Who walked you through the event editor? On what site did you meet this person?
Someone on a message board and I can't even give you his name. It was someone whose name I don't even recognize if I see it. Note this message board doesn't even exist anymore. I've even checked other forums that mentioned the board and they say "Sadly, it seems to have died, and the info it had is basically all gone."
What sprites have you done palette editing for? Did you use a hex editor or some other program?
Just Ginny and Vyse.
Did you do any other event editing besides palettes?
Bum Rush, a few triggers here and there that I can't remember. Basically, I actually changed stuff, and it really is not as easy as it sounds, as you have to know exactly what you're doing.
What was the original problem that caused you to seek help to fix it in the first place? Which sprites displayed with the wrong palette (World map? Town maps? Plot scenes? Battle sprites?) ?
I can't remember since it was a long time ago, but I did check and the info still isn't easily accessible. You claim "New info since I last worked on it!" but truth, I'm finding all the same stuff that is there, and I'm finding that things that USE to exist don't anymore (one was this big hacking resource; you click on a link...you get a non-existent URL.)
How long ago did you make the changes? Did this affect any other (non-NPC/PC) graphics (such as monsters, spell effects or map tiles)?
I honestly have no clue, but fucking with it is not something you should be doing.
Altering this is a very precise thing, and you really don't want to delve into it. Again, no new info has actually been revealed like you claim it has; its the same stuff, and its not a simple case of a few pointers. TO give you an idea, since one example I found...
One instance of Edgar in FF6 is *NOT* Edgar, as far as the event goes. Its actually Terra, but they give her his Sprite and Palette for the scene. Why FF6 is programmed this way, I don't know, may have to do with character values and what not, and easier to just alter the sprite/palette for the scenario, then adjust it back, than make a whole script adjusting which character is called upon.
Either way, its a lot of event hacking, and it really is delving into something that one minor futz up could really screw everything up. This is why I really don't want you getting into it, and why I'd prefer you just didn't.
Do you understand now what I mean by you're asking for resources that don't exist anymore? Some quite literally have been purged as the forum that this info came from is in the graveyard, the person I talked to I quite literally cannot contact anymore cause I don't remember who it was, and looking for the info myself, I came up with nothing other than "Fix things manually through event hacking." I once almost screwed the entire game up changing one trigger of redundant useless data (one of those "End event" things used twice in a row), and I was lucky enough to find a way to fix it. The instance it gets into event hacking, I'm just gonna have to decline the idea, and that's what you're getting into.
Also, unlike Battle Sprites, event, over world, NPC palettes, etc. can't be easily tested, cause of how the game loads data. So something could seem like its fine (or alternatively, something seem like its not fine), and the reverse is actually true. That's probably why Ginny seems to be working in your case when in a fresh genuine file, she'll suddenly have a color change that you did not intend. There's a lot of crap to work with, and I'd really just appreciate you didn't delve into it. I spent time to rectify a scenario, and you're putting it back into a state that is more likely to have adverse side effects I'd definitely prefer to avoid it.
(Sprites, unlike Palettes, are pretty much exactly as you see on the tin, so if it looks fine in a sprite editor, there's a 99% chance it'll look fine in game. Its usually animation nuances that are hard to tell, and only trial/error works that away. Palettes...are a totally different story though)