20 Mind-Blowing Facts You Didn’t Know About Family Guy
8. Peter Griffin Is Based On A Security Guard
Given that it sounds similar to other voices and is written with such prominence, it's surprising to learn that, according to Seth MacFarlane, Peter Griffin is the damn-hell hardest voice to do. You assume it has to be something do with maintaining the obliviousness to the punchline; if anything, Peter plays his stupidity straight.
The voice comes from a general stereotype of someone who speaks before they think, but the most prominent inspiration was a security guard MacFarlane overheard during his time at college. As he has creative power of the show as a whole, it's likely this man also provided some of Peter's greater character, making him a (probably unknowingly) very important person.