In the trilogy, "The Secret Circle," there have been several references made to the belief that either L.J.Smith used the Gods and Goddesses mental attributes when making her characters and/or maybe the characters were once the Goddesses/Gods themselves. This is exceptionally true for the girls of the circle. For instance:
Diana is Diana, Queen of the Witches (a.k.a.-Aradia for those of you who are Wiccan)
Faye is Hera
Cassie is a Calliope and/or all of the Muses of the Arts Combined...She is also mentioned to being the mortal Cassandra of Troy
Susan is Aphrodite/Venus
Deborah is Diana(roman)/Artemis
Laurel is Persephone
Melanie is Athena
The Introduction to the Idea
In "The Initiation" and also at least once in another part of the trilogy, Cassie goes into Diana's room and looks at the Greek Prints that hang there...pictures that always remind her of the other girls in the club. This is where the idea began. Some of the characters have been warped slightly from their original Goddess look a like but then again, nobody's perfect...not even the Grecian Immortals. ^_^