Isis is the beautiful priestess guardian of the Millenium Necklace. Her power lies in the ability to predict what will happen in the Kingdom. Unfortunatelly, she couldn't tell what will happen to people who have abilities like hers or people possessing Millenium Elements. That's why she couldn't see the coming of Bakura.
She is Ishizu Ishtar in the present.
Translated from Bulgarian language by: Ted^Maverick (TV_Squad)