King Boo is one of the non-playable characters in LEGO Dimensions 2: The Rise of Enoch, from Nintendo's subfranchise Super Mario.
King Boo is the leader and king of the Boos, the ruler of the Paranormal Dimension, the archnemsis of Luigi and the main antagonist of the Luigi's Mansion series. He is sinister, clever, and determined. His powers include causing objects to appear out of and disappear into thin air, and control over fire, ice, and lightning attacks.
King Boo also appears in Mario Kart: Double Dash!! and Mario Kart Wii as an unlockable racer. In Double Dash!! he teams up with Petey Piranha.
Luigi's Ghostly Crisis
King Boo and his Ghost Collective eventually took over the mansion and created a machine that would summon an entire army of ghosts to take over the Nintendo Multiverse.