Characters featured in Martha Speaks.
The Lorraines
The main character. A talking dog.
- Afraid of Needles: Is afraid of shots, but not as much as Skits.
- Bad Liar: Whenever she tells lies, they're not very convincing. She states in "Martha's No Dummy" that it's because she's a dog, and all dogs are bad liars.
- Big Eater: Has limits, but eats a lot.
- Bilingual Animal: Martha can talk to humans thanks to her diet of alphabet soup, but she can still understand most animals.
- Berserk Button: Has several pet peeves, including baths, Nelson (formerly cats in general), squirrels, fleas, "no dogs allowed" signs, the TV shows "Mushy Duck" and "Malcolm the Monkey" and power outages.
- Breaking the Fourth Wall: During the between-episode segments, she talks to the viewer.
- Cartoon Dog Breed: She's a classic yellow cartoon mutt with brown ears. Instead of one big brown spot on her back, as many cartoon dogs have, she has a trio of smaller "freckles" on her flank.
- Does Not Like Spam: She doesn't like rhubarb pie, cream or the burgers that Big Burgertorium serve.
- Dogs Hate Squirrels: Finds squirrels annoying.
- Everyone Has Standards: Even she, a Big Eater who sometimes eats expired food, thinks the burgers at Big Burgertorium taste awful.
- Fantastic Racism: Used to have prejudice against cats, possibly due to Nelson, but it went away since meeting Kitten.
- Fear of Thunder: Is afraid of thunder, but tries to deny it.
- Filthy Fun: She likes rolling in mud, trash and dead snakes.
- Friend to All Children: She's shown to be very fond of human children (most of her human friends are kids) and puppies ("Martha's Puppy" is all about her wanting the Lorraines to adopt another puppy and trying to raise Jake as a "dog-boy" when they say no).
- Hair of Gold, Heart of Gold: Has yellow fur and is kind, loving to hang out with humans and other dogs.
- Hates Baths: She hates baths a lot, which is a plot point in "Martha Makes Scents" and "Martha Takes a Stand" but crops up a lot in other episodes.
- Heroic Dog: She's had her moments of heroism, including saving a cat and her kittens from a blizzard in "Martha's Holiday Surprise", and indirectly preventing a bug infestation in "Patrol Dog".
- Ingesting Knowledge: When she eats something that contains knowledge (like the alphabet soup), she ends up having that knowledge.
- The Klutz: Downplayed. She can be a bit clumsy sometimes, slipping on the tile floor and falling out of bed, but she's no Alice Boxwood.
- Like Brother and Sister: With Skits. They have a platonic cross-gender friendship, and Martha sometimes mentions that she sees Skits as a surrogate brother.
- Literal-Minded: Downplayed. Tends to take an expression she hasn't heard of literally. This often leads her to question why humans don't always say what they mean and their tendency to give a word different meanings.
- No Celebrities Were Harmed: Her voice sounds akin to Ellen DeGeneres, who the producers first sought to voice Martha.
- Power-Up Food: Alphabet soup makes her able to speak.
- Really Fond of Sleeping: Martha the dog really likes to take naps.
- Speaks Fluent Animal: Can speak Dog due to being, well, a dog, and she can also understand Cat, but cannot actually speak it. She can also communicate with sheep, birds and squirrels, but not monkeys.
- Talking Animal: Can talk, but is still very much a dog.
- Trademark Favorite Food: Meat and alphabet soup are her favourite foods and often show up as plot points.
- Urine Trouble: Had a habit of wetting the rug as a puppy.
Martha's ten-year-old owner.
- Animal Lover: Likes dogs, and helped convince Martha that cats aren't all bad.
- Compressed Vice: In "Helen's All Thumbs", she takes up video games but must give them up due to becoming obsessed with them and hallucinating due to them. The video game she played never affected anyone else negatively and Helen has never shown any troubles that would make her that way.
- Does Not Like Spam: She doesn't like rhubarb pie.
