"Donkey Kong (ドンキーコング, Donkī Kongu) is a fictional gorilla in the Nintendo Universe. Donkey Kong first appeared in Nintendo's popular 1981 video game of the same name. Since then he has appeared in over 20 games in his own series, as well as in some games in the Mario series. He debuted at the same time as him in the original Donkey Kong game, before moving on to the more complex Donkey Kong Country platformers for the Super Nintendo. He still spars with Mario on occasion, appearing as a playable character in Mario Kart, appearing as a playable fighter in Super Smash Bros. series and the primary antagonist in the Mario vs. Donkey Kong games."
Source: Wikipedia, "Donkey_Kong_(character)", available under the CC-BY-SA License.