A "V0.4 All Unlocks Save File" is available on Speedrun.com which includes all characters already unlocked.
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If you have already unlocked them on another machine, or just want to skip the grind, you can use save editing to "unlock all characters" instantly. Locate your Fontfly LNS save data. Use a Hex Editor or Specific Mod Tool: Open the file. final fight lns ultimate unlock all characters
Launch the game, head to the character selection screen, and enjoy the fully expanded roster. Method 2: The In-Game Secret Code (No Downloads Required) head to the character selection screen