Fatso is obese and assumed to be the least intelligent, even though he is adept at singing and has a surprisingly strong knowledge of pop culture. He also has a huge appetite for food, regardless of the fact that it literally drifts through his body, constantly overeating and seems to be the most emotional. He treats Casper the same as Stretch and Stinkie, but can easily be manipulated. When Stretch and Stinkie ask about something relevant to a story, a running gag has Fatso asking about something unrelated.