Artemis in Codename Sailor V IIRC said that Sailor Venus is supposed to be the goddess of love, which she usually calls herself as well. Other times it seems like they are a reincarnation of them, or their children (then again, being a child of Jupiter is not difficult, seventy percent of Greek people are his kids). Pluto has said a couple of times that she calls for Chronos, or the god of time in Greek mythology. They seem to exist in the SM universe, but their relationship to the Senshi is vague. Then again, I imagine a lot of women who would volunteer to be part of the cult around .