Mashiro Shiina

Mashiro Shiina is the main female protagonist of the Sakurasou no Pet na Kanojo anime and light novels.

Mashiro resides in Room 202 of the Sakura Dormitory. Mashiro is a world famous artist who transferred into Suiko as a second-year to learn how to draw. She aims to drawing manga.

Other than drawing, she is otherwise extremely reliant on others. Thus, lacking even the most basic common sense. As a result, Sorata is forced to constantly take care of Mashiro, to the point that he has to practically dress her, or she will go to school without clothing.

Unwilling to pay attention in class, Mashiro has very poor grades. However, she is able to memorize what she can see at any moment by thinking of it as a picture. In order to stay in the school without failing; she memorizes the answers for the make-up exams in an instant, and gets perfect grades on all of them.

Appearance
Mashiro's body statistics are B79/W55/H78. It has been noted many times in the series that she is very beautiful and she also has a very slim physique. She has pale skin accompanied by red eyes and long pale blonde hair that reaches her waist. She is often seen in the school uniform (which consists of a white collared short-sleeve shirt, red tie, a sky blue vest, light magenta pleated skirt with a black stripe hem, white knee-high socks, and brown dress shoes), if not, in casual clothes.

Personality
Mashiro is an excellent artist, but is extremely terrible at everything else due to lacking any common sense. She is almost completely devoid of emotion, typically wearing a blank expression and speaking in a dreary manner. Having a soft voice, Mashiro is a girl of few words, since at times, she herself is unsure of what to think, let alone say. These traits may suggest that she is autistic.

She is eccentric, as if living in her own world. As a result, she typically reacts to situations in an unconventional manner and operates on very different morals from others. For example, at times, Mashiro gives Sorata encouraging words that leave him confused instead of motivated. Mashiro can be considered an idealistic person, able to have faith in others quite easily and is quickly convinced of another's potential based on how hard that person is trying to achieve their goal.

Despite being successful at her practices, Mashiro cares little for fame or esteem. This trait allowed her to go to Japan and become a mangaka, abandoning her painting career without regret.

Mashiro can become obsessive with her work, going nights without sleep and neglecting to eat in order to complete a project. That said, Mashiro is easily motivated by food and in particular seems to be fond of baumkuchen cakes.

At times, Mashiro allows her emotions to control her actions. This tends to be the case due to lacking any otherwise logical thinking. Such as when Mashiro wanted to learn to cook to show affection towards Sorata rather than finishing up her manga chapter. To Sorata, it seemed as if she was wasting time that she could be putting into her manga for no reason, but it was really caused by her underlying love for Sorata, and her want to please him.

Trivia

 * Despite her behavior, it's never outright stated that she has a mental disorder. The closest thing her dormmates did to name her a disorder was for Sorata to call her "special", having been fed up with her antics earlier that day. Some other characters says she has issues and during valentines, even Mashiro herself says that she is not normal. For nearly all western viewers she has textbook-accurate High-Functioning Autism.
 * Mashiro" means "pure white". Not only does she have a fairer skin than the rest of the cast, it is pretty clear that Sorata even thought she is "pure to a fault".