Fire Koopa

Fire Bowser is a transformation used by King Bowser Koopa in The Adventures of Super Mario Bros. 3 episode "Super Koopa".

Through the use of a powerful pendant, Bowser gained the ability to use Power-Ups, including gaining a fire-based powers, even without the use of a Fire Flower.

As Fire Bowser, Bowser would turn bright orange in color and gain the ability to blast balls of fire from his palms to injure others.

Bowser eventually lost the ability to transform into Fire Bowser after his pendant overloaded and exploded due to being used too much.

Trivia

 * In the opening cinema of the Super Mario World animated series, Bowser is shown to conjure a fireball in the palm of his claw and throw, despite not being Fire Bowser.