Well, Happy Cat is the only begotten son of Ceiling Cat so he can use his magic. Plus as a cat, his natural repulsion to water probably gives him the ability to keep out of it, like oil does.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'