Nothing is certain of what God's appearance may be.
God is an primordial being that created the universe along with other primordial beings. A caring yet sincere being, He created humanity and given them the independence to make their own fate rather than controlling their fate. He does show sympathy and worries for humanity from evil forces trying to destroy what He created.
Not much was described of God, but He was the former nemesis to Nimrod. God worried of Nimrod's need for power, and the danger he will bring among His creation. He brought down a plague to make Nimrod fear His power, but Nimrod was not affected by God's power; it only made Nimrod outraged that God does not come down and face him. It is unknown if God knows of the Red Goddess or what Her intention was. But it is known that during the great flood, it buried the kingdom along with its darkest secret along with it.