Alright so basically this isn't technically his true form, it's how he looks when outside of the game.

He was born between a collision of two black holes billions of years ago, the collision was too strong that it literally ripped the fabric of spacetime apart, which also teared reality for a couple of seconds. In those seconds CR's X was born. He looks complex yet humanoid as he broke the rules of reality by his creation. More info on his backstory dropping later on

Reference sheet by the elegant 'NotSoSauronGuy'