Ryoshun

Ryoshun was one of the Kami, the children of the Sun and the Moon.

Death
Onnotangu ate his children when he feared that they might overthrow him. Hantei however was saved by Amaterasu, and he later freed his siblings by cutting open Onnotangu's stomach. The Kami fell out of Tengoku into Ningen-do, the Mortal Realm, through a hole in the sky. Ryoshun, who had been inside Onnotangu's stomach the longest, had already died, and so instead he fell to Meido, the Realm of Waiting.

The Tenth Kami
""Ten Kami fell from the sky. One fell to Jigoku, but only eight now walk the mortal realm. Let not the mortals sully Ryoshun's memory by speaking his name. Let his grave be a place where only gods may enter.""

- Hantei

Hantei commanded that Ryoshun's name be forgotten, so no mortal would sully his brother's name. He also commanded that only gods could enter Ryoshun's grave. The grave site was located where the Badger Clan were eventually founded, and the clan was secretely tasked with guarding the grave of the tenth kami.

Meido
In Meido, Ryoshun would come to work alongside the Fortune of Death Emma-o. After Emma-o judged a soul, Ryoshun would guide that soul to the appropriate Spirit Realm.

Lying Darkness
During the Battle of Oblivion's Gate in 1133, Ryoshun fought against the Lying Darkness, destroying Oblivion's Gate and supposedly dying again.

Gifts of Ryoshun
Unlike the other Kami, Ryoshun has no descendants or followers to bear his name and celebrate his memory in the mortal world. In order to correct this issue, Ryoshun delved into the essence of each of the spirit realms under his protection and crafted a series of talismans to be given to those individuals worthy of his blessing.

Referenced in the Tao
""Of the nine children of the Sun and Moon; myself, Doji, Akodo, Shinjo, Hida, Togashi, Bayushi, Shiba, and Fu Leng..." began the Emperor.

''"No," said Shinsei"

''"No?" my brother asked quizzically.

''"The Sun and Moon had ten children, though you will never know your youngest brother.""

- Tao of Shinsei

Some scholars believed this passage in the Tao of Shinsei might not have been a reference to to Ryoshun, but a reference to "mankind" or even Uikku.