A friend of Yukino's. Tsubaki is a talented athlete. Her tomboyish attitude eventually catch up to her when a person from her past, Tonami Takefumi, appears. Initially, she could not recognise Takefumi, who underwent a complete transformation during the three years he was away. Takefumi used this as leverage in his quest to get revenge on Tsubaki.
Shin dislikes drawing attention to himself and prefers to observe situations. He is often cold and aloof towards his classmates, and Yuusuke's constant pestering irritates him. At first, he treated Maria with disdain, appearing to want nothing to do with her, but circumstances proved otherwise and he seems to actually care greatly for her. He pretends to be "rude" to Maria thinking that his actions would somehow lead the other girls to sympathize with her. In Chapter 4, he scooped up Maria in the middle of the class and declared that he would take her to a hospital because of her sprained ankle, making a scene as they leave. Then, he secretly bought Maria a pair of flashy shoes (apart from the ballet shoes he already bought for her) even after earlier commenting that they looked stupid. Despite claiming that he does not want anything to do with her, he finds himself falling in love with Maria, but there is no way that he'd let the "devil" discover his feelings. It is later revealed his "loner" persona comes from an incident when he was a kid where he "choked" during his large piano debut making the media destroy his image. In chapter 23, Meguro insists he will stand by Kawai Maria's side no matter what happens. (Wikipedia)
He's a first-year who later fall in love with Maria.
Yuusuke is a bubbly and cheerful person, who is popular with the girls and generally well-liked. Much to Shin's chagrin, Yuusuke always has an idiotic grin pasted on his face. Initially, he develops a liking for Maria as she is beautiful and has an intriguing personality. He is the first student to approach her and constantly pops up wherever she is. While he is extremely fond of her, it is not yet revealed if it is more than admiration. It seems as if he knows that Meguro likes Maria, because in chapter 11 he calls Meguro out and tells him that if he doesn't step up he might "steal Maria away". Yuusuke taught Maria the "lovely transform". He calls Shin "Megu-chin" and Maria, "Maria-chi". His face forms a comical style with thick dark outlined eyes and a w-shaped smiled when someone (mainly Kawai) is blatantly against one of his ideas. He also confessed his love to Maria later in the series. (Wikipedia)
The protagonist of the story, Maria has a cold personality which estranges herself from her classmates. She says what she wants, albeit too bluntly and harsh, even when she intends to help others. Her arrogant facade and point blank statements are the reasons she is hated by most people and it seems she too is indifferent towards them. Emphasized throughout the manga, Maria also is shown to have the ability to see the true natures of people around her, or—more simply—their flaws. Although she maintains this air of superiority, she actually yearns for acceptance and friendship. Even when knowing the unpleasant outcomes, she often steps into troublesome situations just to prove herself to others. Everyone thinks that she is a devil but they don't know that they're the devils. She gives special regard to Kanda Yuusuke but exhibits much stronger feelings for Meguro Shin, stating that she feels Shin is much closer to her than God and she is much more afraid of being hated by him. Later she realizes she is in love with him. She likes nursery rhymes and hymns like "Amazing Grace." She apparently got expelled because of "punching the teacher/nun," but it has not been explained in detail, though it was revealed that the cross she always wears is from that teacher/nun. She has a habit of pushing out her lips and having her eyes half open when someone says something that annoys her. It is shown that she starts to like Meguro. (Wikipedia)
She is first introduced to us as Nippachi (apparently because she always gets a 28/100 in tests and is always grinning). Upon hearing this Maria stated that Tomoyo was looking down on the very girls that called her Nippachi. This aggravated those girls a lot, and shocked Tomoyo (indicating in a way that Maria was correct). Later, the other girls in the class made Tomoyo give an invitation to Maria for a fake welcome party for herself. The reality was that the girls in the class were going to make Tomoyo drink a lot of alcohol and then say that Maria made her do so. They supposed this would work because they already convinced Tomoyo to lie and say that Maria beat her up earlier. Upon receiving the invite, Maria, who was already aware that no good would come to the party stated that “I think, no matter how much filth you show, I need to go�. Hearing this Tomoyo pushed Maria down the stairs, insisting that she was not filthy like Maria. Tomoyo ended up crying. Then Kanda Yuusuke showed up at the party with Tomoyo. He smoothed out the whole situation. The next day, Tomoyo appeared in school with a cast around her legs and crutches. Then the other girls insisted that Maria pushed her, which was not true. The other girls in the class asked Maria to be Tomoyo's replacement; Maria abruptly refused, saying that she could not just go around smiling at everyone, and that she could only be herself. It was very soon after that the class discovered that the cast was fake. They then began to call Nippachi a liar, even though Nippachi insisted that she fell down the stairs that morning, which was later proven wrong. Tomoyo did not show up to school for the next week. This was later considered a problem, so the class and teacher told Maria to bring Tomoyo back to school. She and Kanda went to her house together. They spoke to her normally and then left. The following day, Maria went to Tomoyo's house before school and told her to come to school with her. At school, Nippachi defended Maria and also put an end to the other students and the teacher calling her Nippachi. This begins the friendship between the two of them.