Question: I'm trying to write a letter to the editor of my local paper about their report of a man who doesn't think the rules apply to him. Is there a word for this? He's a bit of an egoist, demanding to speak at city council meetings after the public hearing portion of the meeting has been closed.

Answer: 
What about *misfit* since you said 'rules doesn't apply to him'?
I kind of like "self-important gadfly", but that's just me. "Gadfly" can have positive connotations when not qualified.