Opal, often referred to as Orphan Girl, is a dream creature brought to life by Ronan Lynch. She is often said to be the female equivalent to Ronan, but seems to be distressed and scared easily.
Opal is described as very small and childlike. She wears a tattered and manky oversized fisherman's sweater and dark gray leggins (at least Blue thinks that these are leggins and not her legs) as well as a white skullcap. Her hair is fashioned into a honey blonde pixie-cut. At one point Blue notices that Opal doesn't wear boots, but has hooves instead of feet.