Knunuc

Though his appearance may confuse some, Captain K'nuckles considers himself human. K'nuckles has a severe case of "whiskers," which causes his entire head to appear blue. The whiskers surrounding his mouth are ironically fake, of which he is greatly ashamed, as seen in "Beard Buddies." He also has scars and numerous tattoos, as evidenced when he is seen shirtless. He is 5'3".
K'nuckles is characterized by his long, orange nose, of which he is very fond of. He does not have any natural limbs left; they have all been replaced by crude, prosthetic wood, including the legs and hands, even his rear end is wooden, being a just a plank attached with a belt. Although he eventually reclaimed his real bottom, he lost it in the same episode, "Sittin' Muscle." K'nuckles has an odd waddle when he walks because of this and he makes squeaking noises whenever he moves.

K'nuckles lost one of his hands to a food processor at a young age, he once carved himself a new hand out of wood. Unfortunately, it was a mirror image of the one he needed; he then amputated his working hand and carved a second wooden hand. Fortunately, both prosthetic hands are in excellent working order, allowing K'nuckles to do anything a person with real hands can do (it has been said that he based them off the designs of the best-created mechanical hands ever created, although it is unknown if this is real or he just said this to boost his ego).

K'nuckles constantly wears a red pirate hat and jacket over light brown striped shirt underneath. His hat was given to him by a hatter who, when young K'nuckles asked him if he could have a hat, got one from the harbor ground with a bird nesting in it. Although the hat was covered with bird droppings, K'nuckles was still very proud of having it. He also has also been shown to wear bloomers, as "real men don't wear pants." as he has stated in "That's a Wrap!"

When his irises are seen, it is shown that he has light brown eyes. He also has black circles around his eyes. K'nuckles enjoys talking to birds. In the episode "Gone Wishin'," it has shown K'nuckles returning to his original stubble-less human form after making a wish from a mermaid's heart. It is unclear, however, if this is truly his actual normal form.
Real Captain Knuckles
Captain K'nuckles after wishing himself back to "normal"


Captain K'nuckles is not very active and prefers to spend his time sleeping in Bubbie's mouth or eating candy at the Candy Barrel (despite him and Flapjack not having enough money,). He usually likes to tell stories of his many adventures to Flapjack and, because of this, the young boy fails to see K'nuckles as the inactive good-for-nothing that he is. It is even heavily implied in many episodes that Flapjack may even be a better adventurer than K'nuckles himself due to the latter's own laziness and many lies told compared to Flapjack's own eagerness.