Alan "The Brain" Powers: a bear. Brain is an only child. He is afraid of water (a condition commonly known as hydrophobia) and public speaking, and his greatest loves are mathematics and science. Despite his intelligence, however, he often has a tendency to think and act irrationally, and tends to overcomplicate things. Brain's real name is Alan; however, only his parents and teachers refer to him by his actual name, and even Mr. Ratburn has been known to call him Brain sometimes. Brain's parents also run an ice cream shop. Many people feel he is of African descent, but he is not because he stated in the holiday special Arthur's Perfect Christmas that althought he and his family are not African Americans they still celebrate Kwanzaa. No he didn't...
Alberto Molina: Arthur's teenaged neighbor who moved in after Mr. Sipple moved out, introduced in season 6. The Molinas are originally from Ecuador. Alberto enjoys kendo and reading "El Conejo Bionico," the Spanish version of Bionic Bunny.
Arthur Timothy Read: The title character. Arthur is an aardvark. He wears glasses, a yellow sweater, and blue jeans. Arthur has been known to fidget with his glasses at times when he's lying. There is some slight confusion as to Arthur's middle name --- it is said to be Timothy by Mrs. Read in a fourth season episode, but show/book creator Marc Brown once stated that he didn't know Arthur to have any middle name. Arthur's birthday is May 25 The character celebrated his 25th birthday on the same day in 2001.
Binky Barnes: A bulldog, Binky acts as the class bully, though he generally gets along with the other kids in his school. Part of Binky's hostility can be traced to his embarrassment at being held back a grade, as well as peer pressure from his fourth-grade friends. Although he can be brusque, Binky enjoys ballet and playing the clarinet. He has also been known to pick up litter, chase after butterflies and help out in the community. He has a peanut allergy and is also afraid of the dark. Binky is the unofficial head of a group of bullies called the Tough Customers. He somehow manages to maintain this group, despite his more recent non-bullyish tendencies. Binky and Mr. Read are voiced by the same actor.
Buster Baxter: a rabbit. Buster is Arthur's best friend and a food lover; he is a big fan of "Bionic Bunny". His parents are divorced and he lives with his mother, although he occasionally travels around the world with his father, who is a pilot. He suffers from asthma, likes to tell jokes, sometimes seems to be obsessed with aliens and stars in a spin-off series called Postcards from Buster. Buster also plays his tuba in the band. Buster had a brief leave of absence from the middle to the end of Season 2, as he went touring the world with his dad, but returned at the start of Season 3.
Catherine Frensky: a monkey. Francine's older sister. Like most teenage girls, she reads teen magazines and hogs the phone regularly. Her name is also sometimes listed as Katherine Frensky. She and Francine often clash, and Francine has been known to be jealous of Catherine or resentful that she is compared to her older sister so often.
Dora Winifred "D.W." Read: an aardvark. She's Arthur's younger sister and is often annoying; the main premise of many episodes is their perpetual sibling rivalry. Loves the television show Mary Moo Cow and the band/song "Crazy Bus". D.W. attends preschool with the Tibble twins and her best friend Emily. Unlike many young children her age these days, D.W. cannot read more than a few words. She relies on Arthur, her parents and others to read stories to her. D.W. strongly dislikes her full name, cannot stand hearing it, and insists on being referred to as "D.W." At times D.W. can out-smart Arthur and can trick him in to getting him to do things that she wants. D.W. wears a pink jumper dress and pink leg tights (in the Marc Brown Arthur books D.W.'s leg tights were white with pink stripes). D.W.'s birthday is March 1.
Emily: a rabbit. Emily attends preschool and is D.W.'s closest friend. D.W. is often jealous of Emily, because she receives a higher allowance than D.W. and has a French au pair. Emily originally had short yellow hair and a red floral-patterned dress until Season 6, when Emily returned from her vacation to France with longer yellow hair and a blue floral-patterned dress.
Fern Walters: a dog. Fern is very quiet, shy, and something of an introvert, but can be rather snappy if provoked. She is interested in poetry, mysteries (particularly Sherlock Holmes), singing, and reading the comic book adventures of ZutZut (a parody of the Tintin comics). Her mother is constantly trying to get her to become more extroverted, and even Fern herself sometimes worries she is "too quiet." She is known for her realistic story-telling, especially when telling scary stories.