- Fleeting Passionate Hobbies: Takes up video games in "Helen's All Thumbs", but has to give up after getting obsessed.
- Gamer Chick: In "Helen's All Thumbs", she briefly becomes a gamer, but has to give it up after becoming obsessed and having hallucinations about the game.
- Injured Limb Episode: Has a minor sprain on her ankle in "Dog Daze" that's gone by the next day.
- Kid Detective: Sometimes she'll play a role in solving a mystery if there's a Mystery Episode. Sometimes, she dresses as "Heroic Helen", based on a character from her favourite detective series.
- Limited Wardrobe: Mainly wears black flats, hot pink tights, a hot-pink-and-orange striped skirt, and a hot pink jacket. Wears light pink pyjamas to bed.
- Obsessive Hobby Episode: "Helen's All Thumbs" has her get obsessed with gaming.
- Only Sane Woman: She sometimes plays the voice of reason to the other characters, since her friends are two dogs, a Cloudcuckoolander, a neurotic boy, an arrogant girl, a klutz, and a very young boy. For instance, she's the only one not to believe in superstition in "Martha Changes Her Luck".
- Performance Anxiety: Has a bit of stage fright, seeming apprehensive before going onstage, but not as much as Carolina.
- Pink Girl, Blue Boy: The pink girl to TD's blue boy. She wears a pink hoodie and tights while he wears a blue shirt.
- Red-Headed Heroine: Is one of the good guys and has red hair.
- Shrinking Violet: Downplayed, she's shy (having mild stage fright for instance), but not as shy as most shrinking violets.
- Sweet Tooth: Is shown enjoying ice cream and pie in several episodes.
- Why Did It Have to Be Snakes?: She's scared of ghosts.
The Lorraines' other dog.
- Afraid of Needles: He is scared of the vet due to getting shots.
- Big Eater: Again, he has his limits, but still eats a great deal.
- Big Friendly Dog: Friendly, and bigger than Martha.
- Cloud Cuckoo Lander: Is a bit of a goof, e.g. he thought the Earth had a yolk like an egg once.
- Fantastic Racism: Used to have prejudice against cats as a puppy.
- Fear of Thunder: He used to be afraid of thunder, but unlike Martha, he outgrew it in "Skits Under the Weather".
- Filthy Fun: Just like Martha, he enjoys rolling in mud and trash, although doesn't mind being bathed.
- Green-Eyed Monster: Got jealous of Martha's ability to talk in the first episode with him in it.
- Hates Baths: Downplayed. He'll find it a bit annoying being bathed, but doesn't mind it nearly as much as Martha.
- The Klutz: Due to his speed and size, he often crashes into things.
- Like Brother and Sister: With Martha. They're besties, he's a boy and she's a girl, and she's stated several times that she sees him as a surrogate brother.
- Literal-Minded: Same as Martha, he has trouble understanding idioms.
- Why Did It Have to Be Snakes?: In addition to his fear of needles, he's afraid of hockey pucks ever since chasing one got him in danger.
- Urine Trouble: Pees on Mariella's rug as a puppy.
Helen's mother.
- Birthday Episode: Her birthday happened in "Martha Runs the Store".
- Compressed Vice: In "Martha's Dirty Habit", she shows disdain for Danny's between-meal snacking, which she's never done before or since.
- Gratuitous Spanish: Sometimes puts Spanish words into her sentences.
- Happily Married: To Danny. They love each other a lot, and even when they come into conflict, they don't argue.
- In-Series Nickname: Martha calls her "Mom", even though she's clearly not her mom.
- Invisible Parents: We never find out who her parents are or were, not even when Helen draws her family tree.
- Nature Lover: Runs a garden store and is often seen gardening.
- Nice Girl: She is a very compassionate Latin woman who cares for everyone that walks past her.
- Shared Family Quirks: She and her niece Carolina both speak random Spanish occasionally, and she and her brother Jorge both cook.
