* WhatCouldHaveBeen: At some point, an official artwork showed Halo in a [[Franchise/StarWars Leia]]-like slave girl outfit, for the never released Book 4. According to Gibson, the remaining six volumes would time skip ten years in Halo's life each volume culminating in Halo reaching the end of the universe and a realm outside creation where you never age and can live forever. Halo would stay in this realm for a period of time, before ultimately returning to the known universe to die after growing bored with immortality. Creator/AlanMoore apparently showed his plan for the rest of the volumes to Creator/NeilGaiman, who described it as beautiful.