Alright upon further testing, this mod does work on PC (at least on the steam version). It modifies the save location for the game for some reason... and I'm still not sure why. This is the reason why it appears corrupted - because the game can't find the save files, and so it looks like as if you're starting the game from the beginning again.

Switch location: /contents/010045301B86C000/romfs/Game/Content/Paks/~mods/
PC location: /{RotS_Game_Location}/Game/Content/Paks/~mods/

For PC version, you need to copy your save data, and it looks like the game will use the new save folder location from there on as long as you use the mod.
Before: /Documents/My Games/Romancing SaGa 2 RotS/Steam/{Steam_ID}/Saved/SaveGames/
After: /{RotS_Game_Location}/Game/GlobalConfig/Saved/SaveGames/

As always, make sure you create a backup of your save files first before using this.

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Changelog:

• 1.0.0: Initial mod upload
• 1.0.1: Removes DT_PartyCharacterParamDataTable from modified files for better mods compatibility - if you've previously downloaded the mod, there's no reason to update currently until there are mods that need to modify that file.
  

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This mod will modify the stat distribution of all characters to ensure they use the maximum possible stat for their class. As an example, using this blog as a reference for the stat of each character's generation:

https://romancing-saga-2.blogspot.com/p/characters.html

For Ninja, the stat distribution for all generations will become:
Str      : 21
Spd     : 22
Dex     : 22
Magic : 18
Stm     : 15
Log     : 18
LP       : 13

Note that the mod will only apply for the characters not currently in the party. For characters in the party, you'll need to dismiss it first in the tavern so that it will load the new character stats (I don't think this will work for the current emperor / empress though. You'll need to either abdicate or do a generation skip for the mod to apply to the next emperor / empress).

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This mod is created by using Gimmicking's UCAS UTOC Packing Tool and UASSET Editor. If you want to try using them, you can search for Pikmin 4 modding tools on your search engine.

Mod creation steps:
1. Use the UCAS UTOC Packing Tool to extract the pakchunk utoc / utas into .uasset files.
2. Use the UASSET Editor to convert the .uasset files extracted from step 1 into .json files.
3. Edit the .json files.
4. Use the UASSET Editor to convert the .json files back into .uasset files.
5. Use the UCAS UTOC Packing Tool to repack the .uasset files into utoc / utas / pak file which you can then use.

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Compatibility:
This mod alters DataTable asset, so it will only conflict with other mods that modify the same file. The modified file includes:

DT_PartyCharacterStatusParamDataTable

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If you want stronger characters, check out enixl's mod!
https://www.nexusmods.com/romancingsagarevengeoftheseven/mods/20