Are typical panels side by side or what?
Your bad guy could be someone who does mean things like popping party balloons, yelling at adults, sticking his fingers in the cake and other things along that nature... I could whip up a panel when I get off work at 3 central today if you had room for one more..

I could have him popping balloons in my panel if you want.... For anyone else I would make him a muscely guy with a yellow outfit with a blue sash tied across whis eyes and nose with eye holes and tied in the back. He would have blue knee high boots and a blue belt/ sash tide at his waste.. He would have a large mouth and grin the whole time...
Let me know if I can...