I with everyone here about Cicci, Clemenza and Frankie ....but I'd add I also have a soft spot for certain "villains" in the GF movies, all of whom played relatively small roles, but whose acting proved the maxim "there are no small parts, just small actors who play them.

Sollozzo
Barzini
Don Ciccio
Luchese


"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"

"I stood in the courtroom like a fool."

"I am Constanza: Lord of the idiots."