Despite what Lucy or Violet may think of him, Charlie Brown is actually intelligent and insightful, with a somewhat above-average vocabulary (though not as high as Linus'), and is philosophical and deep-thinking; this has often led him to talk to himself about his problems, what others may be saying about him, and philosophy in general. Charlie Brown's first name 'Charles' was not revealed until March 17, 1977. That confirmed by himself in a comic strip from July 11, 1979. In 1959, Charlie Brown's sister Sally was born. Initially Charlie Brown doted on his baby sister, though she too became a thorn in his side as she grew up. Sally often pesters him for help with her homework. Charlie Brown stoically bears this, although sometimes he is able to let Sally dig her own holes without pulling him in with her while occasionally firmly putting his foot down on truly unacceptable behavior, such as lying about taking a crayon from school or reading his letters. Charlotte Braun | Clara | Shirley | Sophie | Cormac | Cat next door | Emily | Ethan | Faron | Floyd | The Goose Eggs | Janice Emmons | Joe Agate | Joe Shlabotnik | José Peterson | Lila | Little Red-Haired Girl | Mary Jo | Maynard | Mimi | Miss Othmar | Molly Volley | Charlie Brown's pen(cil) pal | Poochie | Roy | Royanne | Russell Anderson | "Shut Up and Leave Me Alone" | Tapioca Pudding | Thibault | Truffles | Snoopy's Beagle Scouts | Snoopy's siblings | Snoopy's parents | Kite-Eating Tree | Great Pumpkin | Red Baron | Easter Beagle | Harold Angel

Charlie Brown has a pen-pal but because he uses a fountain pen and because he has less skill than others at keeping the ink flow under control, he resorts to graphite and starts off the letters, "Dear Pencil-Pal". These correspondences, which began in the August 25, 1958 strip, are usually one-way; but on April 14, 1960, Charlie Brown reads Lucy a letter he has received from his pen pal. In the letter, the pen pal reveals that he or she read Charlie Brown's latest letter to his/her class and that they all agree he must be a nice person and someone who is pleasant to know. In response to which, Charlie Brown utters a vigorous "HA!" to Lucy. In a series of strips from 1994, the Pen Pal is revealed to be a girl from Scotland named Morag. Charlie Brown fantasizes about a future romance with Morag, but his plans are crushed when he learns Morag had thirty other pen pals.He is often victimized and abused by the other characters, usually getting blamed when something goes wrong even though he is obviously not the one at fault. Charlie Brown is in love with an unseen character known simply as "the Little Red-Haired Girl", though he rarely has the courage to talk to her, and when he does it always goes badly. For instance, when he finally gets the nerve to call her, he accidentally calls Marcie's house instead. It is never revealed in the comic strip whether she has any feelings towards to Charlie Brown.

Franklin and Charlie Brown are always on good terms, Franklin is seen as a good friend to Charlie Brown and is arguably the nicest person to him in the strip. The two occasionally build sandcastles together on the beach, go to Charlie Brown's house and watch movies together. Franklin was introduced building sand castles with Charlie Brown and the two remain on good terms—Franklin has an even-keeled personality and is neither a bully, a possible love interest, or a flighty daydreamer, so he provides some stability in Charlie Brown's life. However, despite this, Charlie Brown is the only person to accept "Pig-Pen" for who he is, In one strip he even defended his uncleanliness "Don't think of it as dust. Just think of it as the dirt and dust of far-off lands blowing over here and settling on 'Pig-Pen!' It staggers the imagination! He may be carrying the soil that was trod upon by Solomon or Nebuchadnezzar or Genghis Khan!" For his part, Charlie Brown is often frustrated by Sally's laziness and her reluctance to do the right thing when she finds herself in a difficult situation. His attempts to lecture Sally usually either go over her head or simply fall on deaf ears. However, Charlie Brown still always helps her, when it comes to her homework, or bullies, even though Sally rarely appreciates what he does for her. For the main articles see Marcie and Charlie Brown's relationship and Peppermint Patty and Charlie Brown's relationship Rerun and Charlie Brown appear to have little interaction with each other in strips from the 1970s and 80s. The main exception being the storyline from 1973 in which Lucy convinces a reluctant Charlie Brown to allow infant Rerun to join Charlie Brown's baseball team. Rerun is instrumental in the team's win, as he is so small that the opposing pitcher cannot throw any strikes at him, and Rerun gets a game-winning walk. However, the victory is later voided because Rerun and Snoopy had bet five cents on the game.

