But that’s probably not what’s actually going to happen here.
When Mario has been given life previously, in the Super Mario Bros. movie from 1993, or in the live-action/animated television show from slightly earlier, Mario wasn’t strictly Italian.
This is, of course, assuming that the goal isn’t to make the movie ridiculous.
Mario is traditionally a plumber from Brooklyn, and so whether he was played by Bob Hoskins or Captain Lou Albano, Mario just had a heavy New York accent, not an Italian one.