Disclaimer: I am not Rick Riordan or George Lucas.
Here are the characters in this story:
Percy Jackson - Luke Skywalker (age 16), Jedi demigod
Annabeth Chase - Mara Jade (age 17), Jedi demigod
Jason Grace - Jacen Solo (age 16), Imperial demigod
Piper McLean - Danni Quee (age 15), Jedi demigod
Leo Valdez - Ben Skywalker (age 15), Jedi demigod
Hazel Levesque - Tahiri Veila (age 13), Imperial general and witch
Frank Zhang - Jagged Fel (age 16), Grand Admiral of the Imperial Remnant
Reyna Ramirez-Arellano - Tenel Ka Djo (age 16), Grand Admiral of the Imperial Remnant
Nico di Angelo - Kyp Durron (age 14), Jedi demigod
Octavian - Thrackan Sal-Solo (age 18), Diktat of the Imperial Remnant
Gleeson Hedge - Booster Terrik (age 104), Jedi recruiter
Grover Underwood - Corran Horn (age 33), Lord of the Wild
Rachel Dare - Gaeriel Captison (age 16), Jedi Prophet
Ares / Mars Ultor - Yun-Yammka / Yammosk (immortal), god of war
Will Solace - Dorsk 81 (age 16), Jedi demigod and healer
Aphrodite / Venus - Yun-Q'aah / Lwyll (immortal), goddess of love
Dakota - Wedge Antilles (age 17), Imperial demigod and general
Nemesis - Yun-Harla (immortal), goddess of revenge (mention only)
Tyson - Lowbacca (age 16), general
Gaea - Abeloth (immortal), mastermind
Porphyrion - Shimrra (immortal), Supreme Overlord of the Yuuzhan Vong
Thalia Grace - Jaina Solo (immortal), Witch of Dathomir
Calypso - Vestara Khai (immortal), witch
Hecate - Morag (immortal), goddess of magic
Ouranos / Uranus - Cosinga / Aperion (deceased), Celestial (mention only)
Clarisse La Rue - Saba Sebatyne (age 17), Jedi demigod
Orion - Nom Anor (immortal), Yuuzhan Vong
Merope - Ailyn Vel (deceased), princess (mention only)
Oenopion - Boba Fett (deceased), King of Concord Dawn (mention only)
Polybotes - Tsavong Lah (immortal), Yuuzhan Vong
Arion - Tikk (immortal), uvak
Iapetus "Bob" - Revan "Darth" (deceased), former Sith Lord (mention only)
Festus - Falcon (age unknown), mechanical dragon
Nyx - Umbara (immortal), goddess of night (mention only)
Tartarus - Yun-Yuuzhan (immortal), god of the Maw (mention only)
Nike / Victoria - Daala / Natasi (immortal), goddess of victory
Cupid - Yun-Txiin (immortal), god of love (mention only)
Akhlys - Eldon Ax (immortal), goddess of misery (mention only)
Beryl Grace - Tiion Solo (deceased), mother of Jacen and Jaina Solo
Hades / Pluto - Bogan / Vitiate (immortal), King of the Netherworld
Chiron - Yoda (immortal), director of the Jedi Praxeum
Blackjack - R2-D2 (age unknown), aiwha
Ella - Qwi Xux (age unknown), Omwati
Damasen - Vua Rapuung (deceased), Yuuzhan Vong (mention only)
Periboia - Ngaaluh (immortal), Yuuzhan Vong
Lou Ellen - Numa Rar (age 16), Jedi demigod
Thoon - Jakan (immortal), Yuuzhan Vong
Athena / Minerva - Ashla / Taselda (immortal), goddess of wisdom and war
Apollo - Yavin (immortal), god of prophecy
Artemis / Diana - Dathomir / Allya (immortal), goddess of the hunt
Phoebe - Kirana Ti (immortal), Witch of Dathomir
Kymopoleia "Kym" - Mallatobuck "Malla" (immortal), goddess of violent storms
Bryce Lawrence - Irek Ismaren (age 16), Imperial demigod
Pelops - Vilas (deceased), king (mention only)
Argentum - Chromium (age unknown), mechanical vornskr
Aurum - Aurodium (age unknown), mechanical vornskr
Deimos - Darth Nihilus (immortal), god of terror (mention only)
Phobos - Darth Phobos (immortal), god of fear (mention only)
Clytius - Harrar (immortal), Yuuzhan Vong (mention only)
Sciron - Xizor (deceased), pirate (mention only)
