Spiller is dark skinned with white stripes on both sides of his cheeks. His hair is uneven and spiky, most likely showing he doesn't cut it. His height is not determined but he is shorter than Arrietty. He is slightly muscly and has a sharp face.
He wears a brown fur coat and brown clothing underneath. He usually carries a bow along with some arrows in case danger lurks around the corner.
He’s fairly polite, not really being rude to the family he interacts with. He is especially nice to Arrietty, maybe due to him having a crush on her.