I made PalMod palettes for every Guilty Gear AC+R character based on the Game Boy Color's default palettes!
Free to use, credit me if asked.
I have these all set to the EX Punch slot personally, if you happen to run into a player named "goopshit" online.
All the PNG files are under the linebreak, just drag the file onto the PalMod preview window when set to the palette you wish to replace, and it should just apply all the right colors.
edit: changed bridget and aba to look better
edit 2: made both sols less shadowy
edit 3: made may less bright, made dizzys clothes darker
edit 4: made ky more bright and fully redid robo ky
edit 5: justice touchups, made her hands n hair nicer
edit 6: made jam and millia easier to look at, and changed some almost not black colors to actual black on zato, zappa, testament, i-no, and johnny
edit 7: tweaked mays marine life, and made all the pirates different colors
edit 8: full axl redo
edit 9: full potemkin redo, fixed one single pixel on i-no