This article contains lore created collaboratively by the Blaseball community. It is just one of many Rumors that we've found in the Interdimensional Rumor Mill. You can find more Rumors about Sandoval Crossing at their Rumor Registry.
Crossing's purported origins of being a mundane human who stumbled into the Immaterial Plane and became a blaseball player are patently false. Their moniker of "Crossing Guard" refers to their status as a psychopomp, escorting souls between realms of the living and dead, and issuing decrees to stop or start the "traffic".
In truth, Crossing is an unknowable entity - either assuming a mostly-harmless form, or restricting their influence upon the Immaterial Plane to the point they are harmless. While Crossing's intent is unknowable, in practice he is nothing but warm, helpful, and personable to fellow blaseball players, in particular his teammates on the Hellmouth Sunbeams. Crossing has seemingly-happily taken on a mentoring role within the team, often putting herself in charge of onboarding new players and gently coaching the rest of the rotation.