This isn't a shader effect file, but a material setting within the PMX editor. By setting a texture as "Self Shadow" and "Toon," you force the model to display only two colors regardless of lighting.
While Ray-cast is technically a path tracer, the "Ray-Toon" hybrid build allows you to have realistic reflections on the floor but toon shading on the character. This is currently the most advanced style, blending 2D characters with 3D environments. toon shader mmd
A combination shader that adds a white "rim light" (outline highlight) to the toon shadow. This creates a 3D pop effect that standard toon shaders lack. This isn't a shader effect file, but a