Gumball's penchant for trouble offers plenty of opportunity to learn lessons, but overall he's oblivious to the repercussions of his actions and never suffers because of them. Gross-out humor is common and includes vomiting and the idea of eating food that's been chewed and spit out. The show emphasizes gender roles in the home, with the mom doing the lion's share of the housework even though she's also the breadwinner.
Characters are impervious to cartoon-style accidents like falling from the sky and landing face-first on concrete. Although it's intended to be funny, there's some slapping, punching, and kicking among siblings, and their mom responds to stress by punching through walls and breaking household objects.
Gumball's dad occasionally walks around in his underwear, which shows some of his butt when he bends over. Some storylines revolve around crushes or boyfriend/girlfriend dynamics.