Pasiphaé - Aleema Keto (immortal), witch (mention only)
Asclepius - Pomojema (immortal), god of medicine
Hygieia - Cilghal (immortal), goddess of health
Michael Varus - Vilim Disra (deceased), former Grand Admiral of the Imperial Remnant
Michael Kahale - Lon Shevu (age 16), Imperial demigod
Buford - Fiver (age unknown), mechanical table
Scipio - Rancor (age unknown), aiwha (mention only)
Medusa - Garowyn (immortal), Dathomirian (mention only)
Notus / Auster - Kinetite / Mustafar (immortal), god of summer (mention only)
Kinzie - Shada D'ukal (age 26), Hapan warrior
Ephialtes - Shoon-mi Esh (immortal), Yuuzhan Vong
Otis - Kunra (immortal), Yuuzhan Vong
Passalos - Grees (immortal), thief (mention only)
Akmon - Sligh (immortal), thief (mention only)
Tristan McLean - Face Loran (age 40), actor (mention only)
Julian Ramirez-Arellano - Isolder Djo (deceased), father of Teneniel and Tenel Ka Djo (mention only)
Diocletian - Contispex (deceased), former Galactic Emperor (mention only)
Cecil Markowitz - Jaden Korr (age 17), Jedi demigod
Demeter / Ceres - Anima / Pelekotan (immortal), goddess of fertility
Bellona - Augwynne (immortal), goddess of war (mention only)
Zephyros / Favonius - Ferus Olin / Fess Ilee (immortal), god of spring and servant of Yun-Txiin (mention only)
Pegasus - Aiwha (immortal), god of the aiwha
Butch Walker - Zekk (age 16), Jedi demigod
Chuck Hedge - Mirax Terrik (newborn), daughter of Booster and Jysella Terrik
Clovis - Fi Skirata (age 15), Jedi demigod
Naomi - Sanola Ti (immortal), Witch of Dathomir
Leila - Iella Wessiri (age 16), Imperial demigod and general
Luke Castellan - Jacen (Solo) Caedus (deceased), Jedi martyr (mention only)
Lycaon - Darth Scabrous (immortal), lycanthrope
Malcolm Pace - Kyle Katarn (age 16), Jedi demigod
Antinous - Pre Vizsla (deceased), ghost
Eurymachus - Tal Merrik (deceased), ghost
Enceladus - Onimi (immortal), Yuuzhan Vong
The Fates - The Ones (immortal), deities of the Force
Hephaestus - Yun-Ne'Shel (immortal), god of fire
Dylan - Welk (amortal), Force spirit
Celyn - Allaya (immortal), Witch of Dathomir
Connor Stoll - Davin Fel (age 18), Jedi demigod
Travis Stoll - Chak Fel (age 15), Jedi demigod
Jacob - Vitor Reige (age 18), Imperial demigod
Hera / Juno - Shira / Lumiya (immortal), Queen of Tython
Poseidon / Neptune - Vader (immortal), King of Kamino
Mimas - Nas Choka (immortal), Yuuzhan Vong
"Iros" - "Villip" (deceased), beggar
Iris - Tionne (immortal), messenger goddess (mention only)
Zeus / Jupiter - Sekot / Zonama (immortal), King of Tython
Guido - Sneaky (age unknown), aiwha
Sally Jackson - Shmi Skywalker (age 45), mother of Luke Skywalker (mention only)
Zoë Nightshade - Akanah Norand Goss (deceased), Witch of Dathomir (mention only)
Seymour - Cay (age unknown), sabercat
Gaius Vitellius Reticulus - Valenthyne Farfalla (deceased), Force spirit (mention only)
Bianca di Angelo - Ahsoka (Tano) Durron (deceased), Witch of Dathomir (mention only)
Hippolytus - Yomin Carr (immortal), Yuuzhan Vong
Kekrops - Skal'nas (immortal), King of Corellia
Odysseus - Obi-Wan (deceased), King of Stewjon (mention only)
Hippias - Drikl Lecersen (deceased), tyrant
Hasdrubal - Xim (deceased), King of Tion
Manticore - Voxyn (immortal), Sith minion (mention only)
Minos - Exar Kun (deceased), king (mention only)
Penelope - Satine (deceased), Queen of Stewjon (mention only)
Boreas - Thrawn (immortal), god of winter (mention only)
