With a simple click, unlock all 38 fighters (including the original 20 from Street Fighter and the 19 from Tekken, plus the 2 additional characters) in "Street Fighter X Tekken."
service is defunct, many players use community patches or manual edits to access DLC fighters like Mega Man and Pac-Man. Steam Community How to Unlock All Characters (Manual Method) With a simple click, unlock all 38 fighters
(Note: The folder number "222120" is the App ID for Street Fighter X Tekken) With a simple click