Fury Bowser

Fury Bowser is a form that Bowser takes in Super Mario 3D World + Bowser's Fury. In this form, Bowser becomes a gargantuan Kaiju, being one of the largest physical forms he has ever taken (along with Giant Bowser). Similar to Black Bowser from Paper Mario: Color Splash, Bowser's skin becomes entirely a black color with glowing yellow eyes without pupils, though in contrast, his hair glows a bright red and the tips of his shell spikes glow yellow and red. In comparison to his normal self, his body is much larger than his head, his tail is somewhat longer, and he also has noticeably larger pectoral muscles, a trait shared by his Super Smash Bros. appearances. Fury Bowser has amplified versions of his fire breath attacks. He can rain meteors across entire islands, and breathe long strings of fire at his targets.

He is seen terrorizing Lake Lapcat, and Mario, with assistance from Bowser Jr. works to take down Fury Bowser by using the power of the Giga Bell.

Trivia

 * Fury Bowser bears a resemblance to Bowser's appearance when using his Mega Strike in Mario Strikers Charged.
 * Fury Bowser and the material in his surroundings resemble, a typically dark fluid that can form spikes when influenced by a magnetic field.