One of the dragons of Heaven, a fourteen-year-old schoolgirl descended from the keepers of Mitsumine Jinja, masters of inugami (dog-spirits), Yuzuriha is exceedingly energetic, often diffusing latent tension between Kamui and the rest of the Ten no RyÅ«. Yuzuriha is attended by her own personal inugami, Inuki, who can transform into anything she desires and who only others with occult powers can see. She was teased throughout much of her childhood as her classmates believed Inuki was her imaginary friend. Because of this, Yuzuriha made a vow that she would never fall in love with (or even date) a man who could not see Inuki. However, the first person outside of her family that she meets who can see Inuki is ShiyÅ« Kusanagi—a Dragon of Earth. Yuzuriha falls in love with Kusanagi, regardless of their conflicting fates. In Tsubasa Reservoir Chronicle In Edonis country, she's a player who's paired up with Kusanagi Shiyuu. In Tokyo, she's one of the seven fighters of the Tower faction.
Daitetsu, or Mr. Kunikida, is the Chief Director of the TAC. When Kaede and Momiji were born, Mr. Kunikida raised Kaede like his own daughter, but he exploited her ability to track down and kill the Aragami. However, when Kaede sacrificed herself, he felt heartbroken. With Momiji in the TAC, Mr. Kunikida decides not to exploit her abilities like he did with Kaede and instead treated her like a normal girl. Source: Wikipedia
Tamaki is also childhood friends with both Konomi and Takaaki the two see her as an older sister. She left them when they were both children, having to go to an all-girls boarding school. Her promise to come back to Takaki in the final year of high school is what prompted her to leave her boarding school. She is very confident and comes from a rich family. She is well versed in traditional Japanese arts and traditions, yet still is a modern girl in her own right. In her group consisting of Konomi, Takaaki and Yuuji (Tamaki's younger brother), she is the strong and dominant personality and is acts as the older-sister figure. She often addresses herself as "Tama-oneechan".
Takaaki is the main male character. Takaaki is childhood friends with Konomi and sees her as a younger sister. In the anime, it is noted that he has an aversion to most girls save for Konomi and Tamaki, mainly because of their childhood friendship. He is a kind young man who, despite his shy nature around girls, is often very kind to them when the situation arises.
Very young student (10 years old in the beginning) in Nodame's school in Paris. His goal is to be a conductor. In OVA 2, he became 15 years old and is in love with Chiaki's cousin, Yuiko.
A former member of Tokyo Metropolitan Police, Ryoko uses her police instincts to help the TAC. Ryoko uses her standard police issue weapons in conjunction with weapons modified to be used against the Aragami. She is in love with Kunikida. Source: Wikipedia
Mitsuki is friends with both Takayuki and Haruka, but secretly she has feelings for Takayuki. In high school she was a competitive swimmer, but shortly after Haruka's accident, she finds herself leaving swimming to tend to Takayuki. She throws herself at Takayuki when he fails to climb out of his depression, and reveals her feelings for him. Mitsuki is well-meaning, but suppresses her feelings, allowing them to bottle up and explode in dangerous ways. Mitsuki also believes that she is responsible for her friend's accident, as she was the main reason why Takayuki was late for his date with Haruka. (Source: Wikipedia)