Susano is a sake loving, lazy, and cowardly descendant of Nagi living in Kamiki village. He carries a wooden sword and is the self proclaimed "greatest warrior ever", regularly bragging about his ancestry. Although he is often found sleeping (claiming its meditation) and is irresponsible Susano is able to gather his courage and pull through when he is needed most. Susano could see Ōkami Amaterasu’s true form from the beginning and loves Kushi.
Doubting the legend of Nagi, Susano traveled to the Moon Cave where he removed the sword Tsukuyomi which broke Orochi’s seal setting him free. Susano attempted to hide and mistook Amaterasu’s aid for being mockery of the gods. Orochi clouded his mind with nightmares wanting a blood pact between the two of them. When Kushi was chosen as Orochi’s sacrifice Susano stood up to Orochi and slew the beast.
In Ōkamiden it is revealed that on his way to face Orochi, Susano found a nearly drowned boy in the ocean. He named the boy Kuni and raised him with Kushi as if he were his biological son. After Kuni leaves to search for his real parents Kushi reveals that she is pregnant with Susano’s child.