Allies

• Shock (played by Chris "Shockwave" Sullivan himself) is a short-order cook at the Electric Diner, where the Company converges when trouble occurs. Shock rarely speaks directly, instead he beatboxes and uses his hands to act out ideas. In later episodes, however, he speaks normally. He appears in some segments with Jessica, particularly the closing segment.
• P.J. Watson (played by Kyle Massey) is Keith's eccentric cousin who appeared in season 2. He starred in Lisa's movie and got help from her to write a paper from back home about an old Western story in a refrigerator.
• Leo Watson (played by L. Steven Taylor) is the proprietor of the Electric Diner and Keith's father. In Season 3, he opens up a new restaurant and passes the diner to Hector, who becomes the owner.
• The Great Calvero (played by Jason Antoon) is the local magician who performs in the park.
• Bandini is Calvero's brother, who was trapped in a painting, but the Electric Company got him out of the painting and reunited him with Calvero.
• Mario (played by Lin-Manuel Miranda) is Shock's best friend and a hip-hop MC. He makes guest appearances along with Shock in some musical segments.
• Sammy Spamboni is Manny's younger brother, who was frozen by Manny many times but gave the Electric Company advice on to how unfreeze Keith.
• Paul the Gorilla (played by Steven Freitas) was a recurring character on the original show and was the only character brought back for the new series. In the new incarnation, however, he is far more restrained and less vocal.
• Dax (played by James Miles) is a Skeleckian and a good friend of Lisa's who sometimes gets the company tied up in his issues, such as getting shrunk and having a steering wheel stolen, and almost getting some cheese stolen by the Pranksters.
• Polly Hashimoto (played by Ann Harada) is a local author whose books are found in the library. She appears in the episode "One Smart Cookie."
• Emily is a friend of Marcus Barnes who dresses as George Washington during the 4th of July celebration in one episode.
• Wiki Wiki Walter is Shock's old friend who appeared in an episode as the titular character. It is revealed that he was the one who taught Shock how to beatbox. However, after Shock beats him in a beatboxing match, he called off their relationship. They eventually reconciled near the end of the episode.
• Charles Abercrombie is the head of the Block association who camp to Sigmund's tent for petitions signed by neighbors of to remove the tent permanently because of the welcoming.
• Benny is Hector and Jessica's pet dog.
• Amy Scrambler is Annie's younger sister who Annie babysat in "He's Not Frozen, He's Immobile".
• Jules is Jessica's old friend who moved Minnehaha where they held the Hamster Olympics. She came to visit for Jessica's birthday.

The Heffenbacher Family

The following family members only appear in the second-season episode:

• Caroline (played by Deborah Rush) is Lisa's mother. When asked, she reveals the family tree of the Heffenbachers and then says to her daughter that Cordelia was a traitor.
• Mildred is Lisa's aunt. She generously allows her niece and her friends to find out about Cordelia.
• Cordelia Heffenbacher (also portrayed by Jenni Barber) is Lisa's great-great-great-great-great-great aunt. She was first mentioned by Annie Scrambler saying that she was a traitor, but Lisa proves that Annie was wrong. Cordelia distracted the British Redcoats by offering them donuts.

Allies

• Sigmund Scrambler (played by Mark Linn-Baker) is Annie's uncle, who works as a hypnotist. He is slightly bumbling, but he helps Annie in her pursuit of bothering the Electric Company.
• Sandy Scrambler (played by Ana Gasteyer) is Annie's aunt, who is a hypnotist like Sigmund Scrambler.
• Antigone Carruthers (played by Julie Halston) is Francine's mother, who is the CEO of the Antigone Carruthers Corporation. She usually calls the Electric Company the Electricians. Like Francine, she has an inflated opinion of her own importance, and her idea of punishment for Francine's misdeeds are considered incredibly lenient by the Electric Company.
• Mrs. Bebe Spamboni (played by Andréa Burns) is Manny's mother. She thinks the world of Manny like any mother would, but does never approve when he cheats.
• Sandy Rebus is Danny's dog who gave the Electric Company a note in the episode "Pies for Puppies."
• Buster Spamboni are the Spamboni's dog mentioned by Sammy telling his brother he forgot to walk him.
• Mrs. Scrambler is Annie and Amy's mother mentioned by Bebe and Amy.

The Adventures of Captain Cluck

• Captain Cluck (voiced by Isabella Palmieri) is a chicken-themed child superhero who has brown hair with high short curled pigtails, and wears a pink outfit with a matching mask and cape and also a star belt. She has the ability to correct things. In the "apostrophe-s" segment, passing ten minutes, she arranges a restaurant for all her chickens with separate plates to show whose corn belongs to.
• The Poultry Patrol are the chickens who belong to Captain Cluck. In one of the segments, they all have female names revealed with apostrophes and "s" at the end because they're hens. They are named Amy, Fay, Fran, Gin, Helen, Jan, Jen, Jean, Joan, June and Nan. Only one has not been named.
• The Lost Girl is a young black girl who only appears in the comma segment in which she is confused as she looks at her shopping list.
• Greg is a boy listening to music in headphones. He has been yelled at by his best friend.
• Farmer and Animals - He was confused on gender pronouns of his bull and cow, as well as not getting it right with his ducks, horses, pigs and sheep.
• Cheerleaders - The squad of five were very confused about the pronouns they and them.
• Baby and Mom - The Mother says the baby had a hard time understanding quotation marks.

