The author of Snoopy's favorite book series, the Bunny Wunny books.
- Meaningful Name: Her name is 'Sweetstory,' and she writes a series of children's books that—judging by the excerpts shown in the strip—are sweet to the point of saccharine.
Charlie Brown's favorite baseball player, and a man who may actually be a bigger loser than Charlie Brown himself.
- The Ditz: He isn't just a bad athlete, but is totally clueless as well. For instance, when he gets hired as a manager for a minor league team, he's fired after one game for calling a squeeze play with nobody on base. When he was invited to a sports banquet, he failed to show up because he marked the wrong date, the wrong city and the wrong event in his calendar.
- Fallen-on-Hard-Times Job: After he crashes out of professional baseball, he winds up working at a car wash.
- The Klutz: He is a terrible ball player. He's known for making 'spectacular plays' on routine fly balls (implying that he's stumbling around and only barely catching really easy balls), and also for once ending a season with a .004 batting average. For context, that means he got on base once every 250 tries.
- No Sense of Direction: When invited to dinners in his honor, he gets lost and never shows up.
A woman who hates blankets and tries to get Linus to give his up, though she never quite succeeds.
- Determinator: She really does try hard to get Linus to give up his blanket. Linus, though, always manages to fend her off.
Linus's beloved teacher.
Minor characters (affiliated with Charlie Brown and Sally)
A very bossy girl with a name similar to Charlie Brown's.
- Chuck Cunningham Syndrome: She was dropped from the series a couple months after her introduction, with Lucy taking up much of her personality.
- Distaff Counterpart: Her name indicates she's one to Charlie Brown, although they don't have much in common besides that.
- Tiny Tyrannical Girl: Even more than Lucy.
A little boy that Charlie Brown meets at camp. He later attends Sally's school and sits behind her.
- All Love Is Unrequited: He has a crush on Sally, but she only has eyes for Linus.
A Hispanic girl who appears in a series of educational filmstrips, though not in the printed comic itself.
- Token Minority: The first female minority to be introduced to the strip.
A girl that Charlie Brown meets and befriends at dance lessons... or so he thinks. When he goes back for more lessons, he learns that nobody named Emily is in the class, and he's later seen dancing with no partner while thinking he's with Emily. However, in subsequent strips Emily does appear and is seen by Snoopy. Whether she truly exists or is just a figment of Charlie Brown's imagination is never fully resolved.
Another kid that Charlie Brown meets at camp.
- The Ditz: He tries to make an Indian arrowhead but is confused and winds up making a big directional arrow.
A group of little children that Charlie Brown meets when he's a fugitive from the Environmental Protection Agency (It Makes Sense in Context). Charlie Brown helps them put together a baseball team, and they actually win a game when Lucy (who has taken over Charlie Brown's team in his absence) forfeits rather than risk stepping on the kids. Leland and two others reappear a decade later asking Charlie Brown to join their new football team.
A boy who sings after Sally in a Christmas pageant, and who develops a crush on her.
A bully who cheats little kids out of their marbles. He only shows up for one arc, but is notable for being one of the only people on Earth to lose to Charlie Brown.
- The Bully: He coerces kids into playing marbles with him, then keeps all the marbles when they're done, and the kids can't fight back because he's bigger and because he won them 'legitimately.' Charlie Brown puts him in his place, though.
- Hustling the Mark: Charlie Brown calls him out on this. Agate acts like he's just looking for a friendly game with no real stakes against low-skill players, but then he plays seriously, trounces his opponents, and keeps the marbles.
A kid in a Bible study class that Sally teaches. He seems to think that The Great Gatsby is in scripture. Charlie Brown eventually learns that Larry is the minister's son.
- Cloud Cuckoolander: He's dumber than Sally, and that's saying a lot. He literally thinks that Jay Gatsby is in the Bible.
A girl scout.
- Girl Scouts Are Evil: While Loretta isn't straight-up evil, she's certainly manipulative. Charlie Brown is aggrieved to discover that, while she acted like she wanted to be his friend, she just wanted to sell him cookies.
Charlie Brown's pen(cil)-pal. Unnamed for decades, Charlie Brown finally learns her real name near the end of the strip's run.
A baseball player who claims to be the descendant of Roy Hobbs (as in The Natural). Charlie Brown does surprisingly well in baseball against her... or so he thinks.
Minor characters (affiliated with Linus)
A close friend of Linus who also hangs out with the rest of the gang. She appears in one of the TV specials, during which she is revealed to have cancer.
A girl who sits behind Linus in school and exasperates him.
- Sudden Name Change: She demands to be called by different names now and then, which exasperates Linus, who finally gives up and just calls her 'Lydia' from then on.
Another one of Linus's classmates with a crush on him. Her father is in licensing, a fact which she reminds everybody of at every opportunity.
Another of Linus's classmates. He has a slight crush on her.
- Fail O Sucky Name: She is named after truffles, a type of fungus that grows underground.
Minor characters (affiliated with Peppermint Patty)
A kid who attends camp and has a crush on Marcie.
