King Boo will be a playable character in the Super Smash Bros. Bowl: Cheerleaders vs Coach Potatoes. He was not a veteran because he wasn't a character playable in Super Smash Bros. for Nintendo 3DS and Wii U.
King Boo stole all the Coach Potato songs from Sheik and Zelda during both High School Musical 2 songs You are the Music in Me and I Gotta Go My Own Way. While the Wildcats say to 'Bridezilla' Jacalyn Fenske, King Boo can't link to Link.
King Boo is one of the only Ghost types to not be from the Pokemon Universe. Instead it is from the Mario universe.