Thalia, and Nico where one of them poisoned Percy.
Lucky for him, Bob the Titan managed to heal him.
Laistrygonians - Large, muscular cannibals who serve as the brawn of Kronos's army.
Known Laistrygonians in the series are Joe Bob, Marrow Sucker, and Skull Eater
Ladon - The giant dragon who is one of the offspring of Echidna.
Ladon poisons Zoë Nightshade in The Titan's Curse.
Lotus-Eaters - A bunch of them run the Lotus Hotel and Casino in The Lightning Thief.
Manticore - These monsters have human faces and the bodies of lions as well as thorny tails.
Dr. Thorn - He is a manticore in the form of the vice principal of Westover Hall, the school that Bianca and Nico di Angelo attended.
Minotaur - The Minotaur is part-man, part bull.
The monster of the labyrinth that chased Percy all the way to Camp Half-Blood.
The Minotaur returns in The Last Olympian as a general for Kronos's army at Williamsburg Bridge and now wearing armor.
It was defeated by Percy again.
In the film adaption, the Minotaur's head resembles a Cape Buffalo's head.
Myrmekes - A race of giant ant-like creatures that like shiny things like gold.
In "The Demigod Files," A bunch of Myrmekes trapped Charles Beckendorf in their nest.
Nemean Lion - A lion that is one of the children of Echidna and Typhon.
It battled with Percy Jackson, but was hard to defeat because of its bulletproof and sword-proof pelt.
Percy eventually defeated it by throwing astronaut food into its mouth to expose its one unprotected surface, its mouth.
Ophiotaurus - A half-cow/half-snake monster.
Bessie - Bessie is the Ophiotaurus that Percy meets in "The Titan's Curse."
Percy named it because of its bovine appearance, but it was in fact a male.
Bessie was supposedly the creature that Artemis was hunting because it could destroy Olympus.
She also briefly appeared in "The Last Olympian" where Percy sees him an aquarium.
Orthrus - A two-headed dog owned by Geryon.
Pegasus - Pegasi are winged horses.
Blackjack - He is the pure black version of Pegasus and Percy's loyal friend.
Guido - A Pegasus who is friends with Blackjack.
In "The Last Olympian," Guido and Porkpie aided Percy and Blackjack in the Battle of Manhattan.
Porkpie - A Pegasus who is friends with Blackjack.
Peleus - A dragon that guards the tree that Thalia was previously within.
Pit Scorpion - A deadly type of scorpion that appears in "The Lightning Thief."
When Luke brings Percy into the woods and reveals his allegiance to Kronos, he summoned a Pit Scorpion to attack Percy.
He tells Percy he should not go for his sword, as the pit scorpion can kill in 60 seconds, and can jump up to fifteen feet.
When Luke disappears, Percy manages to kill it even though it managed to sting him.
With the help of the wood nymphs, Percy recovered from its poison.
Satyr - Half man, half goat.
Grover Underwood is also a satyr.
Coach Gleeson Hedge - He is a satyr.
Grover made a reference to him in "The Last Olympian" where he tried to summon Pan's spirit to help fend off some badgers.
He played a part in the "Heroes of Olympus" series.
Ferdinand - Ferdinand is Grover's uncle who was one of the victims of Medusa in the Garden Gnome Emporium.
When Kronos' army was hiding out there in "The Last Olympian," his statue form is now missing an arm and has graffiti on it without Medusa watching over it.
Leneus - Leneus is a satyr who is a member of the Council of Cloven Elders.
Maron - Maron is a satyr who is member of the Council of Cloven Elders.
He only appears in book four, when he, Silenus and Leneus try to exile Grover because they think that Pan, the god of the wild, is still alive and Grover is a just lying about his death.
Silenus - Silenus is a satyr appearing in books four and five.
that he has suspicions that he is a spy.
Scylla - One of the two monsters (the other being Charybdis) that live on either side of a narrow channel of water in The Sea of Monsters.
Should a ship sail too close to her, she uses her six heads to pluck off crew members upon deck and devour them.
According to Clarisse (daughter of Ares), if the crew hid below deck, Scylla would just pick up the whole boat and crush it.
Scythian Dracaenae - A race of humanoid femals with twin snake tails in place of legs.
They make up a considerable portion of the Titan Lord's forces.
Queen Sess - The Queen of the Scythian Dracaenae who appears in "The Last Olympian."
She fought Chiron alongside Kronos and was killed when Chiron fired one of his arrows in between Queen Sess' eyes.
Sea Serpent - One was seen amongst the sea monsters in Oceanus' army.
Deimos is seen riding one in "The Stolen Chariot."
Sirens - Dangerous bird-women whose sweet songs have led many sailors to watery deaths.
Skeleton - Skeletons were used by various people like Hades.
In "The Lightning Thief," Hades had skeletons in army uniforms guarding his palace.
In "The Battle of the Labyrinth," Nico manages to employ them as part of a ritual that will enable him to call the spirit of his sister to speak with her.
In "The Last Olympian," Nico and Hades manages to bring a bunch of Skeletons to help fight the Titans.
They are later seen constructing a cabin at Camp Half-Blood that is dedicated to Hades.
Skeleton Warriors - A bunch of skeletons armed with weapons.
In "The Titan's Curse," some skeleton warriors ambushed Percy, Thalia, Zoe, Grover, and Bianca in New Mexico.
Due to her being a child of Hades, Bianca managed to destroy them.
Sphinx - A Sphinx is a monster with the head of a woman and the body of a lion.
Percy Jackson and his friends encountered the Sphinx while navigating the labyrinth.
Rather than tell riddles, the Sphinx asked historical questions.
Stymphalian Birds - A flock of birds once attacked Camp Half-Blood in The Sea of Monsters.
Percy and Annabeth used Chiron's music so Apollo's cabin could shoot them down.