Marcie was first introduced as a camp attendee with Peppermint Patty in July 1971. However, she was not given a name until later that year, on October 11. The friendship between Marcie and Peppermint Patty started off unassumingly; with Marcie calling Peppermint Patty "Sir" in the very beginning, and Peppermint Patty calling Marcie a "dorky kid" in response. Over time, Marcie's character developed more fully, though she fits best as a supporting player and Peppermint Patty's best friend.
Personality and Bio
Marcie is an intellectual and a bookworm (Her most notable traits). She is well known for the high quality of her schoolwork, which provides a perfect contrast to Peppermint Patty's ineptness and has provided dozens of punchlines in the strip. She also has a talent for ice skating and music, she has taken organ lessons with Mrs. Hagemeyer (Miss Othmar's married name). Although not a hater of athletics (she admired the success of Billie Jean King, for example, and also likes caddying golf), her knowledge of sports often seems to be lacking and the rules appear to confuse her (Peppermint Patty: "There's no penalty box in baseball!").
Marcie also has a deep appreciation for the arts. In addition to her organ playing, many of the series' later gags involve her attending "Tiny Tots" concerts with Peppermint Patty, where she once again plays "straight man" to Peppermint Patty's cluelessness about the concerts themselves.
While Marcie is very smart and wise, she has sometimes shown naivete and can be goofy or a complete idiot; as seen in the TV special, It's the Easter Beagle, Charlie Brown, in which she repeatedly fails to understand the proper way to prepare Easter eggs.
When the actions of Snoopy's World War I Flying Ace alter-ego shifted from fighting the Red Baron to fighting the demons of lost love and loneliness, Marcie would act as a friend, confidant, and ultimately the "French Lass" for the flying ace on his sojourns to the Moulin Rouge.
Despite catering to Snoopy's fantasy thoughts, it is Marcie herself who finally shouts out to Peppermint Patty (after a suspenseful fight sequence) that Snoopy's doghouse is not a guest cottage and that Snoopy himself is a beagle, not "that funny looking kid with the big nose."
Such outbursts by Marcie, however, are very rare; and do not disguise the fact that she is one of the all-around sweetest, most caring, and smartest of the characters in Peanuts.