Koopalings?
There’s one overt reference to the Koopalings in the movie; the piano that Bowser plays has Ludwig von Koopa engraved on its front. Ludwig von Koopa’s appearance resembles that of classical composer Ludwig van Beethoven, which makes his name reference on the piano appropriate. In fact, a lot of the Koopalings’ names are based off of music artists’—Lemmy Koopa takes his name from Lemmy Kilmister, the lead singer of Motorhead, and Roy Koopa is named after Roy Orbison; they both wear signature dark shades.
According to the original canon, the Koopalings were Bowser’s seven kids. They were later retconned to be his underlings, with Bowser, Jr. as Bowser’s only son.
