[quote=@TheWindel]
For some reason, I always imagined him being made of hamburger meat on the inside.
[/quote]

I imagine he's incredibly lean. No unnecessary fat or muscle, no pesky internal organs. Just the minimum to do his job efficiently. 

Of course, I also imagine that he's an alien life form, and I'd rather not be the first person to test whether he's poisonous to regular people.