Donkey Kong, from Mario Party Superstars
Donkey Kong (also commonly referred to as DK) is a major character in the Mario series. He is the first Mario antagonist who premiered alongside Mario (then called Jumpman) and Pauline (then called Lady in Donkey Kong on the arcade). Donkey Kong was an antagonist before Bowser existed. He later starred in the Mario series games which depicted him as a hero, though he remains a featured character in Mario spin-off games and in several Mario adventure and puzzle games, notably Mario vs. Donkey Kong, Yoshi's Island DS, and Mario vs. Donkey Kong 2: March of the Minis.