She is the Key Of Twilight. we see her as a little girl floating upon a bed in another dimentison
She encourages Tsukasa to stay in ' The World ' telling him that it is safe and the real world has nothing but pain for him.

Nothing much is known about Auraat this piont, every time Tsukasa touches her, he recieves flash backs of negetive nature about his past, his life. some times he even sees himself with Aura holding her hand whilst running through woods.

more about her will be added