- Supreme Chef: Is a pretty good cook and does most of the cooking.
Helen's dad.
- Compressed Abstinence: Tries to give up snacking in "Martha's Dirty Habit", despite having no reason to (not sick, no eating disorders, not overweight etc). Justified because he was trying to cheer Martha (who was trying to abstain from digging) up.
- Green-Eyed Monster: Was jealous of Mariella and Martha as they were both bilingual, but he wasn't.
- Happily Married: To Mariella. They love each other a lot and their only negative interaction was her frowning at him once.
- In-Series Nickname: "Danny", and Martha calls him "Dad" even though he is clearly not Martha's dad.
- Jack of All Trades: Has several jobs, including sports coach and bus driver.
Helen's little brother. His age is being described as "a few months shy of two", making him somewhere between 19 and 21 months old.
- Accidental Misnaming: When he tries to say Martha's name he often misses out the 'h' or the 't'.
- Baby See, Baby Do: He'll often copy what people say.
- Baby Talk: Cannot talk properly yet.
- Canon Foreigner: In the original books, Helen appears to be an only child.
- The Diaper Change: He gets his diaper changed offscreen several times in the series.
- In-Series Nickname: Gets called "Baby Jake" or "Jakey".
Extended Family
- Alliterative Name: Lucille Lorraine.
- Birthday Episode: Her birthday was celebrated in "Martha Says it with Flowers".
- Does Not Like Spam: She doesn't like bacon.
- Grumpy Old Woman: She sometimes complains about untidiness, or about Martha's antics.
- Happily Married: To Bernie. Even though she's grumpy, they get along very well.
- In-Series Nickname: Even Martha calls her "Grandma Lucille".
- Neat Freak: Doesn't like it when Martha sheds on the furniture.
- Plot Allergy: Revealed to have hay fever in "Martha Says it with Flowers".
- When I Was Your Age...: Talks about how "in her day", dogs didn't speak.
- Birthday Episode: His birthday was celebrated in "Martha's Worst Best Day".
- Collector of the Strange: Much like T.D., he is a pack rat and has a collection of random, unrelated items.
- Cool Old Guy: Has a playful, happy-go-lucky personality. He's also elderly.
- In-Series Nickname: Martha sometimes calls him Grandpa or Granddad despite him not being her grandfather.
- Birthday Episode: It was his birthday "Martha's Market".
- No Full Name Given: His last name, which would be Mariella's maiden name, is unknown.
- Pretentious Pronunciation: Pronounces "chocolate" as "choco-la-tay".
- Shared Family Quirks: He and his sister Mariella both cook.
- Supreme Chef: He's renowned for his recipes; he made a whole feast when he came over in "?Que Pasa, Martha?".
Helen's eleven-year-old cousin.
- Ambiguously Absent Parent: Her mother is never seen or mentioned.
- Dumb Struck: When she has stage fright, she can't even speak.
- Fantastic Racism: Not so much anymore, but she used to have prejudice against dogs.
- The Fashionista: Is serious about clothes. She often tries on new clothes and judges other people's clothes.
- Girly Girl with a Tomboy Streak: Is a fashionista, but she also plays football (though is embarrassed to admit it as she sees it as unladylike).
- Gratuitous Spanish: Sometimes randomly speaks Spanish, just like her aunt Mariella.
- Jerk with a Heart of Gold: Is a little arrogant and bossy and disses people's clothing, but has her heart in the right place (for instance, despite not keeping Lily in "Carolina Picks a Lily", she still doesn't want her to have a bad owner).
- Large Ham: Can be dramatic when she's sad or mad.
- No Full Name Given: Her and Jorge's last name is never revealed.
- Performance Anxiety: Exaggerated. Her stage fright is so intense that she goes unresponsive (while still standing and with eyes open) due to it.
- Pink Means Feminine: A fashionista in a pink shirt and shoes.
