In an interview with Nintendo Dream, it was revealed that the Best Fitness Friends (the main antagonists of the "Bowser Jr.'s Journey" side mode) used to work for the game's main antagonist Fawful alongside Midbus. By the events of the game, however, they have largely distanced themselves from Fawful, instead running a shop that sells a variety of things. Additionally, it was revealed that they are actually members of the same race as Midbus (hence why they have the same skin color as him), but their relationship with him has soured.