Francine Alice Frensky: a monkey. Francine is a tomboy who loves sports, drumming and singing. (But she cannot do both at the same time.) Her blunt, outspoken demeanor can sometimes have a negative effect on her relationships with friends and relatives. Her family is less affluent than other families depicted in Arthur; Francine's father is a sanitation engineer and the family lives in a two bedroom apartment. They are Jewish.
George Nordgren: a moose. George's family is Swedish. In earlier episodes, he is shy and talks through the use of a ventriloquist's dummy in the form of a giraffe named Wally. He also has reading problems because of dyslexia and one time got into listening to blues music. George also has a winning streak in the periodic Lakewood Elementary School talent shows for bouncing around on a pogo stick. He helps Arthur's baseball team beat a team lead by the seemingly invincible Francine by use of strategy and observation rather than skill and power.
James MacDonald: a rabbit. Molly's little brother who attends D.W.'s preschool class. He goes unnamed until the eighth season, when D.W. is jealous of Emily's having kissed a boy and decides to pursue James romantically.
Kaitlyn "Baby Kate" Read: an aardvark. Baby Kate is Arthur and D.W.'s baby sister. She's been shown to be able to communicate with Pal and other animals in some of the episodes.
Marina Datillo: a rabbit. Prunella's best friend. She is blind and is obssesed with Henry Screever, the show's parody of Harry Potter. She and Prunella met when Prunella unwillingly received a Braille edition of the latest Henry Screever and let Marina borrow it, and since then they have become inseparable. Marina is notably good at yoga and joined Prunella and her mother, Wanda, in their early-morning yoga routine.
Mary Alice "Muffy" Crosswire: a monkey. As it happens, Muffy is Francine's best friend, though they are opposites in many ways. She is the wealthiest girl in school, the stereotypical rich/spoiled girl. She tends to be extremely self-centred, and like Francine, her behavior occasionally leads her into trouble with her friends. Muffy has a love for boy bands, opera, and shopping. Additionally, it is revealed in Arthur, It's Only Rock 'n' Roll that Muffy plays the tambourine. She also plays violin in the school band. In "The Lousy Week" episode, she is seen playing drums with mallets. Her father is the owner of a used-car dealership, Crosswire Motors -- the main source of the family's fortune. In the first season of the program, Muffy has buck teeth. These disappear in all future seasons.
Molly MacDonald: a rabbit. Molly is close friends with Binky, and is a member of a group of bullies called the Tough Customers (well, about as tough as they could get). She is known to be good at giving advice. Molly has short brown hair that completely covers her eyes. She has a little brother named James who is in D.W.'s preschool class.
Prunella: a rat. Prunella is a grade above Arthur and his friends, and as a result is somewhat snobbish and condescending towards the younger kids. She is interested in yoga and psychic and paranormal phenomena. Like Marina, she is also obssesed with Henry Screever, the show's parody of Harry Potter. She sometimes talks in a very dramatic manner.
Rubella: a rat. Prunella's older pre-teen sister. She is very spiritual and obsessed with psychic and paranormal phenomena. She is typically depicted as a mystical, and she often talks in a very dramatic tone.
Sue Ellen Armstrong: a cat. Sue Ellen is a recent transfer to Arthur's school. Her father is a diplomat, and so her family has lived in various spots around the world. She is interested in world culture, and has a black-belt in the martial arts. Because of this, Sue Ellen was the only character brave enough to intimidate Binky during the first few seasons.
Timmy Tibble: a bear. Timmy is one half of the Tibble twins, a pair of identical twins, who live with their grandmother. They often get into trouble, lending them the nickname "The Terrible Tibbles." They attend the same preschool as D.W. (In early Arthur books, the Tibble Twins are humans, but most newer books now have them as bears). Timmy wears a blue kerchief and blue pajamas.
Tommy Tibble: a bear. The other half of the Tibble twins who live with their grandmother. They often get into trouble, lending them the nickname "The Terrible Tibbles." They attend the same preschool as D.W. (In early Arthur books, the Tibble Twins are humans, but most newer books now have them as bears). Tommy wears a red kerchief and red pajamas.
