Pretty sure Shadow Labrys is her own character. She gets her own section on the character select screen, after all.
And if anyone's curious, Shadow Labrys' familiar-thing is Asterion/Asterius (http://en.wikipedia.org/wiki/Asterion
). Probably the Minotaur, seeing as how normal Labrys gets Ariadne, the princess who gave Theseus the ball of string that let him escape from the labyrinth after beating the Minotaur. Not to mention that that thing just looks like an evil bull, anyway.
Shadow palettes for everyone would be pretty neat.