I'm surprised that good old Sgt. Floyd Pepper hasn't gotten that many mentions. I love how much of an outright wisecracker he is, especially in the Raquel Welch episode, when Fozzie tries to change his attitude and personality.
Kermit: Way to go, that was very cute…sick but cute.
Floyd: Sick but cute? (Fozzie enters.)
Fozzie: Uh, you guys were talking about me, right?
Kermit: Uh no.
Floyd: Uh, YEAH! HAHAHAHAH!!!
(After Kermit is forced to cancel Fozzie's act, this exchange occurs…one of my all-time favorites.)
Fozzie: You see, that was my problem: my need to tell jokes.
Floyd: Yeah! That was OUR problem, too! AH-HAHAHAHAHAH!!! (exits)
And then there's the Carol Channing episode, when Miss Piggy has a hard time with her new shoes.
Floyd: Hey, Cinderella! Who sold you the slippers? A shoe salesman or a SAUSAGE STUFFER? AAAAHHHHH-HAHAHAHAHAHA!!!
Miss Piggy: Floyd dear, before you say anything more, why don't you jot down your next of kin? It'll be easier for the authorities.
(After Miss Piggy embarrasses herself in front of Kermit when he wants to see her in her shoes, Kermit exits for the next number.)
Kermit: Oh, the next number is on! It's one of my favorite songs!
Miss Piggy: What's that?
Floyd: "Your Feet's Too Big!" HAHAHAHAHAH!!!
Miss Piggy: HIIII-YAAA!!! (smacks Floyd and he falls)