Vicita Molina: Arthur's new neighbor who moved in after Mr. Sipple moved out, introduced in season 6. She's three and seven-eighths, in her own proud words, and often plays with D.W. and the Tibbles. Her family is from Ecuador.
Background characters and one-timers
Adil: Arthur's pen pal from Istanbul, Turkey. Just like Arthur, he has an "annoying" little sister and a best friend. He appears in only one episode, Dear Adil.
Aloysius Zimmerplotz: Aloysius Zimmerplotz had trouble writing his own name correctly and often runs out of room. He was mentioned briefly in the episode where D.W. and the Tibbles want to get their own library card, when Timmy compares his name to D.W.'s. After D.W. got her own library card, she questioned Aloysius if he checked out the "Hop-Along the Frog" book but Aloysius told D.W. that he checked out "Chippy the Choo Choo" instead.
Cora: Cora is the daughter of Jessica (Mrs. Read's sister) and Richard. She became the flower girl for her aunt Lucy's wedding during "D.W. Thinks Big". Cora made D.W. feel bad about not feeling important. This is the only time she has been called by name.
Jenny: Not to be mistaken as unnamed rabbit girl, she is a rabbit who wears a polka-dotted purple skirt, and has shoulder-length blonde hair. Her name is only revealed in Arthur's Reading Race.
Lisa: a rabbit. Another member in D.W.'s preschool class. One time Lisa caused D.W. to be in a very bad mood when she didn't invite her to her party.
Mike: Buster's friend. He was chosen as Buster's "older brother" on a guidance program Buster was enrolled in the episode Buster's New Friend.
Monique: She is Arthur's cousin. He gets scared of her when she comes over for a family reuinion because she practiceed martial arts on him in the past among many things. Instead, Monique wants to show Arthur her piano skills.
Rattles: Another member of the Tough Customers, in fourth grade at Lakewood. Rattles has been a Tough Customers member since the first season of the program.
Slink: One half of the two "daredevils" from Mighty Mountain, across town, introduced in the episode Buster and the Daredevils. He is a part of Binky's Tough Customers group, although seemingly he doesn't attend Lakewood Elementary. He wears a t-shirt with a lightning bolt on it. He is a rabbit-person like Molly. It was once suggested he could be her brother, but Molly is already known to have a little brother named James. He and his friend Toby (see below) once played a Beavis and Butthead parody video game called "Peabrain and Nuthead."
Steve: a rabbit. Steve is a male minor character who is normally seen in background and Buster said was "in" in the season 1 episode Buster Makes the Grade. Apparently, Steve faded further into the background in Season 2 and is rarely seen, although in the Season 7 episode "Elwood City Turns 100" Steve makes a brief speaking part while sitting in the audience watching the "Oh Elwood!" musical and in the episode Dino Dilemma when he exited the bus, he was saying the dinosaur names with Binky.
Tenzen: He lives in Tibet. He is Sue Ellen's sponsored "brother."
Thruster: A rabbit, who resembles Buster in the future. Binky sees him when he dreams in which he (Binky) ended up in the “World of Yesterday” museum exhibit instead of the “World of Tomorrow” exhibit after being asleep for 200 years. Thruster only appears once in this episode.
Toby: The other half of the two "daredevils" from Mighty Mountain across town. A one-off character introduced in the episode Buster and the Daredevils. Unlike Slink, he is not part of the Tough Customers.
Unnamed rabbit girl: She wears a blue striped shirt and has brunette hair. She does not speak throughout the show.
Mr. and Mrs. Armstrong: both are cats and are Sue Ellen's parents. Mr. Armstrong is a diplomat and Mrs. Armstrong is a homemaker with a penchant for exotic clothes.
Bailey: a dog. Muffy's chaffeur and sometimes the Crosswire Family's butler. He also has a notable talent in creating kinetic art, and follows Muffy's orders without question, even when told to drive the Crosswire limo in quite dangerous fashion.
Bitzi Baxter: a rabbit. Buster's mom, the editor of the Elwood City Times. She's overprotective of Buster and a frantic character. She dated a man named Harry who works at the newspaper for a couple seasons. Buster developed a real attachment to Harry, but Bitzi broke up with him because, although they really like each other, she wanted more time to pursue other interests.
