• Peg – The main character, together with her talking cat, Cat. She is a young girl who wears a red hat and a blue dress. She explains the situation in each episode directly to the "camera", announces when they have "a big problem", and reasons out solutions to math-related problems. During songs, she pulls out a
ukulele and plays it. She has a special blue
marble hidden under her hat. Her favorite crayon is "little bluey". She is voiced by
Hayley Faith Negrin. • Cat – An
indigo cat whose best friend is Peg. He loves circles and accompanies Peg on her adventures. Cat often inspires Peg to realize a solution to a problem without being aware of it himself. Often helps to calm Peg when she is "totally freaking out". He was inspired by Jennifer Oxley's pet cat. He is voiced by
Dwayne Hill. • Ramone – A boy who shows up to help Peg and Cat with their math problems. He is voiced by
Thamela Mpumlwana in season 1 and Jaiden Lewis in season 2. • Pig – A pig who is usually silent except when he sings in a rich operatic
tenor. His favorite shape is the triangle. Voiced by Tommy Wazelle. • Neighbor Ladies – A female African American character named Viv and a female Asian American character named Connie appear in several episodes. They often accidentally add to Peg and Cat's problems by trying to be nice. Viv is voiced by Angela Teek and Connie is voiced by
Jean Yoon. • 100 Chickens – Chickens who play and live on a farm and travel to space with Pig, Peg, and Cat. Voiced by Rob Morrison and Carys Casucci. • The Pirates and their parrot – A quarrelsome quartet of pirates who live on an island. They like to sing in four-part harmony but sing "really bad" when they get cranky. They have had a sleepover with Peg and Cat. Voiced by Rob Morrison. • Big Mouth – A blue, furry, horned space monster who likes to eat things that are little and yellow. • Richard – A
space alien from the purple planet who plays with Peg and Cat in space. He worries a lot and often cries during tense situations. Voiced by Christian DiStefano. • The Teens – Three cool older kids who love pizza and texting on their phones, but can't stand getting dirt on their clothes. Tessa (voiced by
Addison Holley) is thirteen, Mora (voiced by
Annick Obonsawin) is fourteen, and Jesse (voiced by Gabriel Giammaria) is fifteen. • Giants – Peg and Cat's big friends who live up the Beanstalk in Fairy Tale Land. In
The Giant Problem Peg and Cat think that the Giants are going to eat them. Voiced by Bryce Kulak (Giant) and Shoshana Sperling (Giantess). • Mermaid – A swimming damsel who lives in the Magical Forest. The Pig stole her Golden Pyramids in
The Golden Pyramid Problem. She is voiced by
Emilie-Claire Barlow. •
The Three Bears,
The Three Pigs,
The Three Billy Goats Gruff - Nine Friends of Peg and Cat that get into bands like The Electric Eleven. Voiced by Kevin Brathwaite (Papa Bear), Angela Teek (Mama Bear), Phatt Al (Baby Bear), and Rob Morrison (Three Little Pigs and Three Billy Goats Gruff). • The Blockettes – Five dancers that dance in the Radio City Music Hall. Voiced by Allie Hughes, Jennifer Wallis, and
Katie Griffin. • Mac – A gruff-voiced man who works various jobs in different episodes. Voiced by Kevin Del Aguila. • Peg's Mom – Voiced by Alison Jutzi. •
The Seven Dwarves - Voiced by Rob Morrison. • Dragon – A mythical creature who lives in the Magical Forest. •
Ludwig van Beethoven – A famous music composer who has problems writing music. Voiced by Rob Morrison. •
George Washington – The first president of the United States. Voiced by Kyle McDonald. •
Albert Einstein – A famous scientist. Voiced by
John Stocker. • Flat Woman – A supervillainess who likes to make things flat. Voiced by
Julie Lemieux. • Baby Fox – A young little fox who likes building his block tower and stays with Mrs. Sheep. •
Romeo and Juliet – Two young lovers from William Shakespeare's stage play of the same name. •
Triceratops - An adult blue dinosaur who talks. Randomly says "Horn!" during the conversation. • Baby
T. rex - A baby dinosaur with a voracious appetite who can't talk but instead shrieks. Seen frequently with Triceratops. •
Cleopatra - Peg + Cat's Queen of the Nile friend, along with her pet camel "Epidermis". Voiced by Patience Mpumlwana. •
Marie Curie - Voiced by
Linda Ballantyne. • Roxanne - A pink French cat. Voiced by Paula McNeil • Grandmom and Granddad - Peg's grandparents who are obsessed with the 1960s. Voiced respectfully by Judy Marshack and Jim Codrington. • The President of the United States - Voiced by
Sandra Oh. • Robin Hood - A robin loosely based on the
British folklore hero of the same name. • Aki - A ninja in training. Voiced by Mika Shimozato. •
Billie Holiday - A famous jazz singer. ==Episodes==