Moon is the other half of Sun. Literally but also he's also the person who keeps Monty and Roxy from making sun see how high up he can fall from before he breaks something. Moon is the embodiment of "done with your shit" and "fuck around and find out". While you think he'd be against chaos it's almost the opposite because if anyone says "let's go kidnap a dog" then Moon is already in the car ready to go.