Pets Home Alone

• Donny is a yellow canary with green wings and a matching tail. Donny likes to call all of his fur-covered friends, "Fuzzball" and plays with Nuggets' hamster ball to pretend to be an astronaut.
• Nuggets is a magenta hamster who appears in some live action backgrounds.
• Petunia is a blue bulldog. She wears a pink hairbow. She sits right next to the Green-Skinned Mummy from "Haunted House" in the live-action bench and she does never like taking baths.
• Tom is an orange cat. He is very nice and shy and knows how to use a laptop and knows the website "NachosforPets.com" and he put himself in the nachos after Nuggets rushed through the word tomatoes for Tom. He dressed as a pencil dressed as a monster for Halloween.

Haunted House

• Werewolf (voiced by Leslie Carrara-Rudolph) is a werewolf with brown fur. He lives in a haunted house with Bat and Mummy. He has a black kitten named Mr. Sprinkles who Mummy and Bat babysat.
• Bat (voiced by Leslie Carrara-Rudolph) is the only flying monster. He lives in a haunted house with Werewolf and Mummy. Bat was once given a present by a monster which turned out to be a mini-version of the monster.
• Mummy (voiced by Leslie Carrara-Rudolph) is a green-skinned mummy who wears toilet paper. He has an Indian accent. He lives in a haunted house with Bat and Werewolf. Mummy's favorite dessert is pie.
• Aunt Hildegard is a green-skinned witch with a turbo broomstick. She also has red goggles for her flight.

Others

• The Three Orangutans (voiced by Dominic Colón, Jenni Barber and Josh Segarra) demonstrate things with words that start with "gr", "fl," or "dr"; have "oo" or "ink"; or end with "mb," "ing," or "ed."
• Special Agent Jack Bowser (voiced by Tyler Bunch) is a blue android dog who wears a black sweater with a white horizontal stripe on it and is trapped in the treats/things. As he tells us that something is about to explode, he utters, "I can't crack the code to get out! Help me read this." This sketch is a parody of the TV series 24 and in fact each sketch lasts 24 seconds.
• Music Man (played by Reggie Watts) is a deep-voiced singer who appears in many segments. He is the only animated character from the first two seasons to appear in the third season since he appeared in "Wordball Games" fully animated in a different style of Flash animation and actually had spoken dialogue for the first time. His new segments involve him doing some chores for his space alien neighbor and his pesky neighbor, Pesky Eddie, or he'd get zapped and lose one life, by saying the subtitled instructions the alien stated. The segments are made in the style of a video game; where at the opening, Music Man loses his first life and only has two lives left.
• The Pet Shop Owner is a wacky pet owner who owns many unusual pets, which causes his customers to leave. His customers was a white girl, black boy, Latino boy, and Asian girl. It was also revealed his brick, pickle, and jug are alive and can move. This segment was replaced with "Pets Home Alone."
• Josephine is an African American girl who wants to sell things to the people and the mummy who live in houses.
• Felix and Oscar are an animated take-off of The Odd Couple and appear in many segments. Felix is an elderly man wearing a green shirt who makes comments and Oscar is the dim-witted, lanky, and tall teen-aged boy who lives with Felix and has to live without most of his teeth, socks, or deodorant. Although their names aren't revealed, Felix was referred to as Old Man in one episode.
• The Two-Headed Long-Necked Monster is completely female and skilled at skiing, and has light-green skin. In addition to calling each other dude, they often argue about the jacket they're wearing. One head with red eyes, lips, and antennae wants it zipped while the other head with blue eyes, lips, and antennae wants it unzipped. They both end up down the hill blaming each other and their purple hooded jacket loses its zipper.
• Wrack and Wreck are green and blue robots who love watching TV and eating bolts as a snack.
• Ray and Fay are blue monsters with horns on their heads. Ray tries to offer flowers to Fay who's sitting in a bench. She wears pigtails.

Prankster Planet

An animated segment was shown at the end of each episode starting in 2011 and 2012, respectively. Prankster Planet eventually supplanted the live show – actors were no longer employed, but Sesame Workshop continued to have Prankster Planet cartoons made. Jessica and Marcus visit the Pranksters' space base, where the Pranksters have full power to build inventions to damage words. Now without powers, Jessica and Marcus have to use their wits to turn off the inventions. Although they overcome the obstacles, the Pranksters catch up to them and prevent them from reaching the switch. The viewer is then encouraged to play an online game (now no longer available), in which you test your wits as well. The segment focuses more on measurement (in various forms) than the rest of the show. The first series of segments features Manny Spamboni's Wordsuckeruppenator which enables him to access all the words in the world. Multiple Pranksters appear to defend the off buttons. The second series of segments features Francine's Reverse-a-Ball machine, which reverses words. In this series, Francine watches Jessica and Marcus, along with a studio audience of Manny's robots. "Survey Time" is announced so the audience can vote on an obstacle for the duo, which is graphed. In the episodes alongside, three words reverse, which is shown at the end.