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I am sorry I won't be able to see you die.

–Kymopoleia to Percy Jackson in The Blood of Olympus.

Kymopoleia is the Greek goddess of violent sea and storms.

Percy Jackson's Greek Gods

Kymopoleia was born to Poseidon and Amphitrite. Unlike her siblings, she wasn't very loved by her parents, who found her presence disruptive. As a result, she eventually wandered her father's abandoned domains alone.

Kymopoleia was reluctantly married off to the Hekatonkheire Briares as a reward for him supporting the gods in the Titanomachy against Kronos. She hates her husband and his return after The Battle of the Labyrinth brings her displeasure.

The Heroes of Olympus

The Blood of Olympus

Percy Jackson, her half-brother

On their way to Delos, the Argo II is attacked by a sudden, violent storm. Percy Jackson dives into the water, followed by Jason Grace, who protects himself with a vacuum of air via venti (Dylan). They follow a green light to an old ruined domain of Poseidon, where Kymopoleia is using her powers to try and sink the ship, and lure Percy to Polybotes, who lies waiting.

While Percy is slowly suffocated by Polybotes' poison, Jason convinces Kymopoleia to help them, by promising to build both a Roman and Greek shrine, a custom banner, her own super frightening cabin at Camp Half-Blood, and an action figure. The idea of being feared and respected is enough to motivate her to slice off Polybotes' head.

Before Jason and Percy leave, she warns them that Percy's fatal flaw may cost them the world. She also confirms that Jason's plan to defeat Gaea could succeed. She conveys Dylan's wish to be released upon returning to the surface, which a disgusted Jason agrees to.

After the defeat of the giants, Jason tells Zeus about his vow to Kymopoleia. Zeus agrees that his plan is fine, but is confused as to who the goddess is until Poseidon reveals that she's one of his children.

The Trials of Apollo

The Burning Maze

In Edgarton Day and Boarding School, Jason Grace is making sketches and a layout of shrines for minors gods to keep his promise for Kymopoleia. Unfortunately, he was killed by Caligula before his work could be finished, he received a Herophile saying this would happen. So Apollo and Meg McCaffrey take the sketchbook and layout to Camp Jupiter to finish off the work Jason started.

Magnus Chase and the Gods of Asgard

The Ship of the Dead

Kym is mentioned by Percy Jackson when he mentions how Jason Grace convinced her to save him with action figures and banners. Annabeth Chase mentions that she never heard the details of that, which causes Percy to blush.


Overall, Kymopoleia is driven by her desire to be feared. She states that her father is constantly restricting her chaotic powers, much to her chagrin. She has grown bitter after being cast out by her family and given over to Briares like an object. After Jason promises that she will gain recognition, she softens up a bit and even tells Jason that she finds him funny.


Kymopoleia is described as a 20-foot-tall goddess. She has skin as white and luminous as algae fields and hair that glowed like jellyfish tendrils. Jason observed that her face was beautiful but unearthly, with too-bright eyes and too-delicate features. She laughs like a dolphin and has a melodic voice, the resonance of which seemed to extend past the range of human hearing.

Kymopoleia wears a flowing green dress that was cinched at the waist with a belt of abalone shells. Her too-cold smile implied that she hadn't perfected the art of smiling.


As the immortal daughter of Poseidon, Kymopoleia is a considerably powerful goddess. However, she isn't quite as powerful as an Olympian.

  • Hydrokinesis: As the Goddess of Violent Sea, Kymopoleia has divine authority and absolute control over water, violent waters of the sea, and sea storms, to a far greater degree than her demigod siblings - such as Percy - but to a lesser degree than her father.
    • Toxikinesis: After killing Polybotes, Kymopoleia dissipated the poison killing Percy with a mere gesture.
    • Water Immunity: Her body allows her to survive the freezing cold temperatures at the bottom of the ocean.
  • Atmokinesis: As the Goddess of Violent Sea Storms, Kymopoleia can conjure storms over the seas, such as hurricanes and typhoons. In The Blood of Olympus, she mentioned that the violent storm that was sinking the Argo II was a "small taste" of what she could do.
    • Aerokinesis (limited): As a byproduct of generating sea storms, Kymopoleia can manipulate the air. In The Blood of Olympus, the wind roared so loudly that the Seven could barely hear each other.
      • Storm Spirit Communication: As the goddess of sea storms, Kymopoleia has dominion over Storm Spirits and can communicate with them. This is shown when she told Jason that Dylan was begging for release.
  • Immense Godly Strength: Kymopoleia has great strength, even for a goddess. She decapitated Polybotes (one of the most powerful of the Giants) by simply hurling a bronze disk.
  • Immense Godly Durability: Kymopoleia has immense durability. She barely flinched when smacked in the ribcage by Polybotes' Trident.


