Nightingale is obviously an angel. To more educated people she would be identifyied as an "astral deva".

The silver appearance sometimes robed, sometimes armored always looks calm and friendly. She is about 6 feet tall and slim. Her silvery long hair looks even better when the moon shines along her. The angel's face is just beautiful, high cheekbones, a cute nose, full lips and eyes that would remember on those of elves. Her eyecolour is silvery-blue and like stars her eyes do almost glow. Her slim but not at all skinny body does have feminine curves at all, a chest of DD size, fitting perfectly in whatever she wears. A flat tummy, lovely hips and long legs create a perfect butt. Along her back grow large white feathers, ofcourse those are the angelwings with a slight silvery shimmer.

Nightingale's voice is wonderful and melodic but still she can be rough and tough if its about to get rid of the darkness in the world.