Mariya Shidou is a character from from Maria+Holic
When Kanako first meets Mariya, she is instantly attracted to his playful femininity and kind attitude. He often teases Kanako by playing with his long blonde hair, speaking in a soft voice, and smiling sweetly. However, Mariya turns out to be quite sadistic in nature and generally adjusts his personality to reflect whatever situation he is in. Mariya's beauty and feminine gestures are so convincing that the entire school, including the faculty, have no idea of his true sex.
Mariya is quite short, reaching at most up to the height at the tip of Kanako's nose (160 cm), and shorter than Matsurika. Because of the switching with his sister his original name was Shizu instead.
Reason For Cross-Dressing
Mariya Shidou cross-dresses to attend: Ame no Kisaki, as a girl as a means to win the chairmanship of both the all-male and all-female schools where his late grandmother served as the ex-chairman for both.
He deeply respects and loves his grandmother and does not care about actually winning chairmanship. He simply wishes to honor his grandmother's request. He appears to genuinely care about others though this facade is often hidden through some excuse he has crafted for himself.