|Previous Occupation||Vice Captain of the 9th Squad|
|First Appearance||Anime: Episode 122|
Manga: Chapter 214
Mashiro has short, bright green hair, with hazel-colored eyes, and wears a white bodysuit with an orange scarf, boots and gloves, and also wears goggles ontop of her hair. When she was a Shinigami she wore regular Shinigami's robes with a pink scarf and glasses ontop of her head.
Mashiro is childish, easy-going, and simple-minded, often throwing fits or temper-tantrums for trivial matters. She is close friends with Hachigen, and takes a disliking to Orihime because she befriends Hachigen. Her nonchalant and often childish behavior irritates Kensei, her former captain.
Since Mashiro is a Vizard, she has the ability to use hollow powers to intensify her Shinigami abilities. Her hollow mask resembles some sort of insect, and when she wears it she gains increadible bursts of speed and strength in her legs. Her Zanpakutō's abilities are currently unknown, as Mashiro is yet to be seen in battle.
Mashiro was once the Vice Captain of Squad 9 working under Kensei Muguruma, until her and all of the other Vizards got banished to the real world for gaining hollow powers, however this was actually all Aizen's doing but the Gotei 13 did not know this at the time.