I liked these main characters:Ann,Donald,Ann 's Parents(Lew and Helen Marie)Donald's Parents(Mr.and Mrs.Hollinger),Judy Bessemer and her husband Leon ,and Jerry Bauman and his wife Ruth.However,I did NOT like Ann's oh-so-stuffy and persnickety acting teacher Jules Benedict.As far as minor characters go,I did NOT like Hobart Niles in the first season episode "Beware of Actors Bearing Gifts",otherwise,a pretty good episode.What are your least favorite main and minor vcharacters on "That Girl?

I never liked Lou. He was annoying.

I can't stomach watching episodes with the acting teacher Jules Benedict. I loved Ann and Don of course. Noel Prince was another fave as well as Ethel Merman as herself. Her parents were great but I never missed them if they weren't in an episode.

It was a "crime" to let go of Judy, Leon and Ann's mom (in the final season). It was like Lou was married to the invisible woman.

And another minor(very minor)character I didn't care for was at the very beginning of the otherwise pretty good episode from early first season 1966 's "Rich Little Rich Kid",that very officious,not-very nice teller at the beginning of the episode.