It's been a while since I did it but most of the stuff on my model was done through just reworking the textures! The hair was mostly just a flat texture with some lighting gradients put on. The hair itself is actually one of the defaults in vroid, I just changed the shape a bit. I know usually when you think of slimes you think of more globby, rounder hair but when I used the texture on the more straight edge hair it reminded me of strips of candy and I really liked it lol