The youngest of the five brothers of the Ran family. He is eighteen years old. It is said that, out of his four older brothers he was the most worthy of the name Ryuuren Ran because he is a genius. He calls his older brothers foolish and doesn't call them by their name, rather: Shuuei = "foolish elder brother the fourth." Recently, he's called Shuurei, Soul Friend #1, and Eigetsu, Soul Friend #2 (He refers to Yougetsu as Soul Friend #2.5). He does things on his own time and is quite impulsive: when he was going to buy ingredients for chicken stew with Shuurei, he ended up buying soy beans, then he traded that for boiled eggs, then traded the eggs for spring onions, then the spring onions for wood blocks, then flowers, then fish, then straw, and then he gave away the straw to a little girl and just ended up with one stalk of straw. Later in the series, he goes ghost hunting after hearing about a late-night ghost. He also pulls out his flute and plays it without warning, often off key. Since he can't be easily told what to do and is very unpredictable, he's necessary in the Ran family. Although, because of this behavior many find him weird and annoying, so they usually distance themselves from him. Shuurei was the only one who put up with him, so he said that she's now his soul friend. Also according to Kurou he is also a candidate for Shuurei's political marriage. (Source: Wikipedia)
The middle brother. He finds the world very boring and seeks to amuse himself, morals are of no consequence. Upon being told by his grandfather that he is to marry the Kou princess, Sakujun arranges to meet Shuurei in person, under the disguised name of Lin Senya, and finds himself intrigued by her. He dies right before season 1 ends. He also shows himself to Eigetsu in season 2 for the first few episodes as a ghost, and also as part of Shuurei's flashback. Even though he is told to be seeking amusement from her until he gets bored, he slowly falls in love with her.He said in the game with Seiran that will give her anything she wants and will do anything in his power to satisfy her and that the only thing/person in the world that matters to him is only Shuurei. In his last moments when he's about to die he again comments on how he liked Shuurei with her hair down. In his mind he said that in the games he played so far Shuurei is the only one who has the ability to easily beat him while he had to struggle. Then when he asked Shuurei to give him Gok-Long tea he puts poison in the water and antidote in the Gok-Long flower. In the end, she still didn't pour him the Gok-Long tea causing him to die, and in his very last word he said Shuurei. (He never called her by her name.) (Source: Wikipedia, edited)
A crossbread dog with a cheerful approach to life who tells the story of his Owner, and what happens to her. He is very kind and knows to do the right thing like a loyal dog would do everyday
A youkai guardian, partners with Sui.
Isozuki no Nezumi is a polite youkai that can turn into rat. His master ordered him to bring the egg of the Tatsumi youkai, the one that Natsume took home. The reason is that meat of young Tatsumi youkai is very delicious and it's blood can give eternal youth.
The owner of the inn that Natsumi Takashi goes to in episode 8. It is told that while she was young, she came to like a person, known as Keiichi, who was around Takashi's age. However, Keiichi was sick. One day when he fell seriously ill, Chizu went to Sasafune to get mermaid blood. She fed Keiichi the blood and he was later on transferred to a faraway hospital. Thinking that she had made Keiichi's life miserable, she spends everyday waiting for him at a train station. It is revealed at the end of the episode that Sasafune did not give a vial of mermaid blood to Chizu. It was a vial of grape juice.
Fair Ukon Yatsurugi is an assassin and member of the Twelve Heavenly Generals of the Martial Fist. Narcissistic and honorable, Ukon is a samurai skilled in the fast-draw technique called Demonic Beheading. It's an art that takes brash Kyouichi Houraiji by surprise when the young General is set to kill the Magami delinquent. Ukon has a deep admiration for all things beautiful, and a noble sense of justice. When he senses a change in tactics and spirit from Kyouichi, he has no qualms about forfeiting the assassination request and befriending Kyouichi instead. He later returns to aid in the battle against Yagyuu. In the omake episode, Ukon Yatsurugi shows a great sense of care for Kureha Mibu, and the two seemingly remain comrades after everything.