Since Mario Tennis Aces on the Nintendo Switch 1 had itself DLC that brought in more characters, Mario Tennis Fever on the Nintendo Switch 2 should do the same. I already have some idea on what each of them could be, back what matters is including Baby Daisy, a character who as we know is meant to be playable in every Mario spinoff where Baby Peach is playable, plus this is a game which includes baby counterparts and who it includes for the first time ever.