Luxu is a Keyblade Master and an apprentice of the Master of Masters. He was given the role to watch over events with his Keyblade in order to allow his Master to write the Book of Prophecies, as well as to hide a mysterious Black Box.
After passing his Keyblade down to one of the five new Union leaders, Luxu cast aside his original body, allowing his heart to sojourn itself in vessel after vessel for centuries, all while keeping a close eye on his Keyblade from a distance. When a prophesied "dark seeker" arose to begin another Keyblade War, Luxu stepped in and donned the mask of his ally in order to finish his role and eventually reclaim his Keyblade when the time was right.
