CGA would require very special kind of shaders. So let's talk about Unity shaders in this thread
I'm only just digging in but I'm finding great results with unlit shaders for materials and UV textures. I'm fairly new to Unity and I'm actually achieving the toon outline in Blender by setting up a duplicate object, scaled up, and normals calculated inside so the outside faces are culled in Unity. If someone has a better trick for the outline I'd be excited to hear about it.
that is cool mate, I'd never guess a duplicate object could become an outline! thanks for sharing :)