You can use "Rental Fighter" tickets (earned through the Fighting Pass) to try DLC characters for one hour.
: This is described as a "legit" DLC unlocker for Steamworks-based games. It operates by intercepting Steam API calls to report that the user owns the DLC. sf6 dlc unlocker
On PC, these tools typically exploit the Steamworks API or inject custom files into the game directory. You can use "Rental Fighter" tickets (earned through