It seems to me that, although there are a number of types of comedy characters, the ones who have consistently really made us laugh (or, me at least) as a main character are very very simlar.
e.g. (as a random selection)David Brent, Alan Partridge, Blackadder, Rik Mayall (any of his characters, they're largely the same), Harold Steptoe, Arnold Rimmer (and Gordan Brittas), Tony Hancock...
Obviously this could go on, but what I am getting at is that, generally speaking, a huge amount of main characters in comedy are: delusional, pompous, and hope to be/think they are something they are not and/or don't quite understand (upper class, popular, cultured etc.)
Now, I'm perfectly happy for you to dispute what I have said so far, but assuming that at least some people agree that a vast majority of hugely successful main characters in comedy fit this description, then I suppose my question is this:
How can such a seemingly slim set of characteristics continue to make us laugh, and why aren't we bored with it?
For those of you who are writing (or trying to), can you manage to create an original character without looking at it and thinking that it is far too similar to one of the above?
I mean, if someone had suggested David Brent to me as a new character, I would have said he sounds far too similar to Alan Partridge. Yet they are very different.