I wantet to point 1 thing out. Its nothing to do with the pic its in your comment the Pic is great 100% great
You copyrighted it to Robot Chicken but I do not think Robot Chicken even holds the copyright to it. I checked in the copyright regerstry on the US gov site. and could not find anything. I wanted to see who held the copyright on all of them because I plan on using them in a fan-fic of my and need to know who I need to note the copyright to. And I want to copyright them to the right person.
yea i'm sure my friend who requested the drawing got the idea from robot chicken. I dont even know what that is, really. lol I would think you don't need to worry about copyright issues unless you're publishing your writing or making money from it somehow.