She has dark hair liberally streaked with gray and sharp, blue eyes. She is slender, in a bony way.
Bennae is quite weak in the One Power. Her level of strength is described by "The Wheel of Time Companion" as 37(25) which is a quite low level in Aes Sedai hierarchy.
She went to the White Tower when she was sixteen. She spent thirteen years as a novice and eleven years as Accepted before being raised to the shawl. Although her age is not known, judging by her graying hair she is probably more than 200 years old.
She teaches history to novices in the White Tower.
Her sitting room is cluttered with haphazard stacks of books and specimens of many different birds, snakes and mammals.
She sided with Elaida's White Tower after the split.
She asks Egwene a series of questions on history which she cannot answer, though she tells Bennae the truth about Shein Chunla and about the existence of the Thirteenth Depository. Bennae scolds Egwene but is obviously intrigued and may have checked out the leads that Egwene suggested would back her up.
She lands in trouble after asking around about the Thirteenth Depository. She asks Egwene for a solution out of her predicament, which Egwene gives. Bennae actually tilts her head in thanks to Egwene.