PEZ's flag

Oh, it's the "anarcho-capitalist" flag? Maybe he did request it... ;) [1] (Nice job, Google search by image!)

Yes, it's the an-cap flag. Dunno if Google search told you it's also Voluntarist the flag? I'm a Voluntarist and think nations/countries are a totally bad concept. Didn't want to be representing a nation. As to the missing request, I issued a pull request to the Roborumble code repository at Github as the flags are still more or less hardcoded. (I might attempt to change that.)

Here's a cool one to try. =)

Search by image is cool. Even better with the Chrome extension for it.