Marcie ~ The only Peanuts character who wears glasses, is Peppermint Patty's best friend who also has a crush on Charlie Brown. However, she doesn't flirt with him but says it like it is...she actually flat out asked him what he thought about her. She can be brutally honest. When she gets frustrated or upset, she tends to exude violence. During one scene, Marcie got mad at Charlie Brown and kicked him in the shins. Marcie is a studious individual who does well in school and is the overachiever of the group. Of all the characters in the comic, Marcie is the one with the most parallels with Antisocial Personality Disorder. When she strikes out at others verbally and physically with charm and wit, she shows the signs of having Antisocial Personality Disorder. People who suffer from this disorder are good at putting on a mask and acting. Although Marcie's behaviors are more civil than criminal, she can still come across as violating and manipulating others' rights, especially when she is angry.
http://gypsumgirl.hubpages.com/hub/A-Psyche-Analysis-of-Charlie-Brown-and-his-Friends