Rangyoku is a resilient and cheerful sixteen year old girl who lives in a rike in the Ei Province. She and her younger brother, Keikei, originally came from the Wa Province. When their parents died late during the reign of Jokaku, they elected to leave Kei, but they changed their minds when a new ruler supposedly ascended. Despite the fact the ruler, Joei, turned out to be a false queen, Rangyoku and Keikei remained in Kei and were able to enjoy the ascension of the true monarch, Sekishi. In the rike, Rangyoku helped take care of household tasks for one of the village elders, Enho. When their rike is attacked by youma, a number of people are killed until the arrival of Chuu Youshi, a young woman who is staying with Enho as a guest. Rangyoku quickly becomes friends with Youshi and helps teach her about every day life in the Twelve Kingdoms. However, when Youshi is away, men ordered by Gahou, the governor of Wa, arrive to kill Enho. Keikei is badly injured and Enho is abducted. Rangyoku is fatally wounded and stumbles into Youshi's room, where she finds the seal of the king of Kei. Realizing that Youshi is the new monarch of Kei, Rangyoku spends her last moments concealing the seal so the attackers will not learn that the ruler of Kei has been residing with Enho and prays for Youshi to save Keikei. (Source: wikia)
As a taika from Japan, the kirin of En (or Enki) is also known as Rokuta. He was found by his nyokai after his parents abandoned him at a young age. He originally felt that humans could not rule a kingdom properly and was reluctant to choose a new king, but he felt that Shoryu truly deserved to become king of En. He assisted Youko in her journey to Kei and played a part in helping the Saiho of Tai. (Source: Wikipedia)
The blue monkey that dwells inside Kei's sword. Actually he is a part of Youko's conscience who is constantly teasing her. Aozaru (�猿, Azure Monkey) is the physical manifestation of the sentient spirit of the scabbard of the Suigūt� (the Water Monkey Sword). The sword is a royal treasure to the kingdom of Kei and can only be wielded by the kingdom's rightful ruler - as such, Youko is the only one who can draw the sword from its sheath. The sword was forged from a water demon that a previous great ruler of Kei had defeated while the scabbard was created from a long-tailed monkey demon. From the scabbard hangs a large jewel that can heal the one who holds it. The sword is not only capable of killing demons and sages and breaking substances like metal chains, but is also capable of presenting visions of the past, future, and things in the distance. The sword and scabbard must be kept together, otherwise the phantasms of the sword appear unchecked while the spirit of the scabbard is free to act as it wishes. When Youko loses the scabbard, it appears in the form of Aozaru, the blue monkey, and taunts her with her doubts while the sword presents her with visions of things she does not wish to see. Eventually, Youko, overcoming her own doubts, kills the monkey and picks up the dead scabbard. Because she has killed Aozaru, the sword can be drawn from the sheath by anyone, though it can be wielded effectively only by Youko. (Source: Wikipedia)
The black Kirin of Tai, Taiki was blown to Wa in a Shoku before he hatched. 10 years later, he was found and returned to live in peace, where he found his king and returned to Tai to live. Shortly after, he disappeared without a trace.
Rakushun is a hanjyuu with the form of a rat. Though Youko is initially distrustful of him, he becomes her first good friend after she is taken from Japan, after managing to teach some essential skills to Yoko about life. Rakushun is proud of being a hanjyuu and is somewhat uncomfortable in his human form; Youko only learns that he could appear as a human after quite some time. He is very intelligent and knowledgeable and enrolled in the Daigaku of En. Youko wishes him to teach her about the politics and customs of the world.
The King of Kou, known also as Chou, has ruled his country for fifty years and has tried his best to improve the state of Kou. However, he comes to feel that he will never be able to bring Kou the prosperity seen by the neighbouring kingdoms of Sou and En, whose rulers have ruled for six hundred and five hundred years respectively. When Joukaku, the ruler of Kei, dies after a reign of six years, the King of Kou comes to fear Youko's ascension to the throne of Kei, believing that as a taika like the King of En, she will be able to bring the ruined country the same prosperity as En and Kou will continue to fall behind. As such, the King of Kou secretly supports the false queen Joyei, the younger sister of Joukaku who seized the throne without being chosen by Keiki, and makes various efforts to capture and kill Youko.
The youngest of the nyosen on Mt. Hou. When Taiki first came to Mt. Hou, he took a liking to Youka and she became his friend and primary caretaker, after Sanshi.