Aunty's personality reflects Max's in a way that she built a physical world for herself and she will not allow for any evolution or change, much like Max who is incapable of letting go of his past. She was selected because Aunty's age was to be indeterminate, to underline the fact she is a survivor with a lot of charisma, capable of building a place like Bartertown and that she represents both good and evil. Tina Turner was selected to play the role because she is perceived as a positive persona and to give the sense that Aunty Entity was once a hero which amplifies how tragic that character is. (.), they love their world too much, and they want to hold on, and they won’t allow the next, natural evolution, natural change, to happen.
They create a new order, and they love that world too much, then they become what you might-call holdfast. Unfortunately, according to Miller, in the process she became a tyrant : Aunty Entity built Bartertown with good intentions, trying to rebuild civilization, bring back trade and give people hope for tomorrow. When creating the character, George Miller started with an assumption that 'today's tyrant is yesterday's hero'.