The story would follow a man reborn as king boo with all the powers, in whatever world
King boo is honestly really powerful, his powers including
Super strength
High intelligence
Dark magic manipulation
Flight
Teleportation
Can enter and leave Paintings at will
Conjuring anything
Pyrokinesis
Power enhancement
Duplication
Illusion creations
Ergokinesis
Portal creation
Ghost summoning
Size changing
Technopathy
Telekinesis
Mind control
And probably a bunch more, if I did write a story it would probably be about a guy waking up as king boo in ghost realm all his own, and then setting out to rule all the ghosts in the world as a real king
If anyone wants, they can use the idea not like I own the character