Due to that fact that Rayne was raised to be a powerful vampiric assassin that isn't supposed to show any sign of weakness to her opponents, she can seem cold, aloof, brooding, and even callous at times.
Her mother was raped by her vampire father, Kagan.
It was a search that led her to Europe, where she committed a series of murders of Vampires along the way before being apprehended.
They can only be used by Dhampirs, though it is not explained how or why, and have numerous lethal upgrades from their base Blood Shot single shot firing mode, including Blood Stream fully automatic fire , Blood Spray shotgun fletchette like shot , Blood Bomb a time-delayed explosive round , Blood Flame bursts of fiery material and Blood Hammer high-explosive.
There's a nice shot of her rump and pumps in Slave 2009 during a slow and sensual, although often too zoomed in, sex scene.
The dual handguns fuse blood with chemicals in order to make lethal projectiles.