I created this rigging script because we were getting a lot of characters that needed to be rigged and animated. We needed IK joints but plugins like duik and rubber hose would weigh down the application with unneccesary functionalities. Another challenge was that many characters would have different or exaggerated proportions, and building a custom rig each time was a cumbersome task. So I wrote a script to take layer names from an Illustrator File, and in After Effects, input an IK expression to the rotation attribute of the upper leg, for example. This would create a perfect, light weight rig automatically.