Mario Strikers: Battle League will get free DLC content updates that include new characters. A demo is available to try now through Nintendo Switch Online.
Mario Strikers Battle League adds Diddy Kong and Pauline as playable characters
Mario Strikers: Battle League
Mario Strikers: Battle League
Nintendo Switch Online Updated With Mario Strikers: Battle League Icons – NintendoSoup
Mario Strikers Battle League updated to Version 1.3.2 (patch notes) - My Nintendo News
Which of these drivers, exclusive to Mario Kart Tour (so don't count what was in another MK game) would you most like to see in the MK8 DLCs? : r/ mariokart, mario
Free Update for the Mario Strikers: Battle League Game - Play Nintendo
Mario Golf: Super Rush DLC Roadmap (2021): Free characters and courses - GameRevolution
Mario Strikers: Battle League Second Free Update Now Live, Here Are The Full Patch Notes
Mario Golf: Super Rush: What unlockable playable characters are there? - GameRevolution