Supporting Characters in My Background Scene

I would like to create some supporting characters that are thematically linked to my character. It will be a good idea to trace the silhouette of some silly bands that are related to my character with the pen tool to create a set of "silly bands" that accompany my character on the background.

For some reason, I think putting Halloween characters into the bamboo forest is a cool idea. These Halloween figures will bring some mystery effects to my background.  

Here are the Halloween silly band characters I traced using the pen tool in Illustrator: