Lady Sapphire is human, yet otherworldly, or strange.
She is the voice of the girl stuck in the system who has been trying to break free for years.
She is a revised personality, an alter ego.
Lady Sapphire provides the confidence that a regular human sometimes finds hard to obtain. She is an independent somebody who is all knowledgable, unafraid, and triumphant.
Not to mention, this odd human being is exceptionally fashionable.