Bo Baxter: a rabbit. Buster's father, who is divorced. He is a pilot. Buster flies with him around the United States in the spin-off Postcards from Buster series. In Postcards from Buster, he is shown with short brown hair and glasses. However, in Arthur, he looks almost exactly like Harry, Bitzi Baxter's former boyfriend.
Ms. Brian: a rabbit. The Lakewood Elementary School Art teacher
David "Nigel" Read: an aardvark. Arthur and D.W.'s father. Mr. Read runs a catering business from home and is frequently shown garnishing trays of hors d'oeuvres in the family kitchen. In some older episodes, his first name is said to be "Nigel.", creating strange inconsistencies. In the episode "D.W. Aims High," Arthur's dad hinted that he was born in 1961.
Ed Crosswire: a monkey. Muffy's father, the owner of a car dealership called "Crosswire Motors". He is the coach of the soccer team.
Dr. Frederick Fugue: a dog. Once taught Arthur piano lessons and later filled in for Ms. Krasny to take Mr. Ratburn's class to Crown City for a singing chorus field trip.
Fritz Langley: a rat. Caretaker of the Elwood City Community Garden who sometimes suffers from arthritis in his hands while working.
"Grandma" Thora Read: an aardvark. Grandma Thora is Arthur and D.W.'s paternal grandmother, who is quite caring, but tends towards being a bad cook. Grandma Thora is based on Brown's own grandmother Thora, who encouraged him by saving his childhood drawings in a bottom drawer.
"Grandpa" Dave: an aardvark. Grandpa Dave is Arthur and D.W.'s maternal grandfather. He lives on the family farm which has been in the family for 150 years.
Harry Mills: a rabbit. Works at Bitzi's newspaper as a sports writer. Bitzi started dating him for a couple of seasons, but then broke off because she wanted more time to pursue other interests.
Herbert Haney: a bear. Mr. Haney is the lovable yet absentminded principal of Arthur's school. He, like George, suffers from dyslexia.
Dr. Iris: a cat. She was the eye doctor who suggested that Arthur needed glasses in the first episode "Arthur's Eyes". (In the original Arthur book "Arthur's Eyes", Dr. Iris is a fox.)
Jane Read: an aardvark. Arthur and D.W.'s mother. Mrs. Read is a work-at-home tax accountant.
Jessica: an aardvark, Jane's sister. She is married to Richard and has a daughter, Cora. She appears in the episode "D.W. Thinks Big" for her sister Lucy's wedding.
Ms. Krasny: a bear. The Lakewood Elementary School Music teacher.
Millicent Crosswire: a monkey. Muffy's mother who likes opera.
Ramon Molina: Arthur's new neighbor. Moved into Mr. Sipple's house when he moved out in Season 6.
Mrs. Molina: Arthur's new neighbor; Ramon's wife. Moved into Mr. Sipple's house when he moved out in Season 6.
Ms. Morgan: D.W.'s preschool teacher.
Mr. Morris: a dog. Mr. Morris was the school janitor at Lakewood Elementary in Elwood City. He recently moved to Roswell, New Mexico to live with his daughter after breaking his leg during the fire at Lakewood, and is seen in Postcards from Buster when Buster visited New Mexico, yet the potental daughter isn't seen in the show. He plays the accordion nicknamed "Beatrice". Like Buster, he suffers from asthma and believes in aliens.
Nigel Emil "Charles" Ratburn III: a rat. Mr. Ratburn is Arthur and his friends' teacher and the antagonist/villian of the franchise. His passions are homework and puppetry; he also enjoys magic tricks and spent a summer working at Jack's Joke Shop. He is also knowledgeable about Japanese lutes, such as the Biwa, but is noticeably incompetent with computers. Even Prunella made a joke about Mr. Ratburn one time that he eats nails in a cereal bowl for breakfast. He is a fanatic of the show "Spooky Poo," the show's parody of Scooby Doo. The Charles part of his name comes from a strange inconsistency in the episode #50802 "Bitzi's Beau" in which his name was announced to be Mr. Nigel Charles Ratburn instead.
Oliver Frensky: a monkey. Francine's dad, who works as an sanitation engineer for the local city dump. He states he was formerly a volunteer firefighter. He is somewhat childish but optimistic in nature. He coaches the soccer team.
