From what I’ve read it can really depend on the person...There have been Godfathers with extreme violent tempers(like Albert Anastasia/ Known as the Mad Hatter..Worked for Murder Inc.)and then there are Godfathers like Carlo Gambino who was refered to as a servile cringing Squirrel of a man by Bonnano..
But what one of the most clever Godfathers who increased the Gambino family to one of the most powerfull in NY and stayed in power for 18 years and died peacefully in bed.
In the book,Don Vito” rarely got mad. He thought showing your temper was a weakness.
Look at what happened to Sonny when he blew his top. Mowed down by enough .45 bullets to sink a battleship.