Whenever I happen to tune out of a conversation, I remember Charlie Brown's teacher, who's voice was heard, but her words were always muddled as if she was just a buzzing annoyance to the class. There was something so pathetic and lovable about Charlie Brown. His peers seemed to be both friends and foe.
-Woodstock - Snoopy's best friend - a yellow flightless bird with communication skills known only to Snoopy
-Snoopy - Charlie Brown's lovable, but sometimes devious dog. He was modelled after one of Schulz's childhood dogs. He is probably the most recognizable Peanuts character
-Franklin - First black character in a comic strip
-Lucy Van Pelt - I loved her evil little character traits. She was the older sister of Linus. I always loved her "Psychotherapy 5 cents" stand. Other kids had lemonade stands, but not Lucy!
-Linus Van Pelt - The meek younger brother of Lucy, never without his blanket and sucking his thumb
-Peppermint Patty - A freckle-faced tomboy neighbour who had a crush on Charlie Brown
-Sally Brown - Younger sister of Charlie Brown, who always had fabulous naturally curly hair
-Pig-Pen - The poor dirty little boy who was always surrounded by a cloud of dust
-Schroeder - The mini-grand piano playing virtuoso. He loved classical music and Beethoven. He was considered probably Charlie Brown's best friend.
There were many other minor recurring characters. Each with a bit of Schulz in them.
It seems that a lot of the cartoon characters from the 1950's were really meant to entertain adults, with a lot of adult humour and references. "The Flintstones" is a great example of that.