Surely no one would actively want to look like Peter Griffin. He’s fat, obnoxious, and looks like he could have a heart attack at any moment.
However, I guess if you already look like Peter Griffin you may as well use that fact to your advantage. Which is exactly Robert Franzese is doing.
Franzese bills himself at the Real-Life Peter Griffin. He unarguably looks like Peter Griffin, but to complete the transformation he has to sound like him too. Which he most definitely does.
This video shows what happened when the Real-Life Peter Griffin went to the New York Comic-Con. Forget all those other cosplayers, as this one surely beats all-comers.