RDPTest - Unused Stuff
Yes, even my older Libdragon homebrew games and demos might have unused stuff and leftovers in them. Starting in the latter half of 2017 I began using a fork of libdragon which had improved RDP functionality, among them being palettes, and unlike the latest libdragon of today palettes weren't embedded at the end of the sprite files, so one would have to search the ROM to look for anything resembling a palette, if any could be found.
Fortunately I mostly kept the files generated by Sprite64, so I wouldn't have to do the huge task of identifying the format of a image... but I did it anyway just to give an idea about the formats they were exported to.