There are .pfb files in other WayForward titles also, and as far as I can tell Random Talking Bush is correct. The one I have here from DuckTales looks like it doesn't have much of any image data inside (if it does, it's negligible), and includes lots of references to external .tex files, where the actual image data for particles is stored.
If Half Genie Hero has any .tex files, you can extract them with the shantae_tex program here, which will spit out the images you're interested in. Chances are they're just particles, however, and not alternate costumes.
If Half Genie Hero has any .tex files, you can extract them with the shantae_tex program here, which will spit out the images you're interested in. Chances are they're just particles, however, and not alternate costumes.