As admitted in that thread in the Newcomer's Board (the one no one has replied to yet because they are taking their time to compose the most informative post that will blow my mind in the most dick-shattering way), I am returning from a hiatus so my memory is faint.
But I have some faith that I remember some of this.
It uses the same palette that I use in my tile editor of choice, Tile Layer Pro (TLP)
However, when I import the bmp to tile layer pro, it ends up looking like this.
Okay, is the palette you are using taken straight from a ZSNES savestate?
Also, you might want to try Tile Molester.
If I were attempting this, I would try the following strategy.
Play the game in ZSNES, and when the graphics you want to edit appear, make a savestate in ".zst" format.
Load up the ROM in Tile Molester. It's been awhile, but IIRC SNES graphics in Tile Molester are 1-Dimensional 4bpp planar, composite (2x2bpp). Someone please correct me if I'm wrong.
to where the graphics you want to edit in the ROM begin. The colors will be fux0red, because Tile Molester has not loaded the correct palette. Have Tile Molester load the palette from the ZSNES savestate you made. The colors might still look fux0red, so hit the arrows at sides of the palette box until you get the right colors.
*Struggling to remember the rest due to amnesia.*
Okay, if you got the correct colors to appear, Tile Molester should have the option to export what you see
into ".bmp" format. I emphasize on "what you see", because it will not export the entire sprite sheet; only what you can see in the window. My advice to you would be to export the first set of sprites you see and save it as "[character]page1.bmp" or something. Then hit "Page Down" on your keyboard, export what you see next and save it as "[character]page2.bmp" or something, then hit hit "Page Down", export what you see next has "[character]page3.bmp" and so on. You should get the idea.
Now, the ".bmp" files you exported from Tile Molester are the graphics you should edit!
I recommend JASC Paint Shop Pro 9, but if you can find something better, more power to you. Use JASC Paint Shop Pro 9 (or whatever you think is better) to edit each page of sprites to your liking, but only use colors that are contained in the ".bmp" file's palette!
If you use different colors, you will need to use SNESPal to change the ROM's palette to accommodate for this, and this is a whole separate headache that I don't want to go into, and neither do you!
When you are finished with your edits, load up your ROM into Tile Molester with the proper settings, go exactly
to where the graphics you want to edit in the ROM begin (as you did before), then point Tile Molester to load the correct palette from the ".zst" savestate.
Open "[character]page1.bmp" or something in another window in Tile Molester. Select every thing you currently see on that "page" in the ROM, and clear it. Then, copy everything from "[character]page1.bmp" or something into that blank space. After this, right-click to "de-select" stuff, then press "Page Down" on your keyboard. Open "[character]page2.bmp" or something in another window in Tile Molester. Select every thing you currently see on that next "page" in the ROM, and clear it. Then, copy everything from "[character]page2.bmp" or something into that next blank space. You should get the gist of what I'm trying to tell you.
Again, I am recovering from a sort of ROM hacking amnesia. If anything is unclear, let me know!
And if I am incorrect, someone please correct me!