Paige Turner: a rabbit. Ms. Turner is the friendly but strict librarian at the Elwood City Library.
Patty Jones: a cat. The woman who played Mary Moo Cow, who later appeared as a newscaster for the T.V. show "Stock Market Today".
Mrs. Powers: a bear. Brain's mother, who owns and runs the ice cream shop. Mrs. Powers originally had brown hair for the first season, but later seasons show Mrs. Powers with yellow hair (despite evidence that Brain's family is African-American.)
Rodentia Ratburn: A rat . Mr. Ratburn's sister, who once filled in for Mr. Ratburn for a day when he was sick. Her teaching methods are notably similar to those of Mrs. Sweetwater.
Sarah MacGrady: a bear. Mrs. MacGrady is the lunch lady at Lakewood Elementary school, where Arthur and his friends study. She is full of unconventional wisdom, and is Grandma Thora's bingo buddy.
Susy Sipple: a rabbit. Arthur's odd next-door neighbor from Season 1 to 6, who enjoys barbecuing fish late at night and comes from a place where making faces on a bike means bring the biker a cabbage. He moves out in Season 6, and the Molinas move in to his home.
Miss Sweetwater: a rabbit. She is also a third grade teacher in another Lakewood Elementary School class, she mostly does fun things to her students like singing songs (such as "I Like Fudge") on her guitar. One time Miss Sweetwater had an argument in the teacher's lounge with Mr. Haney telling him "I didn't move your cheese!"
Mrs. Tibble: a marsupial-like animal. The grandmother of Tommy and Timmy Tibble. (In early Arthur books, Mrs. Tibble is a human, however many newer books has her as what she is in the TV show)
Miss Tingley: a rabbit. Principal Haney's secretary. One time she was afraid of Miss Sweetwater's singing and Mr. Haney's sawing-in-half magic trick.
Wanda: a rat. Prunella and Rubella's mother. She enjoys yoga and granola.
Wilbur Rabbit: a rabbit. The actor who plays Bionic Bunny. Wears glasses exactly like Arthur's.
Mrs. Woods: a rabbit. Perky's owner. Her grouchy dog, Perky (aka Jaws), is Pal's mother.
Boris: a goat. Ringmaster of the Elwood City kid circus.
Carl Patcheeva: a dog. Won a "combination pot holder and bath mat" gadget in 2002 in Arthur, It's Only Rock 'n' Roll.
Daniel: An Amish rabbit Buster met during a school field trip.
Uncle Fred: an aardvark. Arthur's clumsy uncle and his mother's brother, introduced in 2000 in Arthur's Perfect Christmas. It is slightly stated that he has a tendency to knock down Christmas trees.
Ranger Jackie: Ranger of Moose Mountain state park.
Ranger Ruth: Ranger for the dinosaur fossil tourist attraction where Buster once took a found fossil home from the field trip to the state park.
Sally: Arthur's one time babysitter in 2001 (later a babysitter for Buster) who is an expert in playing the video game Dark Bunny 6: Curse of the Moo Mummy. Arthur develops a brief crush on her, despite the fact that she has a boyfriend named Cory Lidle.
The President: On Arthur's and DW's trip to Washington DC, DW gets lost and meets the President of the United States in the episode DW Goes to Washington. Although it isn't stated in the episode, the President here seems to be an aardvark caricature of Bill Clinton.
Nadine: a squirrel. D.W.'s imaginary friend. Only D.W. can see her.
Snooter: a pet pig owned by Nadine that was discovered under the couch by Nadine and D.W. at one time.
Alfonz: The cat Buster rescued from a tree that made him a hero and cat saver in the episode Buster Baxter, Cat Saver.
Amigo: The Molinas' pet dog. About twice the size of Pal.
Killer: Grandma Thora's pet dog that she found as a stray.
Nemo: Francine's pet cat. Like Pal, he isn't anthropomorphized, but he's shown to be capable of communicating with Pal in a few of the episodes.
Pal: Arthur's small pet dog, who (like the other pets of the characters on the show) isn't anthropomorphized, though a series of episodes have shown him as being able to communicate with Baby Kate (and vice-versa). During these communications, Pal speaks in a tenor voice with an English accent.
