The current demon lord, spawned 300 years after the previous demon lord was killed. Due to reasons that has yet to be revealed, she has inherited no memories of the past unlike all previous demon kings.
Mao is extremely powerful, according to her aide she is the strongest demon lord ever spawned. She does not need to eat or sleep, money is not a problem as she is able to create gold and other precious metals with her magic.
She uses a double in the form of a fairy to interact with the outside world, the double's view is shared on a screen with her aide in the demon lord castle throne room.