A "seiyuu" is a voice actor or actress for anime characters. Sailorneptune's seiyuu is Katsuki Masako. Unfortunately, for Katsuki, not much is known about her, but there is little information. Her maiden name is Shiono Masako, and she was born on October 15th, 1959 in Aomori, Japan. She works for 81 Produce and if you are obsessed, her blood type is A. She has been casted for over fifty roles in various animes. If you would like a list, please click here. To me, Katsuki was the perfect seiyuu for Michiru, for Michiru was a reserved and very mature woman. Of course, she would not have stood out if it weren't for the duo team of both Katsuki and Sailoruranus' seiyuu, Megumi Ogata.