Peppermint Patty is a pro on the baseball diamond,
                                       but in the classroom she's a D-minus all the way.
                                       Bold, brash and tomboyish, what she lacks in
                                       common sense she makes up for in sincerity.
                                       She's the only one who calls Charlie Brown
                                       "Chuck."  Oblivious to much that goes on around
                                       her, for a long time she seemed unaware that "the
                                       funny-looking kid who plays shortstop" was a
                                       beagle.  She has trouble staying awake in class;
                                       most of her waking hours in the schoolroom are
                                       spent analyzing the probability patterns of true-false
                                       tests.

August 22, 1966
Peppermint Patty's debut on Peanuts

 

The first time she called Charlie "Chuck"/ 1966

 

Her first D minus