Your favorite NON-recurring Seinfeld character...

[xx44]

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Elaine's dad was great, surprised nobody mentioned him.

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oh, [censored]! this guy is even better than bookman AINEC. "Pendant?! Those bastards!"

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Alton Benes.

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ALTON: All I have to do is stick my head out the window. (Waiter shows up with the drinks) Which one's suppose to be the funny guy?

GEORGE: (Pointing at Jerry) Oh, he's the comedian.

JERRY: I'm just a regular person.

GEORGE: No, no. He's just being modest.

ALTON: We had a funny guy with us in Korea. A tailgunner. They blew his brains out all over the Pacific. (Long pause) There's nothing funny about that.

[RickAstleyFan]

Poppi.

[CappyAA]

I know he was in 2 episodes, but was super minor in one episode:

Carl, the black exterminator that George calls to show the guy within the Yankees he's not racist.