Disclaimer: I am not Rick Riordan or George Lucas.
Here are the characters in this story:
Percy "Seaweed Brain" Jackson - Luke "Farmboy" Skywalker (age 12), Jedi demigod
Annabeth Chase - Mara Jade (age 12), Jedi demigod
Poseidon - Vader (immortal), King of Kamino
Luke Castellan - Jacen (Solo) Caedus (age 19), Sith minion
Clarisse La Rue - Saba Sebatyne (age 13), Jedi demigod
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 28), Jedi recruiter
Hermes - Yun-Shuno (immortal), goddess of thieves (mention only)
Demeter - Anima (immortal), goddess of fertility (mention only)
Dionysus "Mr. D" - Qel-Droma "Master Q" (immortal), director of the Jedi Praxeum
Hestia - Jabitha (immortal), goddess of the hearth
Chiron "Mr. Brunner" - Yoda "Master Jedi" (immortal), Jedi instructor
Tartarus - Yun-Yuuzhan (immortal), god of the Maw (mention only)
Sally Jackson - Shmi Skywalker (age 40), mother of Luke Skywalker
Oracle of Delphi - Prophet of Yavin (immortal), Jedi Seer
Thalia Grace - Jaina Solo (ageless), Jedi demigod (mention only)
Medusa "Aunty Em" - Garowyn "Madam Wyn" (immortal), Dathomirian
Gabe Ugliano - Cliegg Lars (age 45), stepfather of Luke Skywalker
Alecto "Mrs. Dodds" - Asajj "Madam Ventress" (immortal), Nightsister
Megaera - Gethzerion (immortal), Nightsister
Tisiphone - Talia (immortal), Nightsister
Echidna - Roganda (immortal), monster
Frederick Chase - (Talon) Karrde Jade (age 45), father of Mara Jade
The Fates - The Ones (immortal), deities of the Force
Argus - Jurokk (immortal), Jedi sentry
Pasiphaé - Aleema Keto (immortal), witch (mention only)
Minotaur - Gamorrean (immortal), monster
Cerberus - Tuk'ata (immortal), guardian of the Netherworld
Chimaera - Nexu (immortal), monster
Nancy Bobofit - Camie Loneozner (age 12), student at Carida Academy
Charon - Scourge (immortal), ferryman of the Netherworld
Procrustes - C'Baoth (immortal), giant
Ferdinand - Halcyon (deceased), former Corellian searcher
Gladiola - Whistler (age unknown), droid
Eddie - Owen (age 43), superintendent
Maurice - Niles Ferrier (age 51), animal smuggler
Eddie - Reck Desh (age 34), animal smuggler
Hera - Shira (immortal), Queen of Tython (mention only)
Athena - Ashla (immortal), goddess of wisdom and war (mention only)
Apollo - Yavin (immortal), god of prophecy (mention only)
Artemis - Dathomir (immortal), goddess of the hunt (mention only)
Hephaestus - Yun-Ne'Shel (immortal), god of fire (mention only)
Aphrodite - Yun-Q'aah (immortal), goddess of love (mention only)
Hercules - (Anakin) Skywalker (immortal), god of heroes (mention only)
Orpheus - Skirata (deceased), Jedi demigod (mention only)
Harry Houdini - Xaverri (deceased), Jedi demigod (mention only)
Lotus Eaters - Mind Walkers (immortal), legendary antagonists
Nereid - Kina Ha (immortal), Kaminoan
Ouranos - Cosinga (deceased), Celestial (mention only)
Locations:
Camp Half-Blood - Jedi Praxeum (Big House - Jedi Temple)
Tartarus - The Maw
The Underworld - The Netherworld of the Force
Fields of Punishment - Chaos
Elysium - Alderaan
Isles of Blest - Zonama Sekot
Las Vegas - Kessel (Lotus Hotel and Casino - Sinkhole Station)
Olympus - Tython (Hall of the Gods - Je'daii High Council Chamber)
New York - Coruscant (Long Island - Centax)
Yancy Academy - Carida Academy
Aunty Em's Garden Gnome Emporium - Madam Wyn's
DOA Recording Studios - Well of the Dark Side
Missouri - Corellia (St. Louis Arch - Centerpoint Station)
Montauk - Varykino
Manhattan - Galactic City
Waterland - Mon Calamari
California - Outer Rim (Los Angeles - Tatooine)
Santa Monica (Santa Monica Pier) - Rodia (Wesessa Sea)
Species:
Human - Human (Mortal - Mundane)
Satyr - Corellian
Olympian - Je'daii
Titan - Sith
Centaur - Chironian
Gorgon - Dathomirian
Erinyes - Nightsisters
Dog - Droid
Nereid - Kaminoan
Protogenoi - Celestials (mention only)