Create a whimsical illustration of King Boo, the infamous ghostly monarch from the Mario franchise, capturing his mischievous personality. Depict him sitting regally on a throne, adorned with cobwebs, surrounded by spooky yet playful elements such as tiny ghosts, bats, or spider webs. King Boo's ghostly body glows with a soft, ethereal blue light, while his eyes gleam with a wicked orange glow. He wears a tattered, black and purple crown, with a few gold accents, and a wicked grin spreads across his pale, translucent face. The throne room's walls are draped with tattered, old tapestries in shades of purple, gold, and crimson, with flickering candles casting eerie shadows. The overall atmosphere is eerie yet playful, capturing the essence of King Boo's spooky yet charming persona.