Sorry to say this. But, blender doesn't support transparency maps. Tho when, you port the model to something like Xnalara, garys mod, mikumikudance. The transparency issue no longer exist . When you port the model to a better game engine or animation tool that supports transparency maps.
If the issue still exists. Edit the pngs to be transparent . Than remove the black textures. Save the png this can sometimes fix the transparency issue . Tho blender really doesn't support transparency images.
If the issue still exists. Edit the pngs to be transparent . Than remove the black textures. Save the png this can sometimes fix the transparency issue . Tho blender really doesn't support transparency images.