John Voight (who used to own George’s car).
Man hands
Sal Bass.
–Cliffy
You realize, of course, that spelling Jon with an ‘H’ was the tipoff that George bought someone else’s car, don’t you?
Dr. Sitaredes, Pimple Popper M.D.!
Jackie Chiles (Kramer’s lawyer) *That’s totally inappropriate. It’s lewd, lascivious, salacious, outrageous! *
Mr. Peterman. “You may refer to it as Myanmar – to me it will always be Burma.” (or something.)
Assman!
Vegetable Lasagna
Elaine: He’s an idiot, he means nothing to me.
Vegetable Lasagna: I can hear you.
That would be Jean Paul Jean Paul.
Jerry’s female clone (the one he saves from the car and who he dates for a while). What was her name?
Jerry & Clone: “I HATE YOU!”
Lupe! “So that’s one ‘tuck’, and one ‘no tuck’.”
The Cleaning Lady: “You had sex on your desk with the cleaning lady.” “Was that wrong?”
Mr. Kruger, of Kruger Industrial Smoothing: “We don’t care, and it shows.”
Thank you.
What part of “one character per posting” was unclear in the OP? 
Barry the Chimpanzee that Kramer insults.
Quote: (water spitting at Kramer)
Mr. Marbles (is that you?)
Poppy, the guy who peed on the sofa.
**“Itza pizza the moment youa put your fist into-a the dough!!!” **
Does Rochelle count?
(shakey) The Mohel