Thugly

Thugly is the Cliff world's boss in Donkey Kong Country Returns and Donkey Kong Country Returns 3D. He appears in the level Thugly's Highrise, where he is hypnotized by Xylophone Tiki. He's presumably a sub-species or relative of Mugly because of his similar looks and attacks.

Physical description
Thugly bears a striking resemblance to Mugly, however he has hot iron plates attached to his back and is purple in color. He has a more rounded snout and sharper horns as well. He also has a black tongue instead of a pink one.

Attacks
Donkey Kong and Diddy Kong meet Thugly when they rocket up into a cave in the mountains. When they arrive they notice Thugly eating up their bananas. And suddenly, without warning, the Tiki Tak Tribe shows up, and Xylophone Tiki puts Thugly in a hypnotic trance and forces him to battle the Kongs. Thugly has several battle states. He will sprint, curling up his iron plates with each skid. When his back plates remain open, the Kongs are compelled to jump on his back. In addition, in each state, he'll dash at the duo and make boulders fall, thus soon succumbing to dizziness, and falls on his back. The Kongs must seize the opportunity to pounce on his stomach. After three hits, he will turn to orange. During this stage of the battle, he will blast streams of flame, under which the Kongs must duck. After he is hit some more, he will turn red, and spit meteorites. After Thugly's defeat, DK will wallop Xylophone Tiki, and move on with his adventure.

Trivia

 * According to the Prima Official Guide, Thugly is related to Mugly. This may be in physical appearance only.
 * In 2 player co-op mode, if Diddy Kong fires enough peanuts at Mugly or Thugly, they will retract their armor and eat the peanuts.
 * Thugly's aesthetic similarities with Mugly may reference the original Donkey Kong Country, where Really Gnawty was a palette swap of Very Gnawty, and (to a lesser extent) Master Necky Senior was a palette swap of Master Necky.