After reading Act One in The Tempest, I found myself most interested in WHAT Ariel was.  Was it a boy, a girl, an animal? I searched for images of this creature and came across this image.  I thought it depicted my vision perfectly.  It is an it.  It is not a boy, a girl, or an animal.  It is everything.  This adds to the idea of magic.  Magic is something that is unexplainable and unnatural, much like what Ariel is.