Well King Boo doesn't appear much in the main series
Super Mario Sunshine: doesn't talk and is just a boss
Super Mario 64 and Super Princess Peach: same thing as Sunshine
He also appears in a-lot of the spinoff games but those aren't considered canon but he definitely wouldn't qualify here since he is having fun and playing games with the heroes
So no he doesn't qualify but the King Boo in the main series is so different to his Luigi's Mansion version that there pretty treated as separate characters
Also its important to point out that King boo doesn't even qualify in the original Luigi's Mansion only in Dark Moon