Unity IK Issues

I read through the Unity documentation concerning Unity IK, Avatars, and Masks. I have confirmed that in order for Unity IK to work, an Avatar must be correctly configured for the character being used. This took a while for me to figure out since all video tutorials skip that step entirely. So, I have read through all of the documentation needed to determine all other steps to be taken for Unity IK to work on a given character. In this example, I have a Team-Fortress-esque character in an idle pose, whose legs I am controlling with IK effectors.

Now, I can proceed with experimenting with ways to functionally apply this Unity IK to make any given character do a variety of interesting things.