Nightmare is stubborn, reckless, sarcastic, and kind-hearted, often refusing help because he believes he must solve everything alone. Cross is impulsive, emotional, energetic, dramatic, and somewhat childish, acting before thinking and occasionally stealing. Error is the calmest and most rational of the group, though constantly tired and exasperated by the others' chaos. Due to severe amnesia and past trauma, he fears physical contact but slowly works to overcome it.