Soo-bin is the rockstar/singer among the guys. His attractiveness is similar to Ji-hoo. Soo-bin starts off as Jae-yoo's companion in the new home, and in contrast to Ji-hoo (even though they are good friends), he's tame and willing to talk to her. He tells her that Ji-hoo is a good person once you get to know him. He also starts to like Jae-Yoo. Even after he found that Ji-Hoo and Jae-Yoo became couple, he doesn't give up and continues trying to make Jae-Yoo his. (Wikipedia)
A 6th grade student and the Elementary School Board Chairman. The youngest son of the Imonoyama zaibatsu, the founders of Clamp School, he has inherited the family fondness of doing absurd things just for the sake of doing them. Nokoru has one of the top IQs in a school full of geniuses and NASA has been vying for the mind of the elementary schooler. He also has the unique ability to detect a lady in distress from two kilometers away. For this reason, he established the Clamp School Detective Agency, although this was also an incentive to get out of his Chairman duties. He is also the only one out of the three young detectives that doesn't play a sport.
She specializes in infiltration and looks over Haruka in Sierra's absence. She seemed to harbor a personal grudge against Sierra, and the source of that was later revealed to be from her own tragic past. (Source: Wikipedia)
A mysterious woman who tends to the Great Tree Escalus. She has a sad, doll-like face with some marks on her forehead and cheeks, and speaks in a rather polite and mysterious manner. She appears to be ageless as she looks the same as she did fourteen years ago. She eventually explains that Escalus is fading and has implanted its seed inside Juliet, telling the girl the tree's will late in the series. She is a part of the tree, and underneath her robes are wood-like limbs and skin. During the climax, she steals Juliet away and forcibly begins the rites of sacrifice, determined for the Tree's revival with little care for interruptions or alternatives. In the final battle for Juliet's safety, she mortally wounds Romeo shortly before being vanquished by him. Her name is likely a nod to the heroine of Shakespeare's famous tragedy, Hamlet. [Wikipedia]
Romeo's fiancee. She seems to be a stand-in for Count Paris (from the original), though she is Romeo's fiancee, siding with the Montagues, instead of a relative to Duke Escalus and Juliet's suitor.
A tomboyish girl. The only girl in a male-dominated family, with three brothers and her father. She started wearing boys clothes, as well as adopting a boyish haircut, when she was in first grade and after her mother was killed in a car accident. It is revealed in vol. 10 that part of the reason she chose to do so was because of the teasing in elementary school of a boy named Jôtaro Kai, who always bullied her, especially whenever her older brothers tried to protect her. Since then, she consistently wears masculine clothing, even to school, to the irritation of most of her teachers. Most of the girls at school idolize her and she is known for being mobbed every Valentine's day. When Ito finds out that Makoto is a guy, she decides to help him and eventually falls in love with him. Throughout the series, Ito starts to become more feminine, because she wants to be the perfect girl for Makoto, at first unconsciously then with more intent. Ito has various admirers such as Toki-sempai, two years ahead of Ito, who wants Ito to be much more feminine, become his girlfriend and go to college with him. Also Tsugumi-sempai, one year ahead of Ito, has an obsession with Ito, especially as a male figure, going so far as to call her "Ito-kun," a primarily male suffix. Finally there is Sakamoto, a "masochist" that likes both Ito and Makoto, after "running into" Ito during a class trip to Hokkaido. In volume 10 Ito meets Jôtaro again and he confesses that he teased her because he liked her. Ito is surprised; she remembers that she used to like him too, but she rejects him telling him that she is already in love with someone else. As an actor, Ito relies on her raw charisma and physical ability rather than actual technical skills. She receives average grades in school though she appears to be abysmal at math. Her cooking skills are lacking, though the author has noted that Ito is good at "cooking for a crowd." She also is rather headstrong and doesn't think through situations before barging in, leading to some precarious moments with her admirers. The characters for Ito spell out "thread," resulting from her father's wish for a name that is "slender and pretty" and her mother's wish for a name that "can be used to make something." Though Makoto's father considers her name a bad omen, as "a breaking thread," she considers it a blessing and as symbol of her creativity, which is consistent in the series. Source: Wikipedia