- Princess Phase: Used to pretend to be a princess when she was younger, and only outgrew it when she physically outgrew her tiara.
- Serious Business: Due to being a fashionista, she takes fashion really seriously.
- Shared Family Quirks: She and her aunt Mariella both speak random Spanish occasionally.
Friends
The Kennellys
Helen's friend.
- Afraid of Blood: Possibly. Helen once claimed he passed out when he saw Martha bleeding, though it's unknown if that was true.
- Attention Deficit... Ooh, Shiny!: Downplayed, but he's a bit easily distracted.
- Cloud Cuckoo Lander: A bit, has a vivid imagination and often thinks up crazy stuff.
- Collector of the Strange: Keeps random odds and ends at the junkyard.
- Genki Boy: He does everything with enthusiasm and the other characters are shocked when he's sad since it doesn't usually happen.
- Genius Ditz: Is a bit of a Cloudcuckoolander, but is actually a very smart kid.
- Hair of Gold, Heart of Gold: Has blond hair and is kind.
- Insane Troll Logic: He doesn't mean to troll, but his logic can be pretty weird sometimes.
- Large Ham: Likes to give it all he's got.
- Limited Wardrobe: He wears the same tomato shirt all the time.
- Literal-Minded: Has moments where he takes things literally, similar to Martha. This is probably due to his young age.
- Nice Guy: Is hardly ever rude.
- Nightmare Fetishist: Likes spooky things, the spookier the better (as he says in "Martha Gets Spooked").
- The Pollyanna: Is hardly ever sad.
- Potty Emergency: Once runs off to pee during a The More You Know segment about health and again during class in "TD and the Light Bulb of Doom".
- Shared Family Quirks: He's silly and nerdy like his father, and an energetic animal lover like his cousin.
- Speaks Fluent Animal: Averted, but he does want to be able to talk to animals in "T.D. is Talking Dog".
T.D.'s dad.
- Cloud Cuckoo Lander: Is a bit of a goofball, inventing weird things and having bizarre notions like his son.
- Gadgeteer Genius: Is an inventor.
- Genius Ditz: Goofy but at the same time highly intelligent.
- Hair of Gold, Heart of Gold: Just like his son, he's blond and kind.
- Like Father, Like Son: Both he and T.D. have blond hair and are goofy and inventive.
- Mr. Fixit: His job is doing repairs around the town.
- Nice Guy: One of the most amicable of the adults.
T.D.'s mother and the vice-principal of the school.
- Amazingly Embarrassing Parent: Embarrasses T.D., which is odd because T.D. is supposed to not get embarrassed.
- Neat Freak: Doesn't like it when O.G. and T.D. mess up the house with their inventions. She also has a Running Gag of having remind T.D to do his chores and doesn't like that T.D keeps his room a mess.
- Only Sane Woman: Tries to make sure O.G. and T.D. don't get too "out of control".
- No Full Name Given: His last name is unstated, but it's probably "Kennelly" since going by one's initials seems to be on O.G.'s side of the family, making him probably either O.G.'s brother or father.
- Retcon: Early episodes refer to him as T.D's uncle, while later episodes suddenly have him being referred to as T.D's grandfather. This change is never addressed by anyone.
- And Call Him "George": While he hasn't killed any dogs, he is a "doggie lover" (dogs' term for someone who hugs dogs too tightly) and has to learn how to behave around them.
- Birthday Episode: He's four in his first appearance and turns five in "T.D.'s Magic".
- Genki Boy: When he's not scared or sad, he's often running around and shouting gleefully.
- The Klutz: The reason why Martha's scared of him: he knocks her over when he hugs her, and squeezes her too hard.
- Mood-Swinger: Due to his young age, he goes from happy to sad and back easily.
- No Full Name Given: We don't know his last name or what his initials are for. Seeing as going by one's initials seems to be on the paternal side of T.D.'s family, his last name could be "Kennelly" if he's the son of O.G.'s brother, but he might also be the son of O.G.'s sister, which would give him a different last name.
