well he's one of bowser's henchmen.
i think he is neither, king boo is just a ghost caught between the worlds of living and dead, and he just wants to be left alone with his ghostly counterparts, and that's why he plays tricks on mario. to get him out of boo's house. you can't really say boo is a bad guy for that. they will, on occasion, play friendly sporting events as well as board games. you might say he's mario's frienemy. ill also tell you how to kill a boo one day.
The Nutcracker
drawing king boo the ghost
yes
Young L has a king boo tattoo and a chain
King George
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.
King boo's wife is Rosalina. I don't know how or why, but they are married.
becuse someboty had to have a king
no
same
king boo is. he is the same thing but with a crown.