To make my list they had to appear in at least 5 episodes (sorry Babu). Ranked in order of my enjoyment, with my favorite quote(s) included for yours.
  1. David Puddy
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    Adore Patrick Warburton; his character is so dim yet so rich. I use his low, "yeah, that's right" reply with squinty eyes on my wife regularly, with "high five!" and "feels like an Arby's night" following behind closely. And anyone who gets to be in bed with JLD....😍
  2. J Peterman
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    The lines they blessed him with are tremendous, and he delivers them with such aplomb. My fave is "my neck is one gargantuan monkey fist!"
  3. Frank Costanza
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    Jerry Stiller belongs in the sitcom Hall of Fame. Creator of Festivus, belligerent computer salesman and ex-military cook, any time he combined with Kramer was gold, Jerry, GOLD! "Jerry, this is Frank Costanza, Mr. Steinbrenner is here, George is dead, call me back"
  4. Morty Seinfeld
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    #1 dad indeed. "MY WALLET'S GONE!!! MY WALLET'S GONE!!!"
  5. Estelle Costanza
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    Such a lovely screamer to match Frank. "I come home and find my son using his body like an amuuusement park!!!" "You're not giving away our Waterpik!!!"
  6. Jack Klompus
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    Morty Seinfeld's foil in the retirement community of Florida, had the astronaut pen "Take the pen!!" "What, you think I've never ridden in a Cadillac before??!"
  7. George Steinbrenner (Larry David)
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    Can't hear anything but LD's voice, the later the seasons got, the weirder the Steinbrenner quotes: "Is it Febuary or February? And what is this 'ru?'"
  8. Uncle Leo
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    "Jerry!! Hello!!"
  9. Kenny Bania
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    Struggling comic that looks up to Jerry and wants to be buds "That's gold, Jerry - GOLD!"
  10. Newman
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    Jerry's neighbor and nemesis. "All right! But hear me, and hear me well. The day will come–Oh, yes! Mark my words, Seinfeld! Your day of reckoning is coming when an evil wind will blow through your little play world and wipe that smug smile off your face! And I’ll be there, in all my glory, watching–watching as it all comes crumbling down!"
  11. Jackie Chiles
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    Kramers lawyer. So many to choose from - "So we got an attractive woman, wearing a bra, no top, walking around in broad daylight. She's flouting society's conventions!"
  12. Mickey
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    Kramer's acting buddy - my wife and I both use this one: "Cirrhosis of the liver with jaundice - jackpot!!"
  13. Mr. Lippman
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    Elaine's boss at Pendant Publishing that steals her idea of the Muffin Top store. "Elaine these ideas are all in the air - they're in the air!!"
  14. Tim Whatley
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    Love love love Bryan Cranston!! The dentist that Elaine dates briefly, his best line is ".....give me a schtickle of fluoride"
  15. Helen Seinfeld
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    Incredulous at the thought that anyone would have anything but super positive thoughts about her precious boy Jerry. "Yay! Jerry got it open!!"
  16. Mr. And Mrs. Ross
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    Such dour straight men to George's horrible relationship with Susan; she the alcoholic, he the closeted homosexual. Mrs. Ross "If I had a dime, for every for every book he's actually read *chuckle* I'd be broke". Mr. Ross "Turn this thing around, we've had it. We can't breathe back here!!"
  17. Justin Pitt
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    Elaine works as his personal assistant for a while. I, too, want to hold a line on a Macy's Thanksgiving Day Parade float, and long for a comfortable sock that will stay on my foot. "Next stop, Pottersville, next stop, Pottersville!"
  18. Mr. Wilhelm
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    Such a bumbling idiot, a great foil for George as his boss with the Yankees. "Most of the world is carpeted. And, one day, we will do the cleaning."
  19. Susan Ross
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    Annoying character, annoying actress, happy when she died. Not worthy of a quote. 👎🏻
  20. Crazy Joe Davola
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    "Hi Jerry" *shudder*