King Boo is the leader of the Boos and the main antagonist of the Luigi's Mansion series and is the arch-enemy of Luigi. He is also an ally of Bowser, who has aided him in his various schemes. He is more than capable of devising and enacting villainous plans by himself, including his capture and imprisonment of Mario. Although not the biggest Boo, King Boo has abilities that far surpass that of the average ghost and he wields a number of impressive magical abilities, including the ability to materialize objects. King Boo's magical power is directly proportional to the number of Boos in his vicinity.
Powers and Stats
Tier: At least High 4-C, likely 4-A. Low 2-C when creating Paranormal Portals
Name: King Boo
Origin: Mario Bros
Powers and Abilities: Superhuman Physical Characteristics, Matter manipulation/creation/destruction (Created an entire mansion out of nowhere), Can attack people through mirrors, Flight, Teleportation, Intangibility, Reality Warping, Invisibility, realm manipulation/creation/destruction, Spatial Manipulation, Telekinesis, Can spawn and grow stronger when with other Boos, Can seal people into paintings, Illusion Creation, Fire Manipulation, Ice Manipulation, Water Manipulation, Lightning manipulation, Can fire ectoplasmic lasers from his crown, Can create spirit balls, Can create paranormal portals, Can create paranormal replicas of other characters like Bowser, Regeneration, Immortality (Type 7), Duplication, Shapeshifting, Size Manipulation, Forcefield Creation, Inhaling, etc.
Attack Potency: At least Large Star level+, likely Multi-Solar System level (Fought and managed to capture both Mario Bros. several times. Capable of creating and manipulating realms that contain several stars in the background). Universe level+ when creating Paranormal Portals (Paranormality from the portal will cause the universe of the Mario Bros to collapse if Luigi doesn't close it)
Lifting Strength: Superhuman
Striking Strength: At least Large Star Class+, likely Multi-Solar System Class
Durability: At least Large Star level+, likely Multi-Solar System level (Immortality and regeneration makes him hard to kill)
Stamina: Limitless due to being a ghost
Range: Extended melee range. At least Stellar, likely Interstellar with matter manipulation. Possibly universal when creating Paranormal Portals.
Standard Equipment: His crown
Intelligence: High as he leads and commands an army of Boos and other ghosts. He also planned traps and schemes.
Weaknesses: Bright light (This weakness varies as he has been shown to be capable of standing outside under the sun in several games such as Mario Kart: Double Dash)