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The character King Boo does exist. You may find out more information about him by clicking here.
King Boo
KB Super Sluggahs
King Boo
Gender Male
Species / Type Boo
Eye Color Black (red in the Luigi's Mansion series)
Class Villain
First Appearance Luigi's Mansion (2001)
Latest Appearance Luigi's Mansion 6: U Are Doomed!! (2012)

King Boo is the leader and king of the Boos (hence the name) and the main antagonist of the Luigi's Mansion series. He has appeared in Luigi's Mansion, Luigi's Mansion 2, Luigi's Mansion 3: The Room of DOOM!, Luigi's Mansion 4: Haunted Dreams, and Luigi's Mansion 5: Curse of the Mansion, and Luigi's Mansion 6: U Are Doomed!!.