  • Kymopoleia is the only female and goddess to call Percy Jackson her brother.
    • She is his second sibling to call him by his full name along with Triton.
  • She and Triton were both introduced in the last book of their respective series (Percy Jackson Series) and (The Heroes of Olympus Series).
  • Interestingly, Kymopoleia is the only character in either series that is compared to a superhero from Marvel Comics (Captain America). Jason and Percy, on the other hand, are compared to superheroes from DC Comics (Superman and Aquaman respectively).
  • In mythology, Kymopoleia and Briares have a daughter named Oeolyca , who was the goddess of storm generated wave surges.
The Heroes of Olympus
Core Series: The Lost Hero | The Son of Neptune | The Mark of Athena | The House of Hades | The Blood of Olympus
Main Characters: Jason Grace | Piper McLean | Leo Valdez | Percy Jackson | Frank Zhang | Hazel Levesque | Annabeth Chase | Reyna Ramírez-Arellano | Nico di Angelo | Gleeson Hedge
Secondary Characters: Hylla Ramírez-Arellano | Dakota | Tyson | Ella | Octavian | Halcyon Green | Dr. Howard Claymore | Alabaster C. Torrington | Lamia | Iapetus/Bob
Minor Characters: Rachel Elizabeth Dare | Grover Underwood | Thalia Grace | Fleecy | Mrs. O'Leary | Kinzie | Arion | Calypso | Lou Ellen Blackstone | Chiron | Will Solace | Tristan McLean | Don | Julia | Jacob | Michael Varus | Burly Black | Medea | Midas | Lityerses | Phineas | Otrera | Echo | Narcissus | Sciron | Pasiphaë
Olympian Gods: Zeus | Hera | Poseidon | Hades | Ares | Demeter | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus
Minor Gods: Achelous | Aeolus | Asclepius | Boreas | Eurus | Hecate | Iris | Hypnos | Keto | Khione | Kymopoleia | Mithras | Nemesis | Nike | Notus | Phorcys | Serapis | Thanatos | Triptolemus | Zephyros
Roman Gods: Jupiter | Juno | Neptune | Pluto | Mars | Minerva | Ceres | Lupa | Bellona | Fortuna | Janus | Terminus | Vulcan | Mercury | Apollo (Roman) | Diana | Venus | Bacchus | Pomona | Aquilon | Hercules | Cupid | Auster | Favonius | Letus | Victoria
Giants: Enceladus | Porphyrion | Alcyoneus | Polybotes | Ephialtes | Otis | Damasen | Clytius | Mimas | Orion | Hippolytos | Thoon | Periboia
Undead: Gray | Zombie
Primordial Gods: Gaea | Tartarus | Ourae | Nyx | Chaos | Ouranos | Akhlys | Hemera | Elpis | Spes
Monsters and Magical Creatures: Cynocephali | Gorgon | Gryphon | Harpy | Basilisk | Lycanthrope | Gegeines | Cyclops | Katobleps | Unicorn | Giant Eagle | Ichthyocentaur | Satyr/Faun | Storm Spirit | Laistrygonian Giant | Lares
Related Content: Rick Riordan | Haley Riordan | Percy Jackson and the Olympians | Percy Jackson and the Olympians: The Ultimate Guide | The Demigod Files | The Demigod Diaries | The Son of Sobek | The Singer of Apollo | The Staff of Serapis | Percy Jackson's Greek Gods | Percy Jackson's Greek Heroes | The Crown of Ptolemy | Demigods & Magicians | Demigods of Olympus | Percy Jackson Demigod Collection