Who is king boo

King Boo is the king of all boos. Boos are a species of ghost in the Mario universe. King Boo is always seen wearing a crown, but sometimes it is different. King Boo is more powerful than most boos, as he can teleport and create solid matter. King Boo is just about always included in every Mario adventure. In Super Mario 64, King Boo serves as an obstacle to get a star in the ghost course. In Luigi's Mansion, King Boo is the final boss in the game and had control of Mario. For more detail on King Boo, go to the link below.