Basically, this could be any character (https://tvtropes.org/pmwiki/pmwiki.php/Main/TheyWastedAPerfectlyGoodCharacter) that you personally enjoyed and brought a really interesting dynamic but were only around for a few appearances if not only a single season.

I thought that the Angie character on Gimme A Break was absolutely hilarious! She only appeared in six episodes.

i pick Leroy from the Jeffersons he made a few appearances and then disapperd

Julio from Sanford and son schould of stayed on longer