If you use a hex editor, such as
Hackman or
HHD HexEditor, you can replace 'Hero' in the
quickinfo.000 file in the saved game folder with a different 4 character name. I tried adding extra characters, but that just caused Divinity to crash. The value in the file which tells Divinity the length of the name was not immediately obvious, but with a little trial and error could likely be determined.
PS make a copy of the saved game folder first, before editing. It couldn't hurt to also make a backup of the quickinfo.000 file in the new folder, just in case.
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