Reply To: When attempt to change the background colour it is overlayed on top of character and all I see is the background colour, any thoughts as to why this is happening?

Just make sure that you order it correctly.
It will be displayed from the top layers to the bottom.
So either make sure that it is below what you want to be visible OR separate it out as a new grease pencil object and then position it behind in 3d space.  That way layers don’t matter.

Hope that makes sense.