Like her name, she is the thirteenth daughter or princess of the Ran clan. She is the half-sister of Shuuei, Ryuuren, and the Ran triplets, but she has the closest relationship with Shuuei. She was sent to the palace to become Ryuuki's consort by the triplets (with the choice to either become a consort or marry Seiran), and she soon became a target of assassination by a mysterious group. The head assassin was none other tha Jin Shiba, her first love, who was a death-row prisoner. After Shusui's departure, Jyuusan-hime replaced her position as head lady-in-waiting and later on challenged Shuurei in a contest of making steamed buns. She has all the skills of both being a princess and a fighter, being raised by the Shiba family, a famous retainer clan of the Ran clan who specialized in combat. By looks, she resembles Shūrei so much that Shūrei was once given the task to impersonate her. She is the most likely candidate to be Ryuuki's concubine, should Shuurei continue to show disinterest in the time period that was given
Seiga Riku is the undersecretary of Censorate, known as the "Official Killer" for his ruthless persecution of officials. He first appears during Shuurei and Suou's investigation of counterfeit currency and artwork, posing as an official looking for a position in order to join Shuurei and Suou's investigation. In truth, he was actually sent to monitor and report on Shūrei's actions. Seiga is an ambitious and cynical man who does not think highly of Shuurei, particularly because of her idealistic outlook towards working for the government, and he often harasses her. A promising and confident official, he is known for his willingness to sacrifice others to achieve his goals, much to Shuurei's displeasure. However, Shuurei looks to him as a senior during her time as a censorate official and regards him as a rival in hopes of winning his approval through her own efforts, a relationship that Seiga reluctantly reciprocates. Seiga is later responsible for dealing with accusations that lead to Reishin and Kouyuu losing their positions in the Department of Civil Administration. (Source: Wikipedia)
A Youkai who, in the fifth episode, mistakes Natsume Takashi for Natsume Reiko and asks for his name back. Kirinoha's name isn't in the Book of Friends and as the episode progresses it seems that Reiko has played numerous amounts of pranks on him. However Natsume does his best to prove that isn't so, even to the extent of fainting due to sickness and exhaustion. While Reiko was alive, he told her that he wanted to see the sea. However, being born from the forest, he believes that he isn't allowed to leave the forest. His name was on branch that was on top of a very tall tree. Reiko told Kirinoha that he has to wait 50 years before retrieving his name or else a series of catastrophic events will occur. When Kirinoha climbed to the top to retrieve his name, he was able to see the sea. It seems that Reiko played pranks on him so that one day, when he does retrieve his name, he will be able to see the sea.
Age: 15 (debut), 25 (end) Birthday: May 19, 1993 Ishizawa attends the same Junior High as Takagi and Mashiro. Ishizawa draws ecchi headshots of girls and brags about it. He later insults Mashiro's drawings. He is a large nuisance to the duo. (Source: Bakuman Wikia)
Ashirogi Muto's editor at Hissho Jump. He was the editor for Private Evil Eye Nougami Neuro, Beelzebub, and Toriko and is currently the Vice Editor-In-Chief at Hissho Jump.