I think I have a good basic background. A grand temple to the Goddess Shelyn had existed upon the plane of Elysium for eons. It was a place of celebration for eternal love, beauty and art. One Tulani heirophant spent centuries making a statue that was supposed to represent the perfect standard of physical beauty. Though small in size the sculpture was flawless and admired by all in the temple, but none admired it as much as its creator. As a reward to the faithful Eledrin Shelyn gave the statue life, turning it into a person of flesh and blood. This Galataea in addition to being it's creators lover became almost a figurehead of the temple. Faithful came from all around to see the divinely touches beauty and pay homage to the goddess. The joy within the temple would last many years, but would not be eternal.
One of the greatest evils on Golarion, the Dragon (I actually forget his name insert it here), wanted to give a truly remarkable gift to his god. With a mass congregation of faithful and powerful black magic it transported the grand Elysian temple of Shelyn to the plane of shadow. There the beautiful temple and all within it were a gift for the vile god Zon-Kuthon to sake his lusts and sadism upon. The inhabitants, great as they were, were no match for the prime avatar of Zon-Kuthon. The god saw the beautiful being brought to life by the hand of Shelyn. He was thrilled with the opportunity to defile it, so he raped and tortured it upon the goddesses Altar. (and Ill finish it up later, but you know where this is going)
After looking around this is what I am probably going with for classes. The paladin is obviously the non casting variant.
Mystic: Sha'ir 12
Might: Monk 1/Paladin of Tyranny 3/Lifedrinker 8.
Monsterous: Psychic Vampire Lord Lesser Whispling/ Master Vampire 1
PS: When looking at potential deities I knew I wanted a deity of love and beauty to be the original, but wasn't sure about who should be the rapist. I thought of Bane, Orcus, Belial, but then I remembered Zon Kuthon. I don't think there exists a more horrifically sexual choice.