Jeffandrew

"Jeffandrew" is not God or Jesus (or Gary Gygax), and their name is not Jeffandrew, except to the Tres Horny Boys and Lucretia. They are one of many beings who created and maintain the worlds in which The Balance Arc (and every Tabletop RPG ever) takes place.

While Griffin states in The The Adventure Zone Zone: Balance Finale Edition that Jeffandrew was not inherently meant to be a literal self insert, they were implicitly meant to be a surrogate for all the storytellers (and by extension, GM's) in our world. Therefore, the assumption that Jeffandrew was meant to be our Dungeon Master & best friend, while unintentional, is (technically speaking) accurate. In the terms of D&D cosmology, they might be referred to as an Overgod.

Trivia

 * There is no Josta in Jeffandrew's world.
 * In contrast, it can be presumed that a game like either billiards or baseball does exist in Jeffandrew's world, as "put a little English on it" is a phrase that means curving a ball.