- Noodle Incident: We don't find out too much of why he was afraid of dogs but we can guess that the last time he was this overexcited over seeing a dog, it didn't go well.
- Shared Family Quirks: Is just as excitable as his cousin.
- Shrinking Violet: He was a bit shy and scared of dogs until Martha got him to open up, which led to the above.
- Why Did It Have to Be Snakes?: Zigzagged. Before meeting Martha, he was scared of her, which causes the other kids to wonder if he's afraid of dogs in general. He gets over it quickly though.
The Boxwoods
Helen's friend.
- Animal Lover: Likes animals as much as the other kids.
- Genki Girl: Is female and energetic.
- Hair of Gold, Heart of Gold: Kind (for instance, "Alice Tells a Story" has her adopt Nelson out of pity because she thinks no one else would adopt him due to his meanness), and blonde.
- The Klutz: Is very clumsy, often tripping, dropping things, etc.
- Limited Wardrobe: Which consists of glasses, brown pants, red shoes, and a green T-shirt with a purple stripe.
- Lovable Jock: Very sporty, but not a Jerk Jock.
- Shared Family Quirks: She and her grandmother are both bad at recapping things, as shown in "Alice Tells a Story".
- Sibling Rivalry: With Ronald. They're often at odds with one another.
- Sweet Tooth: In "T.D. and the Steak Tree", she mentions getting a cavity from chewing gum too often, and in "Ice Scream", she's very passionate about ice cream.
- Tomboy: Compared to Helen, she wears pants and is athletic, while Helen wears a skirt and isn't.
Alice's teenage brother.
- Big Brother Bully: Takes pleasure out of annoying Alice, the other kids, and the dogs, too.
- The Bully: Not only annoys Alice but annoys the other children too.
- Deadpan Snarker: One of his traits which the other characters don't like is his habit of making snide remarks.
- Gadgeteer Genius: Likes computers and whatnot.
- Jerk with a Heart of Gold: Is a bit of a bully, but actually has a soft spot.
- Lean and Mean: Is an obnoxious bully and thin as a wire.
- Nerdy Bully: Gives the younger kids a hard time, and is shown liking computers.
- Pet the Dog: Secretly bought a pair of dance shoes for Alice when the latter took an interest in ballet.
- Shared Family Quirks: Shares his parents' interest in technology.
- Sibling Rivalry: With Alice. He's often teasing her.
- Unmanly Secret: Doesn't want to admit he plays with action figures.
- Gadgeteer Genius: Both very interested in technology.
- Good Parents: Seem to want what's best for both their kids.
- No Full Name Given: Neither Mr. nor Mrs. Boxwood has a known first name.
- Shared Family Quirks: They share their son's interest in technology.
- The Bully: Bullies Martha and Skits a lot.
- Cats Are Mean: Is a cat and mean. However, he's the only mean cat in the series.
- Never My Fault: Always tries to pin the blame on Martha.
- The Rival: To Martha and Skits; they're often competing against each other.
- Tuft of Head Fur: Has a large pompadour-like hairstyle for some reason.
- Uncatty Resemblance: Downplayed. He's mean like Ronald but doesn't really resemble Mr. or Mrs. Boxwood, or Alice.
- Wounded Gazelle Gambit: Pulls one in "Martha Takes the Cake" by making it look like Martha bit him in order to have her be put in the garage, then possibly frames her further somehow by leaving cake crumbs near her.
- Stock Animal Name: Her name is "Polly", which is probably the most generic parrot name in the world.
- Vitriolic Best Buds: Martha and Polly seem to get along pretty well, but Martha does sometimes insult Polly.
The Oatleys
Helen's friend.
- Ambiguously Brown: He's implied to African-American.
- Black and Nerdy: Is black, and also has an unquenchable thirst for knowledge.
- Book Worm: Reads a lot.
- Dork in a Sweater: He wears a sweater vest and is a timid bookworm.
