Board Thread:Questions and Answers/@comment-5510795-20141122012554/@comment-9114790-20141122032957

Mafumafu is not a ryouseirui because although he can sing higher notes, his voice is not feminine. Also to my knowledge he has never sang a song in a full female voice before. There is kinda a difference between singing in a high voice and singing like a female.

For MidoriInu, I guess they would technically qualify as a ryouseirui since although their gender is unknown they can sing in both a male and female voice.