The shading of our art style was a combination of base textures, our stylized lighting term, and the stylized lightmap (for static objects). The image below details the stylized lighting term.
The stylized "brushed lighting" term of the shader could produce a variety of texture-driven looks
The left object is the Standard shader within Unity. The right is our stylized lighting shader.
Different media styles that the shader could produce
So that the art team could easily change the style of the shading, my goal was to have the medium of the shader texture-driven.