As the Nonster world developed further amalgamations and evolutions of its creatures some ascended to the level of a god wielding unimaginable levels of power. These esoteric giants would take forms much closer to that of traditional biblical angels with features and mutations we couldn't possibly understand.
Zoid, is one of the attendants of these "Ungods" and is a more thematically condensed version of who he serves. The Ungod summons, or rather propagates these cherubs often to send a message or complete a small task not worth its full attention. So the Ungod sends Zoid, and other cherubs out to do its bidding while it tends to loftier pursuits.
Zoid exists between dimensions, capable of creating pocket-sized wormholes to travel through space spanning crazy distances in ridiculously short periods of time. Seeing Zoid is considered an omen of chaos, as it often makes decisions without thinking of consequences and this often leads to destruction or unintended mishaps as Zoid scoots through space to run more errands for its Ungod life source.
When Zoid finishes its to-do list, it returns home and gets resorbed back into the Ungod until it is needed again.
If you see Zoid buckle up, it's not mean, but it could be highly dangerous unintentionally.