King Boo (Super Mario Sunshine)

During the events of Super Mario Sunshine, Bowser and his forces attacked the vacation paradise of Isle Delfino, home of the Piantas. King Boo and his Boo minions occupied Hotel Delfino, the four-star resort located on Sirena Beach. It is revealed in this game that he hates spicy things.

While Bowser Jr., in the guise of Shadow Mario, tarnished the real Mario's good name, King Boo settled into his new house of haunts. The Boo leader and his forces even managed to capture a few Shine Sprites, the source of Isle Delfino's energy. In fact, King Boo personally guarded one of these Shine Sprites.

As his Boo minions roamed the halls of the hotel, King Boo decided to make his lair inside a secret area of the hotel's casino. Ultimately, King Boo's control over the hotel would not last long. Mario, armed with his new accessory F.L.U.D.D, fought past King Boo's forces and discovered the entrance to the ghost leader's hidden lair. To enter the secret area, Mario had to Ground Pound the purple space on the giant roulette in the center of the casino. This transported the heroic plumber to King Boo's arena, where the two engaged in combat.

The battle took place on top of yet another giant roulette. During the fight, King Boo would attack Mario by spitting normal Boos to do their master's dirty work. The ghoul would also spit bubbles at the plumber, although Mario could simply pop these to refill F.L.U.D.D's water tank. However, the ghastly leader would also spice up the battle by taking out a large slot machine. When Mario sprayed the slot machine while King Boo was holding the device, the reels would begin to spin. If three question marks lined up, enemies would appear out of nowhere and instantly attack the heroic plumber. If three coins appeared on the reels, Mario would be rewarded with coins (and could thus refill his health meter). Finally, if three fruits lined up on the reels, a heaping amount of fruit would appear on the roulette battlefield. Noticing King Boo's large, drooling tongue hanging out, Mario decided to pick up a red pepper (when available) and tossed the spicy fruit into the massive tongue. This would set the ghost royal's mouth ablaze, immobilizing the large Boo as he attempted to put out the fire. Mario could then toss another fruit directly at King Boo to deliver damage to the ghost. However, if Mario sprayed King Boo instead of hitting him with a fruit, F.L.U.D.D's water would cool the ghost's tongue and the Boo leader would suffer no damage. After repeating the process of red pepper attack followed by a fruit strike three times, Mario defeated the King of the Boos and collected the ghost's personal Shine Sprite. Once defeated, King Boo exploded. With more energy returning to the island, Mario continued to collect more Shine Sprites, and eventually defeated both Bowser and his son Bowser Jr.