Shadow of the whole character

I have a problem. I have a cut-out character made out of many drawings. Now I want to create a shadow in the exact shape of this character, but I don’t know how to do it.

Is there any easy way to apply the Shadow Effect to the master peg (not each drawing separately), so that the shadow always reflects whatever I draw inside the peg.?

Thank you very much!

Here is a short video demonstration:
(no sound, it’s all very easy and straight-forward)

Otherwise, consult the integrated help menu.