tristanlist: This information is coming in rather late for you I'm afraid, but my favorite editor is CharacterEditor2.2 from the files area of the group. The DL group is very old— both predating and outliving its former host Yahoo I believe— and is associated with darklands.net. Go ahead and join it.
https://groups.io/g/darklands/files I'm afraid my copy of the game is equally old, so I cannot comment on why or whether the aforementioned EDITOR.EXE is not included in GOG's package. I hope it is, since it and the jukebox were originally released, with 3.5" diskettes physically mailed to customers, as part of MPS' final update version and bugfix for darklands.
* EDITOR.EXE is ideal for editing inventory.
* CharacterEditor2.2 is deal for everything else, including quest viewing, teleporting, fiddling with the map seed, you name it.
does character editor 2.2 allow for changing the avatar? And if it does, does it overcome the color corruption bug? I've always wanted to play a game where I can swap out members of the party, but the colors get corrupted whenever you use the inn to swap in members.