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Please read: If you are going to replace the current information on the Featured template, please see here before doing that and look at which order our next FAs will be put on this page. King Boo is the leader of the Boos and ghosts, the main antagonist of the Luigi's Mansion series, and the arch-nemesis of Luigi. He is also an ally of Bowser and has aided him in his various schemes. He has succeeded in capturing Mario in the Luigi's Mansion games as well as capturing Toads, Professor E. Gadd, and Princess Peach. Although not the biggest Boo, King Boo has some powers throughout the series, including materializing objects and spitting fire. King Boo's power is often directly proportional to the number of Boos in his vicinity.