One of Notte’s currently living nine “first-born” children – that is, a vampire he made himself. She was made approximately 500 AD.
He’s one of the oldest living beings among the Mythos. The... More chose her because of her skill with the harp. Not unlike A Night-Child with an unusual skill for dancing.A Night-Chil... More (not first-born, though hand-picked by He’s one of the oldest living beings among the Mythos. The... More), Elise’s talent eclipsed ordinary musicality by such a degree that he could not let her simply age and die and be lost to the world.
Elise is a little vain, but perhaps deserves to be; she was a primary influence in Dante Gabriel Rosetti’s style.