All characters and color variations in Mario Tennis Fever
Mario Tennis Fever boasts one of the largest rosters ever seen in a Mario Tennis title with 38 playable characters and 20 color variations . Like in other Mario sports games, you'll start out with a set of characters that are available as soon as you launch the game, but there will be another set that you'll need to unlock through a series of challenges. Mario Tennis Fever has streamlined the unlocking process, but there are a few unlocks that are a bit tricky. source https://www.polygon.com/mario-tennis-fever-characters-color-variations-unlock-all-how-to/