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You don’t even know what’s happening, do you? Soon, your pretty little camp in flames, your friends made slaves to the Lord of Time, and there’s nothing you can do to stop it. It would be merciful to end your life now, before you have to see that.

–Kelli to Percy Jackson, in The Battle of the Labyrinth

Kelli is a skilled, senior empousa, disguised as a cheerleader, attending Goode High School.

Percy Jackson and the Olympians

The Battle of the Labyrinth

Kelli and Tammi went to Goode High School to kill Percy Jackson. Percy beat her trainee Tammi, but Kelli got away easily since she was a senior empousa. She stayed with Luke.

In Percy's dreams, Kelli always sensed that he was watching. She tries to bite him every time, causing Percy to wake up.

Grip da percy

Percy Jackson, who Kelli was sent to kill.

She then helped catch Percy, but she died in Daedalus' workshop when Annabeth stabbed her with her celestial bronze knife while trying to stop them from getting away.

The Heroes of Olympus

The House of Hades

Kelli and a group of other empousai are walking towards the Doors of Death. Kelli talks about how when they get to the mortal world she wants to personally kill Percy. Eventually, Percy and Annabeth defeat Kelli and the empousai, with the help of the former Titan Lord of the Underworld, Iapetus (now known as Bob).

She may have been among the empousai who confronted the rest of the Seven in the House of Hades, using their charmspeak to counter Piper McLean's.

Personality

While pretending to be a normal cheerleader, Kelli is an alluring valley girl, but is cruel and merciless in her true form.

Appearance

Kelli is an empousa, who are the servants of the goddess Hecate. In true form, she has completely white skin, flaming hair, fangs, one bronze leg and one donkey leg, and red eyes. When in human form she appears as a pretty African American girl with curly hair. Percy describes the hair as "curly hair like Medusa's".

Abilities

As an empousa, she can put men under her spell so she can feast on their blood.  She can also charmspeak, change shape, and manipulate the Mist, as stated by Annabeth in The House of Hades.  She can change from her human form to her true form. She is also able to sense demigods watching her in their dreams as she scared Percy out of his. 

Trivia

Percy Jackson and the Olympians
Core Series: The Lightning Thief | The Sea of Monsters | The Titan's Curse | The Battle of the Labyrinth | The Last Olympian
Main Characters: Percy Jackson | Grover Underwood | Annabeth Chase | Tyson | Clarisse La Rue | Thalia Grace | Nico di Angelo | Chiron | Luke Castellan | Rachel Elizabeth Dare
Minor Characters: Travis Stoll | Connor Stoll | Mrs. O'Leary | Silena Beauregard | Charles Beckendorf | Sally Jackson | Paul Blofis | Blackjack | Zoë Nightshade | Bianca di Angelo | Juniper | Michael Yew | Ethan Nakamura
Olympian Gods: Zeus | Hera | Poseidon | Demeter | Ares | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus | Hades | Hestia
Minor Gods: Amphitrite | Ariadne | Hecate | Iris | Janus | Morpheus | Nemesis | Pan | Persephone | Triton
Titans: Kronos | Atlas | Calypso | Iapetus | Krios | Hyperion | Oceanus | Prometheus
Related Content: Rick Riordan | The Lightning Thief (film) | The Sea of Monster (film) | The Demigod Files | Demigods and Monsters | The Ultimate Guide | The Heroes of Olympus
Monsters
Species: Centaur | Cyclopes | Dragon | Drakon | Empousai | Fire-Breathing Horse | Giants | Gorgons | Harpies | Hyperborean Giants | Ichthyocentaur | Katoblepones | Laistrygonian Giants | Lycanthrope | Merpeople | Nikai | Nymphs | Pegasus | Satyrs | Stymphalian Birds | Telekhines | Blemmyae | Basilisks | Sirens | Gemini | Scythian Dracanae | Ghoul | Hekatonkheires | Myrmekes | Unicorns | Hippalektryons | Arai | Gegeines | Karpoi | Makhai | Keres | Hippocampi | Venti | Yales
Friendly Monsters: Argus | Blackjack | Briares | Cottus | Gyges | Chiron | Don | Ella | Festus | Gleeson Hedge | Gray |Grover Underwood | Lysas | Rainbow | Mellie | Mrs. O'Leary | Ophiotaurus | Peleus | Porkpie | Guido | Scipio | Tyson | Tempest | Sssssarah | Peaches
Enemy Monsters: Agrius and Oreius | Arachne | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bulls | Echidna | Euryale | Geryon | Joe Bob | Kampê | | Nanette | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Sphinx | Lamia | Medusa | Euryale | Stheno | Typhon | Python | Kekrops | Cacus | Trojan Sea Monster | Ladon | Antaeus
Neutral Monsters: Carnivorous Sheep | Cerberus | Erymanthian Boar | Gray Sisters | Furies | Flesh-Eating Horse | Gryphon | Skolopendra | Sybaris | Orthus