Caspar is Torren's older brother and Dr. Hester's nephew. He is a roamer with no brain so he only finds things that aren't very useful, such as artificial flowers. He is obsessed with finding a special thing within the old city using a special code based on a nursery rhyme that turned out to be the City of Ember. He is shown to be a bit mad but his little brother Torren greatly respects him and wants to become a roamer with his brother. He has a baby face, except for a tiny mustache on his upper lip that twists into small points.