Mellie - Jysella (age unknown), Melodie
Hypnos - Morichro (immortal), god of sleep (mention only)
Hermes / Mercury - Yun-Shuno / Scut (immortal), god of thieves
Orcus - Cronal (immortal), god of eternal punishment
Janus - Darth Bane (immortal), god of choices (mention only)
Briares - Chewbacca (immortal), Wookiee hero (mention only)
Circe - Talzin (immortal), witch (mention only)
Jules-Albert - Zeth Durron (deceased), chauffeur to Kyp Durron
Frederick Chase - (Talon) Karrde Jade (age 45), father of Mara Jade (mention only)
Rainbow - Boga (age unknown), varactyl (mention only)
George - Han (immortal), amphistaff (mention only)
Martha - Leia (immortal), amphistaff (mention only)
Paul Blofis - Ben Kenobi (age 44), teacher (mention only)
Katie Gardner - Tyria Sarkin (age 15), Jedi demigod
Drew Tanaka - Erisi Dlarit (age 16), Jedi demigod
Lupa - Vergere (immortal), Imperial instructor (mention only)
Banastre Tarleton - Wilhuff Tarkin (deceased), Imperial demigod
Aeolus - UnuThul (immortal), Lord of the Winds (mention only)
Phorcys - Xendor (immortal), sea god (mention only)
Keto - Arden Lyn (immortal), sea goddess (mention only)
Ma Gasket - Mezhan Kwaad (immortal), weapons manufacturer for the Yuuzhan Vong (mention only)
Miranda Gardiner - Jesmin Tainer (age 15), Jedi demigod (mention only)
Kronos / Saturn - Palpatine / Sidious (immortal), Sith Emperor (mention only)
Jake Mason - Kenth Hamner (age 16), Jedi demigod
Dionysus - Qel-Droma (immortal), god of wine (mention only)
Khione - Nen Yim (immortal), Je'daii traitor (mention only)
Hebe - Aldera (immortal), goddess of youth (mention only)
Terminus - C-3PO (immortal), guardian of Bastion (mention only)
Aphros - Gial Ackbar (immortal), Mon Calamari (mention only)
Bythos - Cha Niathal (immortal), Mon Calamari (mention only)
Narcissus - Bror Jace (deceased), prince (mention only)
Locations:
Camp Half-Blood - Jedi Praxeum (Big House - Jedi Temple)
Camp Jupiter - Imperial Remnant (mention only)
California - Outer Rim (mention only)
The Underworld - The Netherworld of the Force (mention only)
Tartarus - The Maw (mention only)
Greece - Corellia (Parthenon - Ashla)
Sparta - Mandalore
Olympus - Tython (mention only)
New York - Coruscant (Long Island - Centax)
Puerto Rico - Dathomir (San Juan - Singing Mountain)
Ithaca - Stewjon
Manhattan - Galactic City (mention only)
Rome - Old Bastion (mention only)
Ogygia - Mortis
Mykonos - Talus and Tralus
Delos - Centerpoint
Pompeii - Carida (Mount Vesuvius - Caridan)
Portugal - Yavin (Évora - Massassi)
Temple of Diana - Temple of Fire
Epidaurus - Mimban (Asclepeion - Temple of Pomojema)
Buford - Dantooine
Carthage - Tion Hegemony (mention only)
Olympia - Imperial Center
Khios - Concord Dawn
Argo II- Millennium Falcon
Species:
Human - Human (Mortal - Mundane)
Satyr - Corellian
Olympian - Je'daii
Gigantes - Yuuzhan Vong
Titan - Sith (mention only)
Cynocephalus - Yevethan
Geminus - Rakata
Lycanthrope - Shistavanen
Pegasus - Aiwha
Earthborn - Rakghoul
Harpy - Omwati
Nymph - Melodie
Anemoi - Joiner
Horse - Uvak
Automaton - Droid
Makhai - Yammosk
Mania - Wraith
Boread - Chiss (mention only)
Lar - Force spirit (mention only)
Nereid - Kaminoan
Karpoi - Ewok
Spartan - Mandalorian
Anemoi thuelae / Ventus - Pazhkic Yuuzhan'tar al'tirrna / Dhuryam
Ourae - Hutt
Kerkopes - Squib (mention only)
Eidolon - Vagaari (mention only)
Lemures - Spirit
Dracanae - Killik
Protogenoi - Celestials
Laestrygonian - Gundark
Erinyes - Nightsister (mention only)