What makes a person who they really are?
There's a strong flavor of body horror pervading this fic, as M'gann struggles to inhabit her human form: too many fingers, bones not shaped the right way, a center of gravity that always feels off. To her, in its own way, the human body is as alien as her natural martian body is to us. Yet describing this fic simply as body horror would be selling it short. The real meat of the drama is psychological. M'gann's discomfort with the human form is a reflection of her own inner struggle with her monstrous-looking White Martian body and with what really counts towards humanity. The fic's climax works perfectly, bringing together both threads.