An arrogant kid who winds up playing golf with Peppermint Patty. He also has a caddy who hits on Marcis, resulting in Marcie pushing the caddy into the lake and ending the game early.
- Upperclass Twit: His entire personality.
A talented member of Peppermint Patty's baseball team.
Marcie's cousin who is hired to tutor Peppermint Patty. Patty fires him when she learns he's being paid for it instead of doing it out of the goodness of his heart.
- Insufferable Genius: He's smart, but he's a total jerk to Patty, even starting off his first meeting with her by asking if "[she's] the dumb one."
Shirley's First Appearance: June 18, 1968 Shirley's Final Appearance: July 20, 1987
Sophie's First Appearance: June 18, 1968 Sophie's Final Appearance: August 19, 1987
Two out of three girls that Peppermint Patty mentors at camp. Sophie, in her initial story arc in 1968, was the first character to call Patty "Sir," three years before the introduction of Marcie. She also befriended Snoopy, but didn't terrorize him as Clara did.
Another member of Peppermint Patty's baseball team.
- Asshole Victim: He's eventually punched by Marcie, but almost everyone agrees he deserves it.
- Innocently Insensitive: He gets mad when Marcie joins the team, saying he doesn't want to play with a girl. This deeply offends Peppermint Patty, as she doesn't like the implication that Thibault didn't consider her a girl (since he never complained about playing with her).
- Jerk Jock: He's athletic, but he's also an arrogant, condescending bully who gets on everyone's nerves.
Minor characters (affiliated with Snoopy and his siblings)
In-universe, Amy is one of Snoopy's many admirers, and they exchange Valentine's Day and Christmas cards. Out of universe, Amy Schulz was Charles Schulz's daughter, and he would occasionally work 'happy birthday' messages into the strip for her.
- Note From Ed: Schulz wrote (unsigned) 'happy birthday' messages to Amy into the strip.
A girl who is mostly known for her attempts to keep Snoopy (and later his brother Andy) as her own dog. She does have a couple other appearances at camp, where she is mentored by Peppermint Patty along with Shirley and Sophie.
- Meganekko: In her first appearances in 1968, Clara wore glasses and looked remarkably like an early version of Marcie, albeit without opaque lenses. In future appearances she lost the glasses but gained a hair bow.
- My Beloved Smother: She acts as this to Snoopy, trying to dress him up in 'girly' outfits so he looks pretty and also keeping him chained up in the yard so he can't get into trouble.
- Never My Fault: One of her more annoying habits in the animated cartoon Snoopy, Come Home. At one point she gets distracted during a tea party and spills the tea, then blames Snoopy and threatens to spank him.
Badcall Benny Boobie's First Appearance: April 16, 1982 Badcall Benny Boobie's Final Appearance: April 30, 1982
Crybaby Boobie's First Appearance: July 5, 1978 Crybaby Boobie's Final Appearance: March 10, 1997
During doubles tennis matches, Snoopy often winds up playing against a whiny, tantrum-prone player called "Crybaby" Boobie. Boobie's partner is typically one of her brothers, either the equally-obnoxious "Badcall" Benny Boobie or the silent Bobby Boobie.
- Consummate Liar: Badcall Benny constantly lies that all of his opponents' serves are out of bounds, regardless of where they actually land.
- The Faceless: In most of Crybaby's appearances her Volumetric Mouth is so big that her face can't be seen. It's only in her very last appearance, close to two decades after she was introduced, that we actually see her face—because Snoopy kicked her hard enough to break her out of her tantrum and shut her mouth.
- The Ghost: Bobby Boobie is never depicted, though he plays tennis (offscreen) against Snoopy and Volley.
- Prone to Tears: "Crybaby" Boobie throws fits about everything.
- Volumetric Mouth: Crybaby has a big one of these, and she uses it at every opportunity.
Snoopy's original owner. She was forced to return Snoopy due to her landlord not allowing pets.
- Ill Girl: In her only appearance in the main strip, Snoopy finds her receiving treatment in a hospital.
First Appearance: May 9, 1977 Final Appearance: September 16, 1990
A short-tempered and aggressive tennis player whom Snoopy often partners with during doubles matches.
- Competition Freak: Molly Volley. She cares a lot about winning her tennis tournaments, and eventually gets so fed up with Snoopy's lack of skills that she drops him as a partner and leaves the strip entirely.
- Sore Loser: She is furious when Snoopy's screw-ups cost her a win.
- Tiny Tyrannical Girl: Molly Volley is incredibly aggressive, ordering her teammates around and flipping out whenever anything doesn't go her way.
A kind-hearted girl who finds Spike in a veterinary clinic that is operated by her mother. Naomi looks after Spike and feeds him lots of pudding, causing Spike to think about staying with her, but she does eventually return him to the desert.
- Nice Girl: A fundamentally decent person.
A girl who claims to be old friends with Snoopy—except she calls him Charlie Brown—and also claims to have no knowledge of the real Charlie Brown. The strip never explains where (if at all) she first met Snoopy or why she thinks he's called Charlie Brown.
- Mistaken Identity: She somehow mixed up Snoopy and Charlie Brown.
A girl who offended Snoopy once, but misses him and wants to see him again.