Captain K'nuckles is a washed-up and childish old sailor who claims to be the greatest adventurer the world has ever known. Nowadays, he prefers to nap and drink maple syrup, while telling outrageous tales of past adventures and getting Flapjack wrapped up in his high seas hi-jinks. In reality, his stories are either completely false, or nowhere near as adventurous or amazing as he leads Flapjack to believe. He may not be an entirely incompetent adventurer however, as he was able to steal the Mermaid Queen's heart and successfully escape her guards in "Gone Wishin'". He is a candy addict; he will do whatever it takes to get his hands on candy. Because of this, he is incredibly selfish, putting the well-being of himself and the acquisition of candy above all else. Because of his often selfish, rude, and openly villainous behavior, K'nuckles has earned the open hostility and disrespect of nearly everybody in Stormalong, but is still respected by other pirates. Although he has a habit of taking advantage of Flapjack for his own needs, he is actually fond of him and will often attempt to get him out of trouble when a scheme of theirs goes too far. He also defends Flapjack when others try to deceive him, something that he does on a regular basis. Most of his body is composed of wood: his hands are wooden, his legs are pegs and his behind (his "sittin' muscle", as he calls it) is a wooden board. He is also made of parts stolen by other pirates. Because of his artificial body, he makes mechanical noises when he moves. K'nuckles spends most of the adventures with Flapjack trying to find Candied Island. Flapjack often has to defend him when he is in trouble. During the ending of the final episode, Thurop Van Orman portrays live-action K'nuckles.