Aurora

Aurora is a powerful Chaos energy wielding being who watches over Mobius but lives in another realm called the Special Zone. Originally a servant of the Ancient Walkers, her mysterious nature includes the ability to appear unto a person as they imagine her to be, no matter what their species. Only the Echidna form of this has been seen, but it can be assumed that her other forms would include similar traits. Aurora first appeared during Knuckles the Echidna's temporary death, helping him to come to grips with his time in the afterlife and to join the Chaos Force. Despite her protests, he later left it to return to Mobius to aid his friends and family. Aurora would later be named one of the Neo Walkers, successors to the Ancient Walkers, shortly before the original trio died.