Thank you

Schroeder at times is usually the first to defend Charlie Brown. An example of this was when Violet offers Charlie Brown one of her leftover Valentine's Day cards on the day after the holiday. Schroeder thoroughly chastises her, however, Charlie Brown accepts the Valentine's card regardless, although he expresses appreciation for Schroeder's gesture. It is eventually revealed that the first person to have called him "Charlie Brown" was Poochie, a girl who played with Snoopy as a pup, and who first appeared in the strip on January 7, 1973. This can imply, that before this, people used to refer to him as simply Charlie.

Like all adults in the strip, Charlie Brown's parents are never seen but occasionally referenced. His father is a barber. His mother is a housewife. Peggy Jean calls him "Brownie Charles", which Charlie Brown introduced himself as such by mistake due to his nervousness during their first encounter. A song by The Coasters is called "Charlie Brown". Contrary to popular belief, this song is not an intentional reference to Peanuts. However, this is contradicted by the July 17, 1955 Sunday strip, in which Charlie Brown tells Schroeder that he does not have yellow hair, as well as by the TV special You're a Good Sport, Charlie Brown, in which he says that he does not have much hair to cut. As another irony, Brown's father is a barber—just like Schulz's father. The Little Red-Haired Girl is kissed by Charlie Brown in It's Your First Kiss, Charlie Brown. In The Peanuts Movie, she reveals that she has a liking for Charlie Brown because he is honest and caring toward others. The two even promise to write to each other.Peanuts fans, welcome to the Hot Topic Peanuts Collection, a one-of-a-kind selection of all the Peanuts merch, apparel, accessories, fan faves, gifts, and more that we're sure Charles M. Schulz would want to peruse himself. Although "Pig-Pen" is one of Charlie Brown's friends, he initially did not appreciate the cloud of dirt that follows him. While he sometimes used to reprove "Pig-Pen" for his consistent messiness, he is usually impressed by how "Pig-Pen" manages to stay messy, even in a rainstorm. In one strip, "Pig-Pen" is embarrassed when Charlie Brown deduces—simply from the dirt on his clothes—where he has been playing for the past three days. Sometimes, I lie awake at night, and I ask, 'Why me?' And then a voice says, 'Nothing personal. Your name just happened to come up." Charlie Brown is an avid kite-flyer, but his kites keep landing in a " Kite-Eating Tree" or suffering even worse fates. In one strip from 1960, he finally gets the kite to fly before it spontaneously combusts in the air. Snoopy is Charlie Brown's dog, and they have a strange but strong relationship. They seem to be able to understand each other, to the point of Charlie Brown being able to read Snoopy's mind. Despite them not being from the same species, they are still close friends, although sometimes they are annoyed at each other. Charlie Brown was the one who taught Snoopy to walk on his hind legs. Charlie Brown does many things for Snoopy, and Snoopy normally appreciates it, but sometimes he does not. They both need each other, and on many occasions are seen hugging. Since April 1969, Snoopy has been unable to remember his master's name, referring to him as "that round-headed kid." Although Snoopy is technically the Brown family's dog, no one is his master and he has a completely independent streak.

Charlie Brown gets to kiss the Little Red-Haired Girl in It's Your First Kiss, Charlie Brown. He is never able to get this close to her in the strip.A character named Charlie Brown first appeared in Charles M. Schulz's Li'l Folks comic strip on May 30, 1948, more than two years before Peanuts started publication. Schulz used the name again for one of the three characters who appeared in the first Peanuts comic strip on October 2, 1950. Charlie Brown would go on to become one of the most well-known characters in Peanuts and is considered to be the main character in the strip. According to a 1950 comic strip, his birthday is on October 30 but no strips from October 30 in subsequent years make reference to this. One on occasion the two had an argument in where Charlie Brown insulted his "yellow hair" and the fact he plays on his piano all day, Schroeder then made fun of his coonskin cap he was wearing at the time and also Charlie Brown's round head.