Long before Eric Cartman, there was another trouble-making fat kid you would be fool to match wits against: Tubby Tompkins. Writer John Stanley was genius to pit his antihero against wealthy brat Wilbur Von Snobbe. When the entitled abuse their power, everyone will root for the powerless, even a manipulative narcissist like Tubby.
For more John Stanley, I refer you to Frank M. Young's excellent blog, Stanley Stories.
Here is “The Stamp Collector” and “The Captured Flying Saucer” from Tubby # 10 (Dec 1954):