Diesel is a large and muscular T Rex. His arms resemble tree trunks and his body hair is thick and dark. His jaw is almost as big as a human's torso and covered with sharp teeth. Though he's covered with hair, his muscles are still visible under the hair. His primary body colour is blue with red stripes and his secondary colour is cream which covers his front and underside. He is 9’7” tall and 327kg heavy.