In Amaterasu, Susanowo’s actions primarily affect the advancement of the plot by:
b He causes Amaterasu to take away the sun.
Susanowo's disruptive behavior and conflicts with Amaterasu lead to her retreating into a cave, which causes darkness to fall upon the world. This action is crucial for the plot development, as it prompts the other gods to intervene and coax Amaterasu out of her hiding place.