"Manshiro" (a nickname given by fans of the series) is the main character of the Mai-Otome and Mai-Otome Arashi manga series. The nickname Manshiro is derived from the name of Mashiro Kazahana/Mashiro Blan de Windbloom, who he impersonates. His personal name is as yet not known.

Manshiro is introduced as a meek adolescent boy who had been bullied at his previous school, a theological establishment. He had been given a chance to escape by Sergay August Taiki, the prime minister of the state of Windbloom, on the proviso that he impersonate the deceased Queen Mashiro of Windbloom. It is later revealed that he was her twin brother who was adopted by the previous king's Otome Lena Sayers and brought up as her own child and younger brother of her daughter, Arika Yumemiya, who is the first character he meets in the story.