[Image: http://i242.photobucket.com/albums/ff309/Nyaruato/77-1.png]
[Image: http://i242.photobucket.com/albums/ff309/Nyaruato/44-1.png]
Like Nell, when Mashiro loses her powers/ energy, she'll revert back to her loli form.
Like Nell, when Mashiro is in her child form, she couldn't speak properly and would mess words up.
Like Nell, Mashiro is not human, but more of a spiritual style of character. Like how Nell is an Arrancar, or a former Espada, Mashiro is a special Tayutai previously known as Kikurami kami-no-hime (Deity/Goddess Kikurami).
UNLIKE Nell, when Mashiro isn't fighting, her hair would go back to the original brown tone. While in a serious battle, or perhaps a fight, her hair would turn white, which gives rise to her name "Mashiro" (Pure White). This is why you'll see her in both brown AND silver hair form:
[Image: http://i242.photobucket.com/albums/ff309/Nyaruato/54-1.png]
[Image: http://i242.photobucket.com/albums/ff309/Nyaruato/55-1.png]
I'm pretty sure there's more, but lets just stop here for now.