If you feel guilty about using a save file, or simply want the satisfaction of earning it, here is the fastest path to unlock everyone without cheats:
Or... just use the save file.
Tekken 3 features a robust secret roster. Without unlocking them, you are missing half the fun. Here is who you are missing on a fresh save file: tekken 3 all characters unlocked file download pc
Grinding for Gon alone requires beating "Tekken Ball" mode 5 times without losing a round. That is a tedious task most adult gamers simply do not have time for. A single save file fixes all of this instantly. If you feel guilty about using a save
Search for a file typically named Tekken 3 (USA) 100%.mcr or Tekken 3 (All Unlocked).srm. Ensure the region matches your ROM (USA, Europe, or Japan). If your ROM is the USA version, do not use a Europe save file. Grinding for Gon alone requires beating "Tekken Ball"
If you installed the file and the characters are still locked, try these fixes: