Deity Guy is the Embodiment of Neutrality, and predates the birth of the Fictosphere.
Deity Guy was instrumental in the creation of the FIctosphere, as his tears helped catalyze the elements needed to create a multiverse and his silliness helped keep everyone within the Fictosphere from killing each other. The Embodiments then decided to keep out of the affairs of the inhabitants of the Fictosphere, considering that they made a mess of things the last time.
The promise was upheld until they appeared to Subject M in a hallucination, setting him on his quest. They did not interfere again until quite recently, meeting on a neutral plane and forcing Antwon and Baco to battle. During this meeting, Deity Guy also created his herald, Toothpaste Joe.