Grim Reapers

The Grim Reapers are the collectors of Souls when any mortal being dies in the Universe. There are more than one, and they are eternal and cannot be killed by any means. Heaven and Hell, along with any form of afterlife, are all perceived by what mortal beings believed the Realm of the Grim Reapers would look like. However, no one knows what or where the Grim Reapers came from, but it is believed they came into being sometime before the Universe was created. Each Solar System is assigned a Reaper, and whenever a mortal being dies in that solar system, it's Reaper absorbs their soul, and from there they are judged, and are either Reincarnated without memories of their past lives if Good, or forever a part of that Reaper if Evil.

Reapers' True forms cannot be comprehended by mortal beings, however they range from having either monstrous Alien-like forms to the Form of a Human being, they may even take the shape of a Deceased person they have collected.

While They absorb the Soul of a Mortal Being when they die, the being may be brought back via Chaos Emeralds, however, due to their soul being a part of the Reaper, should they die again, they will never come back, nor Reincarnate.

Replicas and man-made Creations such as Clones are exceptions, although when they die they cannot be brought back, Their souls cannot be collected, only recycled, and will instantly be recreated in another Reality.

Known Reapers
Only 3 Reapers are known in the Series.
 * Azazel = The Milky Way's Reaper, He takes the Form of a Teenage boy named Aeron Morte.
 * Demiurge = A Reaper Born from the Absorption of Mem Aleph, though was defeated by Anastasia Nativiallum before he could fully become one. Was Once known as Alexei Nativiallum.
 * Mem Aleph = Andromida's Reaper, Who chooses to take the form of a Attractive woman. She was Responsible for the Fall and Death of the Planet Aeternus.