Disclaimer: I am not Rick Riordan or George Lucas.
Here are the characters in this story:
Percy "Seaweed Brain" Jackson - Luke "Farmboy" Skywalker (age 14), Jedi demigod
Annabeth Chase - Mara Jade (age 14), prisoner
Thalia Grace - Jaina Solo (age 19), Jedi demigod
Poseidon - Vader (immortal), King of Kamino
Luke Castellan - Jacen (Solo) Caedus (age 21), Sith minion and captain of the Anakin Solo
Bianca di Angelo - Ahsoka (Tano) Durron (age 12), Witch of Dathomir
Nico di Angelo - Kyp Durron (age 10), Jedi demigod
Clarisse La Rue - Saba Sebatyne (age 15), Jedi demigod
Zoë Nightshade - Akanah Norand Goss (immortal), Witch of Dathomir
Hades - Bogan (immortal), King of the Netherworld
Zeus - Sekot (immortal), King of Tython
Kronos - Palpatine (immortal), Sith Emperor
Ares - Yun-Yammka (immortal), god of war
Grover Underwood - Corran Horn (age 30), Corellian searcher
Hermes - Yun-Shuno (immortal), goddess of thieves
Demeter - Anima (immortal), goddess of fertility
Dionysus "Mr. D" - Qel-Droma "Master Q" (immortal), director of the Jedi Praxeum
Tyson - Lowbacca (age 13), Wookiee
Chiron - Yoda (immortal), Jedi instructor
Silena Beauregard - Seha Dorvald (age 17), Jedi demigod
Sally Jackson - Shmi Skywalker (age 42), mother of Luke Skywalker
Oracle of Delphi - Prophet of Yavin (immortal), Jedi Seer
Rachel Dare - Gaeriel Captison (age 14), clairvoyant
Charles Beckondorf - Ganner Rhysode (age 17), Jedi demigod
Atlas "The General" - Dooku "The Count" (immortal), Sith Lord
Paul Blofis - Ben Kenobi (age 42), teacher
Travis Stoll - Chak Fel (age 14), Jedi demigod
Connor Stoll - Davin Fel (age 15), Jedi demigod
Frederick Chase - (Talon) Karrde Jade (age 47), father of Mara Jade
Ophiotaurus - Ikrit (immortal), bane of Tython
Argus - Jurokk (immortal), Jedi sentry
Blackjack - R2-D2 (age unknown), aiwha
Manticore "Dr. Thorn" - Voxyn "Dr. Vong" (immortal), Sith minion
Ariadne - Nomi Sunrider (immortal), goddess of labyrinths
Nemean lion - Corellian sand panther (immortal), monster
Ladon - Terentatek (immortal), guardian of Korriban
Phoebe - Kirana Ti (immortal), Witch of Dathomir (mention only)
Mrs. Chase - Jade (age 47), stepmother of Mara Jade
Talos - Durge (age unknown), malfunctioning cyborg
Peleus - Rancor (immortal), guardian of the Healing Crystals of Fire
Erymanthian boar - Endorian borra (immortal), gift from Yu'shaa
Matthew Chase - Ben (Skywalker) Jade (age 9), brother of Mara Jade
Robert Chase - Allana (Solo) Jade (age 9), sister of Mara Jade
Hera - Shira (immortal), Queen of Tython
Athena - Ashla (immortal), goddess of wisdom and war
Apollo - Yavin (immortal), god of prophecy
Artemis - Dathomir (immortal), goddess of the hunt
Hephaestus - Yun-Ne'Shel (immortal), god of fire
Aphrodite - Yun-Q'aah (immortal), goddess of love
Hercules - (Anakin) Skywalker (immortal), god of heroes
Nereus - Jorj Car'das (immortal), sea god
Jason - Valin Horn (age 14), Jedi demigod
Porkpie - Arnie (age unknown), aiwha
Guido - Sneaky (age unknown), aiwha
Gotschalk - Tamith Kai (age 50), teacher
Hank - PROXY (age unknown), droid
Chuck - I-5YQ "I-Five" (age unknown), droid
Theseus - Andur Sunrider (deceased), Jedi demigod (mention only)
Jason - Jacen (deceased), Republic hero (mention only)
Medea - Alema Rar (deceased), witch (mention only)
Lotus Eaters - Mind Walkers (immortal), legendary antagonists (mention only)
Helios - Satal Keto (deceased), stellar god (mention only)
Selene - Magda Keto (deceased), lunar goddess (mention only)
Locations:
Camp Half-Blood - Jedi Praxeum (Big House - Jedi Temple)
The Underworld - The Netherworld of the Force (mention only)
Olympus - Tython (Hall of the Gods - Je'daii High Council Chamber)
New York - Coruscant (Long Island - Centax)
Westover Hall - Shadow Academy
Princess Andromeda - Anakin Solo
Othrys - Korriban
Manhattan - Galactic City
California - Outer Rim (San Francisco - Braxant)
Washington D.C. - New Republic City
New Mexico - Eriadu
Junkyard of the Gods - Raxus Prime
Hoover Dam - Bakur Complex
Species:
Human - Human (Mortal - Mundane)
Satyr - Corellian
Olympian - Je'daii
Titan - Sith
Centaur - Chironian
Cyclops - Wookiee
Dracanae - Killik
Pegasus - Aiwha
Hippocampus - Varactyl
Laestrygonian - Gundark
Harpy - Omwati
Siren - Diathim
Nereid - Kaminoan
Naiad - Melodie
Hesperid - Mistryl Shadow Guard
Hunters of Artemis - Witches of Dathomir
Spartus - Zombie
Automaton - Droid