Funniest character you've seen in documentaries
As they say, 'Fact is stranger than fiction', and some of the (ostensibly) real people in documentaries are funnier than anything Christopher Guest has ever come up with. And the bonus is that these people aren't even trying to be funny. They're just being themselves, and it's absolutely hilarious.
So, for example,
Mike Schank from American Movie
Tom Biscardi from Shooting Bigfoot
Benny from Hands on a Hardbody