This is a fantastic concept and I really love the character. I'm interested to find out more about this crazy world you've created for him.
One thing I would say is that the bg colours are fine but the design doesn't really compliment the character. Although it still works pretty well, and isn't what you focus on anyway...only noticed it after I'd read and examined it all. The illustration is quite fantastic imo, I'm currently doing it in 'my style' in the thread you posted it in recently. Should be done soon.