Toshiharu Shibahime is Tsubasa's father and a designer of clothes for children. He said that when he designs dresses, he takes Tsubasa as a model and thinks of which clothes would fit her. He also made several dresses for her. He's handsome and good-hearted, but quite clumsy, and he cares deeply about his daughter. For reasons unknown, he's physically very similar to Asaba.
Mingchao’s grandfather had raised her since she was a baby. He was the creator of the Eto Gun and is an immigrant from China. When he died, he left the gun to Mingchao, but he took the secrets of the gun with him to his grave. He sometimes appeared to Mingchao as a ghost or in a dream, giving her instructions or information about the gun. Apparently he wasn't a very pleasant person, but he cared very much for Mingchao. Source: manga
Birthday: April 29 Zodiac sign: Taurus Smart, attractive, athletic, and talented like Yukino, Soichiro Arima becomes Yukino's rival at school. Very handsome and popular, Soichiro excels at kendo and becomes a national champion. He is at first smitten by Yukino, unaware that she secretly hated him and constantly tried to compete with him. After unwittingly discovering that Yukino is not the model student everyone thinks she is, Soichiro blackmails her into doing his school work so he can spend more time with her. After resolving the issue and becoming each other's first true friend, they eventually fall in love. Arima has alot of issues with his past. He is scared that his family will hate him and reject him like they once did. However, because of that, he decided he had to become a perfect person. But, with Yukino's help he realizes his parents accept him for who he is and that he should love all sides of himself and show his real personality proudly to everyone. He was abused by his maternal mother in the past. He was abandoned by his maternal mother, and then his paternal father, Reiji found him and gave him to Soji and Shizune (his adoptive parents) to raise. His adoptive father is the eldest brother of his real father hence his uncle.
Yukino and Soichiro's lazy and girl-crazy friend, very handsome and popular. Although bright enough to be accepted to the selective Hokuei High School, Hideaki is a terrible student, and spends most of his time surfing or chasing girls. Hideaki and Soichiro are considered the two most handsome boys in school, and while Soichiro is largely indifferent to the attention, Hideaki makes the most of it. During their school's annual culture-fest, Hideaki's class mounts a "Hideaki Asaba Dinner Show" which is a big hit with all the girls, but gives Yukino and Soichiro the creeps.
Son of the woman who Tsubasa's father is dating. He's a member, along with the minor characters Martin, Joker, Ushio and Atsuya, of an indie-rock band (called "Yin & Yang") Because of his bleached hair and skull jewelry, he is initially looked upon with suspicion by Tsubasa. Because he wants his mother to be happy and eager to have a little sister, he has no objections to their marriage. However, he makes the mistake of assuming that Tsubasa is an elementary school student due to her short stature, causing Tsubasa to have a spectacular meltdown. (Tsubasa is in fact, one month older than Kazuma.) His appearance consists of bleach hair and skull jewelry. It usually gives people the wrong impression of Kazuma. He is voiced by Akira Ishida. Kazuma's most valued treasures are Tsubasa and his music. He slowly comes to terms with the fact that his love for Tsubasa is so much more than brotherly affection. And also with the fact that music will eventually drive him apart from her...
The youngest of the three Miyazawa daughters, Kano is known for her shoujo manga and novel obsessions. She uses the knowledge from her love stories to help out Yukino when she is in a psychological pinch. Later, she becomes an editor of her favorite author, Aya Sawada, one of Yukino's high school friends
As a fat, sickly, and spoiled child, Takefumi was constantly picked on in elementary school. He was somewhat protected by the tomboy Tsubaki, who, while protecting him from other bullies, would bully Takefumi herself. When he asked Tsubaki why she paid attention to him, she told him that a teacher had asked her to look after him. After hearing this, Takefumi is humiliated as he had never been in his life; he is humiliated because he had believed that he was somehow special to Tsubaki, but he realized that she did not care about him at all, and was just obeying a teacher's request.