Here’s a complex method:
- Back up your save files (no need to back the “maps”, just the .sav files)
- Open a base64 converter, for example https://www.base64encode.org/
- Convert your new name to base64. Add
# as the first character.
- Rename your old character’s files to the new name in base64. Keep the extensions
For example, if your old character was named “Reyes McCartney”, you would have files named “#UmV5ZXMgTWNDYXJ0bmV5”, with different extensions. If you wanted to change character name to “qwerty”, you’d encode it in base64 to “cXdlcnR5”, then rename old files to “#cXdlcnR5”.