Ryuuki Shi is the reigning emperor of Saiunkoku. He is nineteen years old when the story begins. The youngest of six brothers, he was an unlikely candidate to ascend to the throne. Of his five elder brothers, four killed each other over the succession and one was exiled for treason. As a child, Ryuuki was badly mistreated by his mother and his brothers, except for his brother Seien, who seemed to be the only one who truly cared for him. His other brothers and mother used to beat Ryuuki and lock him in a closet for hours at a time, telling him his birth order was bad and that he stole affection from his siblings. These experiences led to a lingering fear of the dark and sleeping alone. Ryuuki often took refuge in the garden or the imperial archives, where he first encountered Shouka Kou. Shouka tutored the young prince and encouraged War General Taifu Sou to teach him swordsmanship. Due to his father's dying wish, Ryuuki ultimately rose to the throne. However, he avoided any involvement in politics or government, wandering the palace for hours so no one would be able to find him. He even spread rumors that he preferred the company of men to fuel speculation he could not produce an heir. Ryuuki secretly hoped that Seien, his beloved older brother, would eventually return and take his place as Emperor. Ryuuki's avoidance of responsibility came to an end when he met Shuurei, who told him of her dreams of making a better life for the nation's people. Ryuuki decided to take on his responsibilities and become a respectable Emperor. (Source: Wikipedia)
Shusui is the Chief lady-in-waiting in the imperial household. Ran Ryuuren noticed once while having tea with Shuurei that she is very skilled for a lady-in-waiting (Kourin had accidentally dropped the tea pot and Shusui had caught it). She is part of the Black Wolf clan.She secretly loves and admires Shouka Kou,the father of Shuurei Kou,librarian by day and the leader of the wolfs's clan ,Black Wolf himself. He retired from being the leader after he felt in love with Shuurei's mother,a noble woman who Shouka was supposed to kill,because of a mission he was given. (Source:HotaruKara)
Works in the persecution department. From the middle-high class, he proposes to Shuurei under his father's orders despite his lack of personal interest in her. When he first appears, he is bearing many tanuki-themed accessories including a golden statue, causing Seiran to nickname him "Tan-tan." He does not like putting effort into anything and thus is both intrigued and annoyed by Shuurei's continual determination to do her best. However, Tan-tan can clearly perceive a situation's complete context or a person's true character, making him a valuable asset to his department, and he tries to lessen Shuurei's naiveté by showing her the evils of the world. Seiran considers Tan-tan to be a practical influence on Shurei and is unusually willing to engage him in conversation. Nevertheless, Seiran also likes to pelt Suou with bamboo shoots and make him pay for random purchases, calling him "Saifu #2" (wallet #2, after Ensei as #1). Tan-tan is roped into the counterfeit paintings investigation by Shurei and ends up arresting his father, who was used in a larger plot. He saves Shurei from being fired when Riku Seiga steals her research proposal. Since then, Tan-tan has followed Shurei and re-entered the persecution department as her assistant.
He is a Lord of a forest. The Youkais that live in the forest often says that he's foolish for befriending humans because he liked them.
Tama was found as an egg in Episode 4. Tama means eggy.
She is a friend of Sawako's from back when they were in high school, and they were both in the light music club together as part of the band Death Devil. She and Sawako used to try to outdo each other on the guitar. Her stage name is Christina.