I would choose Carlo Caputo: never killed anyone, just didn't pay his taxes.
Also, Harry Riccobene, because he is too similar to Santa Claus with that beard he grew up in prison (ok, I am joking, but nevertheless the similarity is striking, and the symbolic Christmas presents he sent to Angelo Bruno in exchange for independence give credit to the theory he is/was Santa )
Willie Marfeo to Henry Tameleo:
1) "You people want a loaf of bread and you throw the crumbs back. Well, fuck you. I ain't closing down."
2) "Get out of here, old man. Go tell Raymond to go shit in his hat. We're not giving you anything."
)