She is keeper of the time temple. She origanally has no form, but if given one she would be a female with white hair and gold eyes. She isn't considered good or evil, eventhough she is very fond of Link and Zelda. She believes that happenes for a reason and you can not live in the past.
She isn't allowed to interfere with the hero of time at all. All she can do is watch. She is also very clever, so she has done small things to help link. Small things you wouldn't notice.