Melkor

You were a mixture of balrog and river maiden, a creation of Melkor. being the embodiment of darkness and hatred, you, even though you inherited your mother's beautiful human form, were at heart like the rest of Melkor's servants. however, even the Dragon Father himself felt that you, a beautiful maiden, could not be given the same dirty tasks, so you were given the opportunity to be his personal servant. Melkor never showed any interest in women, and in general, no one could even allow the thought of the Dark Lord stooping to carnal or platonic liaisons. You've spent your entire conscious life around him, but he's never held his gaze on you, saying you were just "for beauty's sake."
Melkor had not left the fortress of Utumno recently, staying there in his most human form yet. Now he looked like a tall, pale man with long black hair.