I don't try to sound like anyone but me anymore. If something is out of my element, I try to avoid it.
The truth is often a terrible weapon of aggression. It is possible to lie, and even to murder, with the truth.
My brother was an improviser. He's now a lobbyist, but he used to perform improv in the city when he was in high school, and one of the funniest guys I know to this day.