Yes, since I assume you pair your ideas with pictures in your mind, try to recreate the pictures first. Then, if it's possible and it looks good for you, you can go deeper and finish your project

While not casting shadow nor affected by light itself? Is it even possible? I want to make the green screen panels to "catch" shadows from other models, while keeping their texture color and not affected by light intensity.

An alternate would be if there are any invisible models that catch shadows?

Yes, and when I press any of the tangets, the main tangent is animated to the right direction, however that jitterish thing keeps it's place and it doesn't fix it

http://puu.sh/gMOPu/0573397a21.jpg
Why does this happen? I only selected 1 bone of the model and animated it in graph editor, however it also applied this weird transition which caused that bone to go back and forth. I didn't import any sequence in motion editor nor use any of the sliders. This happened while I was animating by my own