King Boo

King Boo is a major antagonist in the Super Mario franchise, most notably serving as the main antagonist of the Luigi's Mansion series. As his name suggests, he is the king of the entire Boo race. Initially seeking revenge against both of the Mario Bros. for their past victories against his minions, King Boo is defeated by Luigi and trapped in a portrait for years. After breaking free, King Boo becomes increasingly obsessed with outsmarting Luigi and torturing him as payback, to the point of using his own Boos as expendable tools and being willing to destroy the entire universe just to win. Over time, he has become Luigi's arch-nemesis akin to how Bowser is to Mario himself, and to how Madame Grape is to Princess Peach Toadstool. He is voiced by Toru Asakawa, who also voiced Bleak. In the Luigi's Mansion series, King Boo appears as a large Boo with magenta eyes, an indigo tongue, and gray body that is sometimes shrouded in shadows. He also wears a gold crown that has a large magenta jewel embedded on top of it. In the first Luigi's Mansion game, his eyes and crown jewel were originally red in color and his tongue was originally blue in color.King Boo seems to have a passion for gambling, as the entrance to each wing in Luigi's Mansion was modeled after a playing card suit (spade, club, heart, and diamond),Lastly, King Boo has a distinct cackle, which is significantly lower in pitch than other Boos. King Boo is notably darker in the Luigi's Mansion series than in other games. He was initially much fairer in his rule, going out of his way to save a high-ranking Boo and generally acting fond of his own troops. King Boo seems to be even more determined to achieve his vengeance, sadistically taunting Luigi over the capture of his friends and family while becoming visibly infuriated by his forces' inability to stop him. He eventually becomes fed up with relying on other ghosts to do his dirty work, deeming them all as useless, and instead decides to forego carefully laid out plans and traps in favor of tackling his enemies directly. During the final battle, he focuses himself entirely on removing his opposition to the point where he is willing to trap The Last Resort and everything around it inside a painting simply to get rid of Luigi. Overall, this version of King Boo is a purely evil spirit who disregarded any care he initially had concerning his subjects. Has a desire for revenge.

The Mansion from the first game!