Flaming Wario

Flaming Wario, originally known as Hot Wario, is a transformation in the Wario Land series. When hit by Flame (a torch-holding fox enemy), a Fire Robota, a Kaentsubo, or the flames from a Pig Head Statue or Aerodent, Wario will comically start racing around with his pants on fire. In this state, he cannot be controlled, except for jumping. Soon, the flames will spread across his entire body, making him essentially a living Fireball. He can now be fully controlled (although slowed down a bit) and can destroy Bonfire Blocks. This can be cured, obviously, by falling into water or just waiting until he burns out. Ball o' String Wario combines this ability with Snowman Wario.

In Wario Land: Shake It!, Wario can once again use this form; however, it can only be activated by coming into contact with a small fireball creature. Wario can also break Bonfire Blocks with this ability.

Trivia

 * Flaming Wario was one of three Wario transformations appearing in Densetsu no Stafy 3, along with Bubble Wario and Puffy Wario in Wario's cameo appearance in Undersea Ruins.