Tekken Tag Tournament: Make Time-Released Options Permanent
This one can also seem tricky at first, but it's easy once you know how. Take note of the steps given in the Cheat Comment shown below and follow them exactly:
So, as it says, before opening the game, manually delete the tektagt nvram file
first, (although, if you haven't ever launched the game yet there will be no nvram to delete). Either way, start the game and pause it on the initial screen as fast as possible then enable the cheat:
Un-pause and wait until after this next screen and the cheat will be saved:
Now every time you start the game, instead of two rows of hidden characters like this...
...you'll always have the complete roster!
If it doesn't save just repeat all the steps again while trying to quickly pause the initial screen.