Oracle and Wonder Woman.... sounds like you need to go mythological for a name ;) Have you got a favorite?

ETA: DUH, you need to be Metis, the winged Titan of wisdom. Mother of Athena. Zeus felt threatned by her knowledge, tricked her into transforming into a fly, and swallowed her while she was pregnant w/ Athena. After Athena was born (springing fully formed from Zeus's head - ow, painfull) Metis stayed in Zeus's head, advising him. THE LITERAL VOICE IN YOUR HEAD. :D