When Kuni's character was created Kuniomi Matsushita, the Director of Ōkamiden, based his design around the fact that he was Susano and Kushi's son and a rambunctious kid but cowardly at heart. Kuni's final design was based on these ideas. One of Kuni's early designs had very different components all based on different parts of his background and personality. The design had Kuni using a simple twig as a sword, which was inspired by Susano's wooden sword and was supposed to seem like a younger version of the sword. He also fixed his hair with Kushi's large comb. This design was well recieved by the game's makers and made it through to Model production; it was eventually animated. It wasn't until the creators watched Kuni riding on Chiniterasu's back on a Nintendo DS screen that they realized the design did not work. According to Matsushita there were multiple reasons why the design did not work: one reason was the number of different features on the character model caused it to appear too "mixter-maxter" from behind; people could not recognize him well because of his hairdo when the camera was about to look down on him from above. Matsushita considered altering different aspects of the game such as the camera movement, so that they could keep Kuni's old design. In the end he decided the model had to be changed and, according to Matsushita, went as far as bowing down and begging Kuni's designers to redesign him. 
Kuni's final model ended up being a small boy who always carries his sword on his back. He wears a one piece purple outfit which has a huge tear down the middle. He has a small red round nose, and small round eyebrows. He also has a bruise on one of his cheeks. His hair is tied into buns on each side of the back of his head which are styled to look like Chibiterasu's winglets (or Paint Brushes).
Kuni is Chibterasu's first partner in Okamiden. He is the son of Susano and Kushi. Kuni first meets Chibiterasu when he notices a girl crying near the river in Kamiki Village, thinking that Chibiterasu was bothering her. After the girl explains how the mirror that belonged to her mother was stolen by demons, Kuni promises to get her mirror back, despite his fear of demons. He and Chibiterasu team up to travel to Hana Valley where the mirror was taken. After traveling through the area, Kuni and Chibiterasu confront Master Anura, who has taken Hana Valley over. After Master Anura explains that only a descendant of Nagi can defeat him, Kuni is struck with fear and exclaims that he is not really the son of Susano, meaning he is not a descendant of Nagi, and runs away from the massive toad, leaving Chibiterasu to fight Master Anura alone. However, after Chibiterasu manages to make Master Anura spit up a fruit from the Guardian Sapling of Hana Valley, Kuni returns and apologizes to Chibiterasu for running away. The two team up to defeat Master Anura and they both retrieve the mirror. After there time, after metting Chibiterasu's second partner, Kuni gets swallowed by a giant fish. After Chibiterasu and his 2nd partner defeat the fish, Kuni is rushed on waves, and is being pushed on a log. He slams Chibiterasu's face to send him to the island, while he goes down. It is not showed if he lives or dies. Template:Spoiler End
- English translations of concept art from the first Ōkami game had his name as Nushi, both this and his final name, Kuni, come from his Japanese name, Kuninushi.
- Kuni appears to believe in the gods as he can see Chibiterasu's red markings from the start.
- He inherited his father's cowardice .
- Like most characters, Kuni gives Chibiterasu a name different from his own. From the moment Kuni meets Chibiterasu, he calls him "Mutt", even after hearing Sakuya refering to him as Chibiterasu.