Kyouki is the current kirin of the kingdom of Kyou. His master is Shushou. Notably, he remained on Mount Hou for twenty-eight years before choosing Shushou to be the new ruler of Kyou. In contrast to other kirin, he is physically large and not slender. Though kirin are known to be benevolent by nature, Kyouki is often criticized by Shushou for being overly sympathetic, especially for people she deems to be unworthy of sympathy, such as Shoukei. While he often questions Shushou's decisions, she responds with logical explanations behind her actions. Shushou also does not hesitate to slap Kyouki for sympathetic tendencies, remarking only that his greater height makes it difficult for her to physically reprimand him. (Source: wikia)
Shoryu is the king of En. Like Youko, Shoryu is a taika from feudal Japan, approximately 500 years ago. He was originally the leader of a clan, and after it was wiped out, he was taken by Enki to rule the kingdom of En. Though En was originally in terrible condition, his 500-year rule has led to an extremely calm and prosperous nation. Shoryu helped Youko by providing her with an army to retake the kingdom of Kei and rescue Keiki. As a fellow taika, Shoryu feels that he should help guide Youko in her new life.
Shushou, the queen of Kyou, has ruled for over 90 years, but she has the appearance of a young girl, since that was when she was chosen to become the new ruler. She ascended the throne twenty-seven years after the death of the previous king. Though strict and capricious, she has demonstrated herself to be a wise monarch. She also appears to have above-average strength in the anime, being able to make Shoukei bow her head to her with only two fingers. The novel Tonan no Tsubasa relates her journey in the Yellow Sea and how she became the queen of Kyou.
Sekki, the brother of Koshou, is the brains behind the Shisui rebels. When Youko appears searching for Enho, Koshou is about to attack her because he believes she is a spy who is going to give them away, but Sekki stops him. He later explains that he heard the ring of steel, and that Youko's bravery suggests that she is far more dangerous than she appears. Sekki makes all the tactical decisions for the rebels except when fire threatened Takuhou and Koshou overrides him.
Koshou is the charismatic leader of the Shisui rebels. He rallies the rebels to fight against Shoukou, even though he believes that they cannot win. When Youko declares that Shoukou must be spared, Koshou supports her. When the town of Takuhou, the capital of Shisui, is set on fire, Koshou insists that the people must be rescued or else the rebellion has no point, even though the fire is a trap for his fighters. When Youko asks him what he wants as a reward for his service, he asks her to procure a university spot for his brother Sekki.
Gaishi is a friend of Kantai. After the rebellion in Kei, Gaishi becomes part of the five-man squad in charge of defending the Forbidden Gate. Before Youko Nakajima was enthroned, he was in the Baku Provincial Guard. When Risai comes to Kei and barges through the Forbidden Gate in order to beseech the ruler of Kei for help finding the missing Taiki, Gaishi appears at the gate to stop the guards from killing Risai, whom the guards believe is a dangerous intruder. (Source: wikia)
Ikuya Asano is another one of Youko's classmates who is transported to the kingdom of Kou. In the novels, Asano does not exist and Youko attends an all girls school. He goes missing after a battle between Yuka and Youko and is not seen by either of them for some time. Asano eventually becomes part of a group of Shusei and works for them as they traveled through the kingdoms. However, being in a completely alien country and lacking the ability to speak or understand the language, the strain has taken a toll on his sanity. Eventually, Asano questions the reason he was ever brought to Kou and seemingly can't find a reason for his life to go on. He dies at some point later in the anime.