A while back I created these shaders in Unreal which are actually post-process filters which you can apply on top of your existing UE4 scene to change its look. Post-process effects like these are really powerful in order to change a scene’s look. I created these filters after reading an online article about toon outlines which you can read here. You can also create your own materials like these ones after understanding the principles and math described in the article and highly recommend you to do that. The master material graph is a bit extensive but not to difficult to break down.