I also liked Frank Lopez's character. He was always laughing (except, of course, when he was killed

) He brought a lot to that character.
Omar (F. Murray Abraham) was another good one. I especially liked the scene when Tony and Omar are at Sosa's place. When Sosa excuses himself from the table and goes inside, Tony and Omar have a brief exchange. Some of my 2-liner favorites:
Tony: F*ck you, how's that?
Omar: No, f*ck YOU!!!
(Omar's expressions during this scene were priceless!)
another brief one -
Omar: You're here to watch my back!
Tony: Better than your front, lemme tell ya...