5. K. Rool (Donkey Kong Country series)
Whether he’s a king or a kaptain, K. Rool is the closest thing the Donkey Kong franchise has to a true villain (besides Mario, we guess). Responsible for the theft of DK’s bananas in the original Donkey Kong Country and the big gorilla’s kidnapping in Donkey Kong Country 2: Diddy’s Kong Quest, K. Rool is a massive, monstrous Kremling who proves himself a worthy foe. His crown-tossing, cannonball-throwing attacks would fit right in with the rest of the roster and offer players another heavy-hitter along the same lines as Bowser.