Robinquill is a human-like Pal with a slender black body, and appears to be wearing a crested helmet and floor-length trousers, both of which are a bright spring or aquamarine green in colour. The trousers turn into a light beige as they reach the feet, and the round helmet bears a row of spikes running down the vertical middle of the head, which are further decorated with beige and orange bird feathers. It wears a collared, four-pointed, bright orange cape around its neck and shoulders; this cape is also divided down the middle.

It is similar to humans in height and stature, at about 175-180 cm (not counting the head crest). The orange eyes are the only facial feature visible on its model. Each hand ends in a thumb and two fingers.