@IAmJason it's missing transparency, when you don't enable it in blender, that black block effect happens. When you change hair color, you only change the actual hair color texture, nothing else. If you touch anything else you're gonna have issues since if you're just changing hair color, you keep the other three maps as is. Also when recoloring in paint.net or photoshop, don't color directly near the transparent parts of the texture or map, start on a part that isn't transparent and gradually ease in on coloring the transparent parts since not doing so will cause the transparent parts to have a weird tinge at the ends.
Also please from here on out, post mod help and other non DOA6 revival costume thread costumes in another thread, I don't mind helping if i can but the main thing in this thread i want is ONLY my posts showing my work, this isn't a modding help thread. Make a separate thread next time/post in your existing ones and I'll assist if i can, just tag me but be aware im not going to be able to help for everything, so if I dont reply or someone else doesn't thats likely the case. Thank you