you might be wrong and here are reasons: one. we don't know how nightmare_eclipse looks, two. you don't know if they have a sister or not and if they do her age, three. we don't know either of his parents, four. if nightmare_eclipse sounds like a cool name to them then it is alright, and five. i keep saying they instead of nightmare_eclipse pronouns (or maybe they are their pronouns) because we don't know their gender