- Green-Eyed Monster: Was jealous of the babies in the episode "Martha Plays Favourites"
- Lovable Coward: Is a bit fearful, fearing bugs and often being the most hesitant to do something.
- The Smart Guy: Is very smart, possessing a lot of general knowledge.
- Why Did It Have to Be Snakes?: He is scared of clowns, tigers, bats, and especially bugs.
- Ambiguously Brown: Has the same dark skin tone as her son, whose ethnicity is unknown.
- Friend to All Children: The reason why she runs a daycare is she likes kids.
- No Full Name Given: Her first name is unspoken.
- No Full Name Given: We don't know his first name.
The Lees
The seven-year-old best friend of Truman.
- Asian and Nerdy: Downplayed — he seems to be Asian, or at least half-Asian judging by his and his father's last name and appearance, and "Dinosaurs in Trouble" shows that he's into palaeontology.
- Genki Girl: Gender-Inverted, he's a Genki boy, being about as active as Alice.
- Lovable Coward: Is a bit nervy, but not as much as Truman.
- Missing Mom: Lives only with his dad; his mother is never metioned at all.
- Not-So-Imaginary Friend: In his debut episode "Skits and Mr. Scruffles", he meets Skits, and, because Skits can't talk, decides to name him "Mr. Scruffles" as he doesn't know the name. His dad Terrence thinks that he made Skits/Mr. Scruffles up and when Skits tells Martha about Milo (in dog), she thinks he made Milo up because he was lonely.
- Potty Emergency: Averted, but he fakes really having to pee several times in "Milo's Reading Buddy".
- Short Guy With Glasses: He is shorter than the others, and wears glasses.
- Why Did It Have to Be Snakes?: Is afraid of reading in front of others.
- Butt-Monkey: He's often shown to have bad luck — the movers keep breaking his things in "Skits and Mr. Scruffles", and he struggles to buy a pillow in "Martha's Canine Cleaners".
Neighbors
Helen's neighbour, who's a grumpy and shrewish old woman.
- Cranky Neighbour: Complains a lot and lives near the Lorraines and Oatleys.
- Fantastic Racism: Against dogs. She blames them for everything.
- Grumpy Old Woman: Is an old woman who's extremely snappy and negative.
- Hair-Trigger Temper: Is very cranky. For instance, she'll complain about lemonade being too sour, about fireworks, and about pets.
- Hypochondria: In "Nurse Martha", she's shown to often misdiagnose herself with various allergies and ailments.
- Scratchy-Voiced Senior: Has a shrill, croaky voice and is old.
- Screw Politeness, I'm a Senior!: Is very ill-mannered and elderly.
- Sweet Tooth: Likes to eat hard candy.
The animal shelter owner.
- Ambiguously Brown: Has a lighter brown skin like Carolina's.
- Animal Lover: Fits his job — he runs an animal shelter because he wants what's best for the animals.
- Comically Missing the Point: He tells Martha to bark once for one dog food and twice for the other, forgetting Martha can talk. Later, he says that he found a talking dog but he's not sure if she's that talking dog.
- Nice Guy: Very kind; he does his darnedest to help the animals.
- No Full Name Given: We don't know his last name.
- Cloud Cuckoo Lander: A bit of a clown, he sometimes rolls over.
- Cool Old Guy: Is an elderly dog and good friends with the other dogs.
- The Quiet One: Doesn't bark as much as his friends.
Mrs. Clusky
Helen, TD, and Alice's teacher.
- Brainy Brunette: A smart teacher with brown hair.
- Dork in a Sweater: An academic who wears a blue sweater.
- No Full Name Given: Her full name isn't said.
- Smart People Wear Glasses: She's a teacher and wears glasses.
Francois
Mrs. Clusky's teacup poodle.- Big Eater: Ate three whole trays of cupcakes.
- Dog Stereotype: An arrogant poodle.
