My understanding is that Vito Andolini Corleone was a composite of different Dons in real life. He had traits like Don Gambino (quietly built an empire), Don Luciano (masterful underworld organizer)and Don Columbo (very, very powerful friends). I sure there were others made in the composite also. He reflected the "best" of the Dons; money, respect, power, focus and determination. 
"The Godfather was a man to whom everybody came for help and never were they disappointed. He made no empty promises, nor the craven excuse that his hands were tied by more powerful forces in the world than himself. It was not necessary that he be your friend, it was not even important that you had no means with which to repay him. Only one thing was required. That you, yourself, proclaim your friendship. And then, no matter how poor or powerless the supplicant, the Godfather would take that person's troubles to his heart. He would let nothing stand in the way to a solution of that person's woe. His reward? Friendship, the respectful title 'Don' and sometimes the more affectionate salutation of 'Godfather.' Perhaps, to show respect only, never for profit, some humble gift - a gallon or homemade wine or a basket of fresh baked goods on a holiday. It was understood to proclaim that you were in his debt and that he had the right to call upon you at any time to redeem the debt by some small service." -- Mario Puzo, The Godfather (1969).
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