Main • Flapjack (voiced by
Thurop Van Orman) is a cheerful yet gullible orphan who was raised by Bubbie at a young age. Flapjack's biological parents are never seen or mentioned. Flapjack is naïve and oblivious to danger, and he is easily caught in dangerous situations. He holds K'nuckles in extremely high regard, with his affection for the captain sometimes bordering on obsession, although he can exhibit some anger towards K'nuckles when he lies to him. During the ending of the final episode, Thurop's son Leif plays the role of Flapjack. Flapjack's original voice actor was meant to be
Paul Reubens, but Reubens never showed up to any recording sessions, so Van Orman voiced Flapjack himself. • Captain K'nuckles (voiced by
Brian Doyle-Murray) is an old Irish sea captain. He claims to be a great adventurer, often telling Flapjack fabricated or exaggerated stories of his past experiences. K'nuckles enjoys candy and maple syrup, often valuing the acquisition of candy more than his relationships. Because of his often sociopathic behavior, K'nuckles has earned the open hostility and disrespect of nearly everybody in Stormalong. Although he often exploits Flapjack for his own needs, he is fond of him and will often attempt to get him out of trouble or make things right when a scheme of theirs goes too far. His hands, legs, and bottom are wooden prosthetics. During the ending of the final episode, Thurop Van Orman portrays live-action K'nuckles. • Bubbie (voiced by
Roz Ryan) is an
anthropomorphic whale. She is Flapjack's adoptive mother; she found him at sea in a bed of seaweed when he was a baby. Knuckles and Flapjack live inside her mouth, and she serves as their transportation as well as home. Bubbie disapproves of Flapjack's adventures, and she views K'nuckles as irresponsible, lazy, and a bad influence on him. She often allows Flapjack to go on adventures despite her wishes.
Recurring • Peppermint Larry (voiced by
Jeff Bennett) is the owner and manager of The Candy Barrel, the only place in Stormalong where adventurers can get candy besides the 99 Pence Store. Peppermint Larry is generally depicted as overly-friendly, but his friendliness is most often out of his superficial desire to attract customers and he quickly lets the mask slip when it turns that there is no money to be made. Peppermint Larry is lonely and antisocial, so much so that he creates a wife made of candy named Candy Wife, who is ambiguously inanimate and appears to be demanding and argumentative. • Doctor Julius Barber (voiced by
Steve Little) is the resident doctor and barber of Stormalong. He is also a certified "candyologist". Doctor Barber has an odd, unsettling demeanor. His driving ambition is to perform surgery on and give hair cuts to as many people as possible. His obsession with surgery leads him to always advise the simplest medical problems be addressed with a surgical procedure (much to the denizens chagrin). He leads a secretive lifestyle far outside of what Flapjack and K'nuckles know. Doctor Barber appears to live with his mother, though she resides in a dresser drawer and may simply be a voice Barber hears in his head a la
Norman Bates in the film
Psycho. Real or not, she seems to nag him about everything. He is often quoted to say, "Hmmm, yes." • Dock Hag (voiced by
Daran Norris) is the law enforcer of the Stormalong dock. She is portrayed as a fat middle-aged woman with dark brown hair. She has a crush on K'nuckles, making a doll of him out of his "dock tickets". She never shows this outside of her home, and is usually cold and bitter to everyone who comes in contact with her. She has a rotten nephew named Lawrence, who is almost as mean as she is. • Sally Syrup (voiced by
Jackie Buscarino) is a young girl who sells seashells in Stormalong Harbor whom Flapjack has a crush on. • Eight-Armed Willy (vocal effects by
Richard McGonagle) is a large
Giant Pacific octopus with a cut sticking out of his head, resembling a hole. Willy has an eye patch over his right eye due to blindness, and is shown to have terrorized Stormalong for years, as he is probably the reason for the Sea Monster Alarm. He is shown to be antagonistic, but he seems to care for Flapjack. •
The Sailors • Patch (voiced by
S. Scott Bullock) is a mustached white sailor who hangs out with Thomas. • Thomas Hatch (voiced by
Kent Osborne) is a sailor with a bad temper. He is often seen walking off-screen after being upset by someone, and the other sailors try to comfort him. • Satch (voiced by
Jeff Bennett) is a black sailor who hangs out with Thomas. • The Inventor (voiced by
Jeff Bennett) is the dastardly brother of the Professor who creates inventions to force
child labor. • Sea Urchins (voiced by Jeff Bennett and
Kevin Michael Richardson) are poor street urchin kids who demand their sea urchin back when Flapjack calls them sissies. • Lady Nicklebottoms (voiced by
Jeff Bennett) • Lord Nickelbottoms (voiced by
S. Scott Bullock) • Charles (voiced by
S. Scott Bullock) A servant that serves Lady Nickelbottom. • Lolly Poopdeck (voiced by
Steve Little) • Captain Handy (voiced by
S. Scott Bullock) • Slippery Pete (voiced by
Jeff Bennett only in Season 1 and
Greg Turkington starting Season 2) ==Production==