Daishikou

大司寇

Daishikou served as the Minister of Law in the kingdom of Kei when Youko Nakajima ascended to the throne. The anime portrays the Minister as a woman, whereas the novel does not specify the Minister of Law's gender.
The Minister of Law aligns with Seikyou's faction in the court and therefore refuses to enforce the law if doing so would strengthen Seikyou's influence. In the anime, she openly undermines Youko's ability to judge who is trustworthy by claiming that ministers opposing Seikyou are actually against Youko and her efforts to reform the court.
In both the novel and the anime, Youko suspects she cannot truly trust any of her court ministers, as they are either aligned with Seikyou or opposed to him. Following the accusations against Koukan, the governor of Baku, and the Sankou, along with the death of the Taisai—the minister serving as Palace Administrator and Seikyou's most vocal opponent—Youko immediately exiles Koukan and the Sankou and demotes all members of Seikyou's faction. Seikyou is forced to take the position of Palace Administrator, while the Minister of Law, along with the Ministers of Rites and Lands, are demoted to the positions of the Sankou.
In the anime, the Minister of Law remains Seikyou's most visible ally, conspiring with him and exploiting Youko's absence from court to maintain their power. At the end of both the novel and the anime, Youko threatens the Ministry of Law to ensure proper enforcement of the law and the delivery of punishment, reminding the Minister of Law and the Ministry of Justice that she had ordered the arrest of Seikyou and his cronies. The anime depicts these events similarly, with the Minister of Law falling quickly silent in response to Youko's threat, recalling that the monarch had ordered Seikyou's arrest.