King K. Rool is the demented and unbalanced main antagonist of the Donkey Kong series. He is the malevolent ruler of the Kremling race (despite Klubba's statement about the Kremlings hating K. Rool because he is always abusing them), the head of the Kremling Krew who constantly terrorize the Kongs, and the archenemy of Donkey and Diddy Kong. K. Rool has repeatedly tried to steal Donkey and Diddy Kong's Banana Hoard for reasons that are not fully understood but may involve starving the primates to death and occupying DK's Treehouse (effectively making him King of the Donkey Kong Island). To reach his goal, he has even gone as far as kidnapping members of the Kong Family such as DK and Diddy.
Originally, K. Rool was a pirate on a Kremling Galleon that got wrecked in Krem Quay, that explains his accessory and piracy knowledge. K. Rool's "King" persona appears when he established his reign on Crocodile Isle itself and making himself feel powerful.