Luigi's nemesis. First appeared in Luigi's Mansion (2001).
Luigi saves Mario, Peach, and all his friends from King Boo.
A Man that is beyond his own time.
Don't you wish you could be Mister King Boo?
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A big black guy named Diamond.
Guy: hey where is diamond?
Guy 2: who?
Guy 1: King Boo!!
Guy 2: Oh!! He's over there.