Charlie Brown is the most versatile, by far, member of the cast. He can by turns be a smart-aleck, a victim, a bit of a jerk, a bit stupid, sly, witty, determined or hopeful.
Patty is becoming less of a foil for Charlie Brown, and Violet is turning against him generally. Those two characters mostly exist to bounce off of CB; Schulz seems less able to think of things for them to do on their own. Shermy has even less of his own existence.
Schroeder probably has the deepest private life of all the characters. Lucy and Linus sometimes each get strips to themselves, although, strangely, not too many with just the two of them. Snoopy gets his own strip sometimes too; he hasn't made a habit of having his own thoughts yet, though, so most of the time his strips have to be pantomime which is harder to write.
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