Masako Katsuki

Her real name is Masako Shiono.

A selection of other characters voiced by Masako Katsuki

Code Geass as Karen's stepmother

Gunbuster (OAV) as Reiko Kashiwara, Miko Akaiki

Gurren Lagann as Okami (ep 6)

Sailor Moon S, Super S, & Sailor Stars as Michiru Kaioh/Sailor Neptune

Inuyasha as Water Goddess

Naruto as Tsunade

Pokémon as Yamato (Cassidy)

Masako's voice is considered similar to that of Yuriko Yamaguchi's, the seiyuu for Ritsuko.