There are some character combinations that seemed to inspire funny situations to Schulz, while some others didn't get used much. Lucy is funny with many other characters (Charlie Brown and Linus now, Snoopy and Schroeder later on). Patty is most often shown interacting with Charlie Brown or Violet. Maybe that's one of the things that led to poor Shermy's obsolescence, he doesn't have many other characters who react to him.
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