In the article "Aboriginal Australians and Dreamtime Creation Myths," Yhi creates the world and takes care of it herself.

Izanami and Izanagi's son Hiruko helps them create the world.
Izanami and Izanagi have many children that help them take care of the world.
The god Susa-no-o destroyed everything that was created, and it had to start again.
The world was already created, and Izanami and Izanagi only added humans.