Unknown

Unknown (アンノウン) is an antagonist from the "Arifureta Shokugyō de Sekai Saikyō" After Story series.

He is a powerful demon from Hell.

Appearance
Unknown's body is covered in shadows with many flames that appeared like blood vessels.

Biography
Unknown killed Claudia Barenberg's parents after she summoned him when she was nine years old. It intended to possess her so that she could give birth to him and allow him to rule the world, but was stopped when members of the Vatican arrived and repelled him away.

Years later, Unknown became aware that the had mysteriously disappeared and decided to use this opportunity to take over the realm and invade Earth. He began to assemble his army by possessing many humans that either worshipped demons or were easily manipulated due to the negative emotions that they possessed. At some point, the demon became aware of the existence of the "Returnees" and wanted his subjects to eliminate them due to him considering them to be a greater threat than even the Vatican.