Nightmare had black hair, which hid one eye which was purple in color while the other, the one not covered, was teal. Nightmare had dark skin with lighter spots. He also had an excellent build; Really strong and muscular. Nightmare fought against the armies of good that were at his brother Dream's. Nightmare had a strong crew; Horror and Dust helped him fight, Killer and Cross were secret spies while Error was a sweet boy nurse who helped treat Nightmare and his crew.