Cyrano Jones. I'm always going to have a soft spot for Stanley Adams. Got to see him at one convention, but he sadly died before I ever got the chance to see him again. The man was a laugh riot to be around. He was a comic like Robin Williams, always "on stage" even when he wasn't.
I think I mentioned elsewhere that the other character I always watch for is Eddie Paskey, aka Lt. Leslie. The man was in 75% of all the TOS episodes, if you know where to look. He occasionally got a speaking line, and even was the driver of the truck that mowed down Edith Keeler in "City on the Edge." Watching for Eddie makes a great Trek drinking game, BTW....
Number Two: Conform, Number Six! Conform!
Number Six: I will not be stamped, filed, indexed, briefed, debriefed, or numbered! I am a person.