You can use these for such things as changing number of rounds or unlocking hidden characters, such as Baek in Tekken 2 ... Devil Jin Eddy is an extra outfit you buy for Christie (500,000G ...

Eddy would actually skip the tournament for Tekken 4, but was a selectable character as was his student Christie Monteiro. He would share character select slots with her in Tekken 4 and Tekken 5 ...