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• Julius Jr. (voiced by E.G. Daily) is the protagonist of the series. He is simply called "Julius" on most occasions, a young chimp and an aspiring inventor who loves to create gadgets to help his friends. He resides in "the box" where he has his own workshop. His catchphrase is "The best inventions are the ones that help your friends!" Although he is an ape, he does not find bananas delicious and instead prefers peanut butter and jelly sandwiches. He loves watermelon, called wiggly watermelon on the show. His music instrument is an electric guitar called the Box Top Guitar. His superhero alias is Captain Invention.
• Clancy (voiced by Julie Lemieux) is a short giraffe who resides in the box along with his friends. Clancy is a young teenage giraffe. Clancy is competitive and often wants to be the best at anything. But he can be a bit impatient at times. His head is larger than the rest of his body. He is world record holder on the show. He likes kumquats, called kooky kumquats on the show. His music instruments are a hammond organ, and on rare occasions a saxophone, which is only seen during the music videos at the end of episodes. His superhero alias is Giraffe Boy. He is the sidekick of Captain Invention.
• Sheree (voiced by Athena Karkanis) is a light blue raccoon who resides in the box along with her friends. Sheree is girly, and she loves to bake cupcakes and other desserts. She also loves anything sparkly, and has a great sense of fashion. Only she and Julius wear clothes. She likes cupcakes and smooshberries (a parody of many kind of berries). Her music instrument is a pink electric bass.
• Worry Bear (voiced by Benjamin Israel) is a bear who resides in the box along with Julius and his friends. He "lives up to his name", as he worries about many different things. Because of this, he often exercises caution when engaging in an activity including wearing latex gloves when his friends and him are in Icelaska. He is the only male band member to be voiced by an actor. He has a sock ape named Rocky. He likes grapefruit, called giggly grapefruit. His music instrument is a set of drums.
• Ping (voiced by Stephanie Lynn Robinson) is a squeaky-voiced panda cub who resides in "the box" along with her friends. She is very outgoing, cheerful, bubbly, giggly, and playful just like all kids and children. Unfortunately, due to her age, she is not very independent. Worry Bear is her step-cousin. She has a dance move which she kicks her knees to her chin. She likes cherries, called chew-chew cherries. Her music instrument is a tambourine.

Others

• Shaka Brah Yeti (voiced by Rob Tinkler) is a snowboarding yeti who resides in "Icelaska," which is located in "the hall of doors".
• Sylvia and Gloria (voiced by Michelle Norland-Arnis and Jadeah Lily Miller) are two caterpillars that reside in "Bugswana", which is located in "the hall of doors".
• Diamondbeard (voiced by Tysòn Blakely) is a gorilla pirate who resides on Seashelly Island (in “the hall of doors”). He has tiny diamonds embedded on his beard as his name implies. He also has a domineering mother who can be heard speaking but isn't seen. He likes sour food, but hates gruel.
• The Wandering Wardrobe is an animated closet that contains different attires for Sheree and her friends.
• Bob (voiced by John Kingston) is the giggling red beagle who operates “Twirl-a-world” which is in “the hall of doors”.
• Sharky (voiced by Emma Ordal) is Diamondbeard's nephew.
• Nadia (voiced by Mikela Fe-McClurg) is a squid who repairs machines. She enjoys working a lot even if it means very few rest times. She lives in “Enginopolis” which is in “the hall of doors”.
• Rock Sock 3000 (squeaking noises performed by Gracie Anne) is a robot resembling a larger version of Worry Bear's doll. Julius can program it for various purposes, although it also has a tendency to go haywire. At the end he always says, “Under appreciated”.
• Dez is a shy dragon with a plaid blue color. He's quite socially close to Ping. He is also the pet of Marv.
• Brewster is the rooster who runs “Sagebrush Farm” which is in “the hall of doors”. He is a regular participant of Crow-Con.
• Marv is a magician who lives in “Castledonia” located in “the hall of doors”.
• Sidney is a millipede who lives in “Bugswana”.
• Scooter is an airplane.
• Hoozy Woozies are furballs that scream “Hoozy Woozy!”
• Two Giants - They’re two giants.
• Keepin’ Time Jones - He’s a clock that says the time.
• Nova is a star that is best friends with Ping and is very sensitive.
• Squeakers is Julius’ best friend, a rubber duck he lost as a baby. He then gave it to Ping and lives next to Chachi.
• Dr. Paperwork is the imaginary foe of Captain Invention.
• Barney is the barn (his name has the word barn in it) at Sagebrush.
• Chickens that always are on the loose, and disobey Brewster.
• Rocks is Worry Bear’s rock collection.
• Martians - Aliens that live on Mars.
• Super Sock is Worry Bear’s favorite superhero. He is very forgetful on remembering his most famous adventures. His villain is Polyester. He resides in Enginopolis, which is in the “hall of doors”.

Season 1 (2013–2014)

Season 2 (2014–2015)