Mariya Mikado

Mariya Mikado (御門 まりや Mikado Mariya) is Mizuho Miyanokouji's cousin-german who grew up with him and therefore knows him very well. When it was decided that Mizuho would transfer to the all-girls school she also attends, she took it upon herself to transform him into a beautiful girl by the use of makeup, and she seemed to have a lot of fun dressing him up.

Mariya has a very spirited personality which often helps her to make sure Mizuho is acting feminine in every way: appearance, mannerisms, and even speech. This often includes using mild violence. She has difficulty in controlling her temper which sometimes causes her to do inadvisable things or carry grudges, such as her grudge against Takako, to an extreme. For most of the time that Mariya has known Mizuho, she has always been there as his support whenever he needed her, though later on in the series she finds that without her even realizing it, he has already managed to stand on his own in terms of self-confidence and maturity. Initially, she is very uneasy about this change and is unsure on how to act towards Mizuho after this revelation. She also realizes that she has developed feelings for Mizuho, something she had not consciously been unaware previously. Mariya is in the track and field club and she has been given the epithet Matsurika no Kimi.

She goes abroad to study in United States after her graduation.