The Marvelous Misadventures of Flapjack follows a young boy named Flapjack who was raised inside Bubbie, a talking whale. After Flapjack rescues a shipwrecked crusty old pirate named Captain K'nuckles, the misadventures begin. The pair set sail in search of the magical Candied Island filled with lollipop trees and lemonade seas, but then trouble gets in the way.
Flapjack: A young child that really wants to be an adventurer. He looks up to Captain K'nuckles and often goes on adventures with him. He also often shouts ''Adventure!''
Captain K'nuckles: A blue creature that lost some of his body parts, which are now made out of wood. Flapjack found him in the sea and saved him. He loves candy and steals it from Flapjack, he even likes maple syrup.
Bubbie: A whale that saved Flapjack. Now she's Flapjack's mother and she counts as a home for Flapjack and K'nuckles. She often hates being alone while Flapjack and Captain K'nuckles are on adventures.
Peppermint Larry: A guy who owns The Candy Barrel, a place to get some candy. He even has a candy wife! He hosts an annual beard-off. Larry also hates pickles.
Candy Wife: Peppermint Larry's wife. She just sits and does nothing. She's mostly seen as a puppet animation.
Dr. Julius Barber: Dr. Barber is a doctor and a barber who runs a business that highly involves surgeries and haircuts.
Dock Hag: A hag that makes life bad for other characters.
Captain K'nuckles: Flapjack! Hey, Flapjack! Come with me, we'll go and see a place called Candied Island!
Bubbie: Who needs Candied Island? It's safer at the docks.
Captain K'nuckles: But there ain't no streams of sodie pop to go drippin' down the rocks.
Bubbie: It's dangerous and risky!
Captain K'nuckles: But adventurous and free!
Flapjack: Adventure - that's the life for me!
Captain K'nuckles: There's lollipop trees and a lemonade sea!
Bubbie: Doesn't sound very good to me.
Others: The Misadventures of...