But that doesn't properly encapsulate the incredible goofus that a Mack can contain, so it'd have to be a cat who's damn big, but utterly without predators or challenge of any kind in its natural habitat so the don't-give-a-fuckitude is off the charts while simultaneously being a colossal sweetheart.
So not-a-lion Mack would be a Maine Coon. Look at all that floof. That's a dissipating sink for all the fucking awesome.