Rory: Uncle Fred's pet dog. White in color, about two to three times the size of Pal. Introduced and only seen in the episode Arthur's Perfect Christmas
Spanky: D.W.'s pet budgie and a one-off character. Died in the same episode he was introduced in Season 1 episode So Long, Spanky. In the episode D.W. Tale Spins, he was mentioned, but this time exaggerated to be an eagle who died, in D.W.'s words, because his heart was too big.
Toady Wartface: D.W.'s pet toad, replaces Spanky in So Long, Spanky but never seen again until an appearance in season 7 episode The great sock mystery (in which she revealed that she escaped from D.W.), and never seen again since.
Other animals or pets whose owner is unknown
Alan Greenspaniel: A dog, and a one-off character parody of Alan Greenspan introduced in the episode The Great Sock Mystery
Bucky: A fish and one-off character that gets caught by Mr. Read in the episode D.W.'s Deer Friend, which D.W. names Bucky. It was to be the Reads' dinner, but instead ends up buried in a funeral by insistance of D.W..
General: a head louse. In many of the Lakewood Elementary students' hair. He lost his fifth leg from a comb. He likes the the smell of hairgel. Only appears the "The Lousy Week" episode
Hans: A dog. Mr. Toad's transport. Apparently a one-off character introduced in the episode The Great Sock Mystery.
Mr. Toad: A toad, and another one-off character introduced in the episode The Great Sock Mystery. He rides on a dog named Hans. Apparently, Toady Wartface knew him since they were tadpoles.
Pepe: An Italian circus flea introduced in the episode Flea to be you and me.
Salè: Another Italian circus flea, Pepe's brother. Introduced in the episode Flea to be you and me.
Spot and Dot: Two fire truck dogs mentioned in It Came From Beyond
Walter: A deer that D.W. meets in the episode D.W.'s Deer Friend. D.W. wants to take Walter home despite her parents disapproval.
Characters That Are Based on Real People
Alex Trebek (called Alex Lebek in the episode to make it not so obvious): Alex Trebek appears in the episode Arthur and the Big Riddle as the host of the Riddle Show
Art Garfunkel: Art Garfunkel appears in two Arthur episodes. He first appears in the episode The Ballad of Buster Baxter, and then later appears in Elwood City Turns 100! as one of the guests that Muffy invites to the play.
Arthur Ganson: Arthur Ganson appears in the episode Muffy's Art Attack.
Click and Clack, The Tappet Brothers (Tom and Ray Magliozzi): The Car Talk hosts appear in the episode Pick a Car, Any Car, where Arthur calls them about their car when it is about to go to the junkyard.
Edgar Renteria: Edgar Renteria also appears in The Curse of the Grebes also playing a Grebe.
Frank Gehry: Frank Gehry appears in the episode Castles in the Sky, and helps the gang create a new tree house, although they don't know he is Frank Gehry until he gives them a signed photo of the Guggenheim Museum in Bilbao.
Fred Rogers: Mr. Rogers appears on the episode Arthur Meets Mr. Rogers. He visits Arthur's house and Arthur is embarrassed because he thinks that Mr. Rogers Neighborhood is a baby show. Other people think that too. But, when Mr. Rogers comes for a visit to Arthur's class, they all change their minds when Binky says "Wow, can I have your autograph too?" to Arthur.
Jack Prelutsky: Jack Prelutsky appears on the episode I'm a Poet, as the judge of a poetry contest. At the end of the contest since he can't decide who's the winner, so he says "I hate contests. You all win."
Joshua Redman: Joshua Redman also appears in the episode My Music Rules as Francine's second-cousin-twice-removed, who they call "Uncle Josh." He gets invited by Arthur and Francine.
Koko Taylor: Koko Taylor appears in the episode Big Horns George, and is Alan "The Brain"'s favorite blues mucisian.
Larry King: Larry King appears in the "And Now a Word From Us Kids" section of the episode Elwood City Turns 100! and interviews the gang.
Michelle Kwan: Michelle Kwan appears in the episode The Good Sport, as the host of the Athlete of the Year Award at Lakewood Elementary. It is also said that she graduated from Lakewood Elementary in that series.