Nightmare: A calm, polite, and selfless guardian burdened by trauma and loneliness. Despite embodying negativity, he remains kind, avoids unnecessary conflict, and risks himself to save others while seeking revenge on Dream for betraying him.
Dream: Once compassionate, Dream was corrupted by overwhelming positivity. Now arrogant, obsessive, and manipulative, he believes he's saving others while driving them into madness, longing to become a god despite his deteriorating sanity.
They are siblings