I am not entirely sure if the characters should be Japanese, but I like playing a young hapless Japanese maiden anyway, so here's my character!
Picture:

Name: Mika Yamaguchi
Age: 19
Gender: Female
Teacher or Student: Student
Personality: The president of the student council in her previous school, Mika is a headstrong and assertive girl. On the outside, she seems like an ice queen who only helps people if it is in her own interest. This attitude of hers has garnered her many enemies, though there are some who swear loyalty to her in order to gain some benefit for themselves. Mika only has two good friends, Yuko and Sachiko, whom she had grown up with. Both know her to be a gentle, kind person on the inside. She would never show this side of her to other people, though, because she knows her enemies will take advantage of it. (In short, she's pretty much a tsundere.)
Bio: Mika is the only child of a rich business tycoon. She spent most of her childhood alone in her family mansion, with no one to play with. Her father was always busy at work, and seldom in the country, while her mother was always out with her rich friends. From her lonely childhood, Mika has sworn never to allow herself be hurt again, by her absent parents and other people. This was the attitude Mika entered elementary school with. Despite her cold exterior, two of her classmates always treated her well. They were Yuko and Sachiko, who always invited her to eat lunch and play with them, even though Mika always rejected them at first. Slowly, she began to open up to them, like she had never opened up to anyone. The three girls became fast friends, and Mika has been classmates with them since elementary school to junior high.
Mika doesn't have time for boys. The two boyfriends she has had, she had made use of them like servants. She has never slept with either of them, though she has made one of them finger her before.
Mika's father's decision to send her away to St. Charles came as a surprise to Mika. Her father never really cared about her education, except to ensure she scored nothing but A's. Mika had been beaten before for failing to maintain a perfect grade, but she generally has no problems with it. It made sense to her, however, that a business tycoon would send his daughter to a prestigious school, and since there was no way Mika could challenge her father's decision, she accepted it without question. Little did she guess that her father was preparing her for marriage to a potential successor of his company, and had sent her to the school in order to learn some discipline and take that smug attitude of hers away. Mika doesn't know it yet, but she is going to have a hard time at St. Charles...