The Composer:
Yoshiya "Joshua" Kiryu

The Composer defines the entire game. Every one of the rules above, including the supernatural abilities of the Reapers, is set by the Composer. The Composer also usually assists with overseeing the game, and rectifying any issues that the lower ranks cannot deal with. This includes restoring Players to life, which only the Composer is powerful enough to do; it also includes creating the fundamental Pins used by Players and Reapers. The Composer normally only dialogs directly with the Conductor; lesser Reapers generally do not contact him. As stated in the Secret Reports, some Reapers are also incapable of perceiving him. An exceptionally skilled Reaper can rise to become Composer, although this requires the existing Composer to be defeated first, which is exceptionally difficult, but not impossible. The Composer has god-like powers in the UG, and significant power in the RG as well.