Character Cel Shading Material performs an independent lighting pass that does not use scene lights by default. Basically, the light direction and color are controlled by a parameter collection named CharCelShadingParameterCollection at \Content\CharCelShadingPack\CharCelShadingParameterCollection. Users can manually input light direction and color in the collection to change the cel shading light condition.

The values in the CharCelShadingParameterCollection controls the cel shading light condition