King Boo (Earth-2789)

"I am not afraid of you, fool! I fear only that infernal Poltergust 3000 you carry on your back! Stupid machine! But I am a KING among ghosts! I swear it... I shall fear no mere house-cleaning device!!"

- King Boo

King Boo is the leader of all ghosts and ruler of the Paranormal Dimension, as well as the arch-enemy of Luigi. He is also a frequent ally of Bowser and Doctor Neo Cortex.