- Jerk with a Heart of Gold: Naughty and demanding but he doesn't do too much of anything actively mean to the other dogs.
- Non-Standard Character Design: Compared to the other dogs on the show, Francois looks like he immigrated from Clifford the Big Red Dog.
- Ridiculously Cute Critter: Everyone but Martha and Skits think he's adorable.
- The Rival: To the other dogs, especially Martha; they're often seen at odds with each other.
- Spoiled Brat: Is a bit demanding.
Butterscotch, Mandarin and Streak
A litter of three puppies belonging to Mrs Clusky's nieces.- Edible Theme Naming: Butterscotch is a type of candy and Mandarin is a fruit.
- Odd Name Out: Streak is the only one not named after food.
- The Unintelligible: While Martha can sometimes understand them, she cannot reliably. She reckons this is due to their young age.
Mrs. Clusky's nieces
Three triplet sisters, the nieces of Mrs. Clusky and the owners of Mandarin, Streak, and Butterscotch.- No Name Given: Their names aren't stated.
- Invisible Parents: It's unknown who their parents are, other than the fact that one of them must be the sibling of Mrs. Clusky.
- Deadpan Snarker: Mr. Parkington is quite sassy.
- Lovable Coward: Mrs. Parkington has moments of nerviness and so does John.
- Mood-Swinger: John. One minute he's neurotic and the next, he's happy as can be.
- No Full Name Given: We don't know their first name.
- Nosy Neighbor: Mrs. Parkington is quite nosy, but her husband generally isn't.
- Only Sane Man: Mrs. Parkington's imagination runs away with her and John is neurotic, meaning Mr Parkington has moments of being the voice of reason.
- The Shrink: John has his own therapist.
Neighborhood Dogs
- Angry Guard Dog: Zigzags between this and Big Friendly Dog. He occasionally growls and chases everyone who comes near his property, but other times, he just wants to make friends.
- Big Friendly Dog: Zigzags between this and Angry Guard Dog. He occasionally growls and chases everyone who comes near his property, but other times, he just wants to make friends.
- Berserk Button: Do not call him a bad dog or play a high-pitched frequency near him.
- Cloud Cuckoo Lander: Martha notes he's strange because he "plays with his steaks and eats his toys".
- Extreme Omnivore: Once tried to eat his toy.
- Jerk with a Heart of Gold: Mean, but not evil.
- Motor Mouth: Barks a lot.
- Uncatty Resemblance: His owner is as much of a loudmouth as him.
- Big Friendly Dog: Is large and friendly to other dogs, people and cats.
- The Ditz: Known for being stupid; hating rain, not being able to carry sticks through doggie doors, and being unable to play catch.
- Extreme Omnivore: Eats anything from diapers to pillows to rocks. This made him sick in "The Trouble With Teddy" and he needed an operation.
- The Klutz: Bumps into things a lot.
- Sick Episode: He gets sick in "The Trouble With Teddy".
- Plot Allergy: Is allergic to his flea collar. In fact, it makes him puke.
- Big Friendly Dog: Is one of the larger dogs and friendly.
- The Eeyore: It doesn't take much to make her sad. She once got sad because her water bowl was too low.
- Sleepyhead: Likes to nap.
- Big Friendly Dog: A sociable, easy-going Alsatian.
Antagonists
Two con men, who are almost always trying to steal Martha
- Bald of Evil: Weaselgraft is a bald villain.
- Con Man: Both like to scam people.
- The Dragon: Pablum seems to be Weaselgraft's sidekick.
- Fat and Skinny: Pablum is thin while Weaselgraft is tubby and they're often together.
- Fat Bastard: Weaselgraft is a large, greedy conman.
- Greed: Most of their evil is done to make a profit.
- Last-Name Basis: Both are generally addressed by last name.
- Lean and Mean: Pablum is a scrawny conman.
- Labcoat of Science and Medicine: Pablum, the scientist, wears a lab coat.
- No Full Name Given: We don't know Pablum's first name.
