King Boo is the leader of the race of ghosts known as Boos and the main antagonist of Luigi's Mansion. King Boo is also an ally of Bowser and has aided him in many schemes. King Boo, unlike other Boos or ghosts, he has magical abilities but it is directly proportional to the number of Boos in his vicinity.
Ever since his debut in Luigi's Mansion, King Boo has appeared in a number of Mario games, mainly spin-offs.
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King Boo
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