- Still Believes in Santa: In one episode, somebody phones up Dr. Pablum and Otis Weaselgraft, who have Martha captive, pretending to be Santa. Despite being grown men and Dr. Pablum being a scientist, the two only get suspicious when they realise that they'd be on the Naughty List.
- Ambiguously Jewish: His last name, Steinglass, is common among Ashkenazi Jews.
- Dork in a Sweater: Wears a sweater vest and says big words.
- Jewish and Nerdy: Implied. He says big words and his last name makes him Ambiguously Jewish.
- Lean and Mean: Like Ronald, he's skinny and likes messing with the younger kids.
- Nerdy Bully: He uses big words and likes to bother the younger kids.
- Sesquipedalian Loquaciousness: Likes to use big words.
- Meaningful Name: He yells a lot and chases Martha away.
- Neat Freak: Makes a big deal over even a hair out of place.
- No Full Name Given: We don't know his first name.
Other
- Greed: In "Martha Blah Blah", she lays off employees to make money.
- No Full Name Given: Her last name is unsaid.
- Scratchy-Voiced Senior: She has a high, croaky voice.
- When I Was Your Age...: Mentions how in her childhood, alphabet soup didn't have the entire alphabet.
- Added Alliterative Appeal: His nickname Junkyard Joe.
- Green Aesop: He likes to invoke this trope by teaching people about garbage.
- In-Series Nickname: Junkyard Joe is his main nickname.
- No Full Name Given: His last name is unrevealed.
- Alliterative Name: Three "C"s.
- Broken Pedestal: Becomes this briefly in "Starstruck Martha" by the human fans when they find out his fear of flowers. They also hate him further when they don't fall for a fake bear scheme planned by Martha, Truman and Helen. Fortunately, he becomes a Rebuilt Pedestal after planning a scheme with a real bear named Bobo.
- The Danza: In-Universe. His name is "Carlo", which is the same name is his character.
- Lovable Coward: On TV he is brave, but he is actually timid.
- Plot Allergy: He has hay fever, which led to him causing a mishap by sneezing.
- Why Did It Have to Be Snakes?: He's afraid of flowers due to an incident.
- The Bus Came Back: Returns later on the series to teach Martha how to become a cat in a play.
- Cute Kitten: Is a very sweet little kitten.
- A Dog Named "Dog": A kitten named Kitten.
- Morality Pet: Literally, as he is a pet and he helped Martha realise that Cats Are Mean does not always apply.
- Ridiculously Cute Critter: His role is to be cute.
- Gentle Giant: He is a big elephant who is sweet and bashful.
- Shrinking Violet: Is a bit shy.
- Einstein Hair: He is a really smart monkey with a hairstyle reminiscent of Albert Einstein.
- Formally-Named Pet: A pet monkey named Professor.
- Half-Dressed Cartoon Animal: Wears only a lab coat.
- Labcoat of Science and Medicine: A genius monkey in a lab coat.
- Species Surname: Doesn't have a first name, but his title is "Professor" and his surname is "Monkey".
- No Full Name Given: We don't know what her last name is.
- Satellite Character: Usually seen in episodes with Professor Monkey.
- Punny Name: A weather lady with "wind" and "cloud" in her name.
- No Full Name Given: We don't know his first name.
- Blind Without 'Em: Seems to be either very nearsighted or has an astigmatism, since he can barely see and is prone to making Blind Mistakes without his glasses.
- Talk Like a Pirate: He is an old sailor who talks as if he were a pirate.
- Animal Gender-Bender: Is a female duck, as revealed in "The Return of Ralph", but has a green head like a drake.
- Gender-Blender Name: Is actually female despite her name.
- Nearly Normal Animal: Is a relatively normal duck, but she quacks to a tune once.
- Shared Family Quirks: She and her kids all like to watch TV.
- Your Tomcat Is Pregnant: Was thought to be male at first, but later revealed to be female when she laid eggs.